FORM 6 – K/A

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Private Issuer
Pursuant to Rule 13a – 16 or 15d – 16 of
the Securities Exchange Act of 1934

As of March 31, 2003

TUBES OF STEEL OF MEXICO, S.A.

(Translation of Registrant’s name into English)

TUBOS DE ACERO DE MEXICO, S.A.
Edificio Parque Reforma
Campos Eliseos #400
Mexico, D.F., 11560 Mexico
(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or 40-F.

Form 20-F þ Form 40-F o

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12G3-2(b) under the Securities Exchange Act of 1934.

Yes o No þ

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- .

TABLE OF CONTENTS


SIGNATURE

The attached material is being furnished to the Securities and Exchange Commission pursuant to Rule 13a-16 and Form 6-K under the Securities Exchange Act of 1934, as amended. This report contains Tubos de Acero de México, S.A.’s notice of extraordinary and ordinary general meeting of shareholders and proxy statement, as corrected, together with the 2002 annual report.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: April 9, 2003

JP MORGAN CHASE BANK

1 Chase Manhattan Plaza Floor 40

New York, N.Y. 10081

Re: TUBOS DE ACERO DE MEXICO, S.A.


To:	Registered Holders of American Depositary

Receipts for Shares of Common Stock,

No Par Value (“Common Stock”), of

Tubos de Acero de México, S.A.:

The Depositary is forwarding to holders of American Depositary Receipts the enclosed Notice of Extraordinary and Ordinary General Meeting of Shareholders and Proxy Statement of Tubos de Acero de México, S.A. (the “Company”) and is providing the enclosed form of Instructions pursuant to its obligation to make available to such holders information with respect to meetings of shareholders of the Company and to receive instructions from such holders as to the manner in which the voting rights pertaining to the Company’s shares of Common Stock represented by such Receipts should be exercised.

Holders of American Depositary Receipts of record as of March 28, 2003 desiring to instruct the Depositary as to the exercise of voting rights pertaining to the shares of Common Stock represented by such Receipts should complete, date and execute the enclosed form of Instructions and return it to the Depositary by 3:30 p.m., New York time, on April 25, 2003 in the accompanying return envelope, to which no postage need be affixed if mailed in the United States. Upon receipt of such Instructions, the Depositary, in cooperation with the Company, will vote the shares of Common Stock represented by such Receipts. In the absence of receiving such Instructions from the holder of an American Depositary Receipt, the Depositary shall deem the holder of such Receipt to have instructed the Depositary to give a discretionary proxy to a person designated by the Company to vote the shares of Common Stock represented by such Receipt.

Any holder of an American Depositary Receipt is entitled to revoke any Instructions previously given by such holder by filing with the Depositary a written revocation or duly executed Instructions bearing a later date at any time prior to 3:30 p.m., New York time, on April 25, 2003.

No Instructions or revocations or revisions thereof shall be accepted by the Depositary after 3:30 p.m., New York time, on April 25, 2003.


	JP MORGAN CHASE BANK
	*Depositary*

March 31, 2003

New York, New York

TUBOS DE ACERO DE MEXICO, S.A.

Km. 433.7 Carretera México-Jalapa-Veracruz,

Veracruz, México

Notice of Extraordinary and Ordinary General Meeting of Shareholders

to be held on April 30, 2003

By resolution of the Board of Directors of Tubos de Acero de México, S.A. (the “Company”), notice is hereby given to holders of shares of common stock of the Company that an Extraordinary and Ordinary General Meeting of Shareholders (the “Meeting”) will be held on April 30, 2003, at 10:30 a.m., at the Company’s Corporate domicile, Km. 433.7 Carretera México-Jalapa-Veracruz, Veracruz, México, and if a quorum shall not be available for the Meeting, a meeting with lower quorum requirements will be held on the same day at the same place at 11:00 a.m. The meeting will be conducted in two parts. During the Extraordinary portion of the Meeting, shareholders will vote with respect to the items listed below under the heading “Extraordinary”. Immediately thereafter, the Extraordinary portion of the Meeting will conclude and shareholders will vote with respect to the items listed below under the heading “Ordinary”.

Extraordinary


	1.	Cancellation of the listing of the Company’s securities on the Bolsa Mexicana de Valores (the Mexican Stock Exchange) and the American Stock Exchange, termination of the Company’s American Depositary Receipts Program and termination of the registration of the Company’s securities with the U.S. Securities and Exchange Commission as a result of the exchange offer by Tenaris S.A. consummated on December 17, 2002.

	2.	Reduction of the Company’s outstanding capital stock as a result of the cancellation of shares of the Company’s Common Stock and amendment to Article Six of the Company’s By-Laws to reflect such reduction.

	3.	Amendment to Article Two of the Company’s By-Laws to modify the Company’s corporate purpose.

	4.	Appointment of attorneys in fact to formalize the Minutes of the Meeting before a Notary Public.

Ordinary


	1.	Presentation of the reports from the Company’s Board of Directors and the Shareholders’ Examiner with respect to the operations and financial statements of the Company as of December 31, 2002 and 2001, and approval of such reports and such financial statements and of the allocations of profits for fiscal year 2002, including payment of a dividend in the amount of US$0.08748 per share equivalent to US$0.4374 per ADR and the creation of a reserve for future dividends.

	2.	Election of Directors, Shareholders’ Examiners and their Alternates; fixing of their fees for fiscal year 2002.

	3.	Presentation of the report from the Audit Committee in accordance with Article 14 Bis 3 of the Securities Market Law.

	4.	Approval of the fees paid to the Independent Accountants for fiscal year 2002 and appointment of the Independent Accountants for fiscal year 2003.

	5.	Appointment of attorneys in fact to formalize the Minutes of the Meeting before a Notary Public.

In order to attend the Meeting, shareholders must deposit their certificates representing shares of the Common Stock at the Company’s offices in México City, or at S.D. Indeval, S.A. de C.V., or with any banking institution in México or abroad, prior to 18:00 hours on April 25, 2003. If the deposit is made with a banking institution, evidence of such deposit must be delivered to the Company’s offices in México City not less than two days prior to the date set for the Meeting. Deposits made to participate in the Meeting shall also be valid to participate, if necessary, in the later meeting with lower quorum requirements.

Copies of the Proxy Statement furnished by the Company in connection with the Meeting may be obtained from JPMorgan Chase Bank, c/o Proxy Services Corporation, Distribution Center, Attn: Anthony Annucci 115, Amity Street, Jersey City, N.J. 07304.


	Félix Todd Piñero
	*Secretary of the Board of Directors*

March 31, 2003

Veracruz, Ver., México

TUBOS DE ACERO DE MEXICO, S.A.

Km. 433.7 Carretera México-Jalapa-Veracruz,

Veracruz, México

PROXY STATEMENT

Extraordinary and Ordinary General Meeting of Shareholders

to be held on April 30, 2003.

March 31, 2003

This Proxy Statement is furnished by Tubos de Acero de México, S.A. (the “Company”) in connection with the above-mentioned Meeting of Shareholders (the “Meeting”) to be held for the purposes set forth in the accompanying Notice of Meeting at the Company’s corporate domicile, Km. 433.7 Carretera México-Jalapa-Veracruz, Veracruz, México.

As of March 24, 2003, there were issued and outstanding 342,934,120 shares of Common Stock (no par value) (the “Common Stock”) of the Company, including 18,513,280 shares of Common Stock (the “Deposited Shares”) deposited with Banco Nacional de México, S.A., as agent for JPMorgan Chase Bank, the Depositary (the “Depositary”), under the Deposit Agreement, dated as of January 1, 1964, as subsequently amended and restated (the “Deposit Agreement”), among the Company, the Depositary and all holders from time to time of American Depositary Receipts (the “ADRs”) issued thereunder. The Deposited Shares are represented by American Depositary Shares (the “American Depositary Shares” or the “ADSs”) which are evidenced by the ADRs (one ADR equals five Shares).

Each holder of shares of Common Stock is entitled to one vote per share. Any holder of record of ADRs as of March 28, 2003 who desires to have the Deposited Shares with respect to its ADRs voted per such holder’s Instructions at the Meeting should complete, date, sign and return to the Depositary the enclosed form of Instructions by 3:30 p.m., New York time, on April 25, 2003. The Depositary, in cooperation with the Company, will thereupon vote such Deposited Shares. However, pursuant to Section 4.07 of the Deposit Agreement, if no instructions are received by the Depositary from any holder of ADRs by 3:30 p.m., New York time, on April 25, 2003, then the Depositary shall deem such holder to have instructed the Depositary to give a discretionary proxy to a person designated by the Company to vote the Deposited Shares corresponding to his ADRs. Any holder of ADRs is entitled to revoke any Instructions which it has previously given by filing with the Depositary a written revocation or duly executed Instructions bearing a later date at any time prior to 3:30 p.m., New York time, on April 25, 2003. No Instructions or revocations or revisions thereof shall be accepted by the Depositary after 3:30 p.m., New York time, on April 25, 2003.

CANCELLATION OF THE LISTING OF THE COMPANY’S SECURITIES ON THE BOLSA MEXICANA DE VALORES AND THE AMERICAN STOCK EXCHANGE, TERMINATION OF THE COMPANY’S AMERICAN DEPOSITARY RECEIPTS PROGRAM AND TERMINATION OF THE REGISTRATION OF THE COMPANY’S SECURITIES WITH THE U.S. SECURITIES AND EXCHANGE COMMISSION

As a result of an exchange offer consummated on December 17, 2002, Tenaris S.A. (“Tenaris”) holds directly or indirectly 94.50% of the total outstanding capital stock of the Company. Accordingly, Tamsa no longer continues to meet the listing criteria of the Bolsa Mexicana de Valores and therefore is required to terminate the listing of its shares on such market.

In addition, in order to continue the integration and consolidation process of Tamsa into Tenaris that began with the corporate reorganization of Tenaris and its subsidiaries, including the Company, completed on October 18, 2002, and the exchange offer consummated on December 17, 2002, Tenaris has requested that each of the American Depositary Receipts (ADR) Program of the Company, the listing of the Company’s American Depositary Securities (ADSs) on the American Stock Exchange and the registration of the Company’s securities with the U.S. Securities and Exchange Commission be terminated as soon as practicable in accordance with applicable law. Tenaris has also informed the Company that, subject to obtaining any requisite regulatory approvals, it intends to make a second exchange offer that would allow the remaining public shareholders of the Company to exchange their shares and ADSs for shares and ADSs of Tenaris.

The delisting procedures will be conducted in accordance with the laws and regulations applicable in the respective markets.

The Board of Directors recommends a vote FOR approval to delist the shares of the Company from the Mexican Stock Exchange, to terminate the Company’s ADR Program, to delist the Company’s ADSs from the American Stock Exchange and to terminate the registration of the Company’s securities with the U.S. Securities and Exchange Commission, in each as soon as practicable in accordance with applicable law.

CANCELLATION OF THE COMPANY’S SHARES AND CONSEQUENT REDUCTION OF THE

COMPANY’S OUTSTANDING CAPITAL STOCK AND

AMENDMENT TO THE COMPANY’S BY-LAWS

On December 16, 2002, Tamsider, S.A. de C.V., a wholly owned subsidiary of the Company, reduced its capital stock. As a consequence, the Company received as payment 3,650,000 shares of the Company’s Common Stock. The Board of Directors determined that these shares would not be re-offered for sale to public investors, and therefore such shares were cancelled as required by applicable law. Consequently, the Board of Directors recommends a reduction of the Company’s capital stock by 3,650,000 shares.

The Company further proposes that, at the Extraordinary portion of the Meeting, shareholders amend the Company’s By-Laws (Estatutos Sociales).

Following is a translation of proposed Article Six of the amended By-Laws:

“ARTICLE SIX.- The paid-in capital stock is the amount of Ps.$1,182,500,160 and it is represented by one sole Series consisting of 339,284,120 shares. All shares are common, without any par value, are fully subscribed and paid, are in book-entry form and grant their holders the same rights and obligations.”

The Board of Directors recommends a vote FOR approval.

AMENDMENT TO ARTICLE TWO OF THE COMPANY’S BY-LAWS

As a result of the exchange offer consummated on December 17, 2002, the Company is now a 94.50% subsidiary of Tenaris and as such in a position to benefit from group synergies. While other subsidiaries of Tenaris are in a position to guarantee the obligations of the Company, the Company’s current By-Laws only allow it to guarantee the obligations of companies where the Company holds equity interest, but not of other subsidiaries of Tenaris. Accordingly, it is in the best interest of the Company to amend its By-laws to allow it to guarantee obligations of other companies controlled by Tenaris.

Following is a translation of proposed Article Two, section IX of the amended By-Laws.

“IX. To guarantee by any means, including aval and bonds any debts and obligations of companies controlled directly or indirectly by Tenaris, S.A. and to provide such guarantees jointly and severally or severally.”

Because it believes the proposed amendments to the By-Laws are in the best interests of the Company and its stockholders, the Board of Directors recommends a vote FOR this proposal.

APPROVAL OF THE COMPANY’S FINANCIAL STATEMENTS AND

APPROVAL OF A DIVIDEND PAYMENT

On June 14, 2002, following the approval of the Company’s audited financial statements for the year ended December 31, 2001 by the Company’s shareholders meeting, the Company’s independent accountants removed the qualification with respect to the value of the Company’s investment in Consorcio Siderurgia Amazonia Ltd. (the “Amazonia Consortium”) and the recoverability of indebtedness owed to the Company by the Amazonia Consortium. Accordingly, the Company’s audited financial statements for the year ended December 31, 2001, as restated, are submitted to the shareholders meeting for approval.

The Board of Directors recommends a vote FOR approval of the Company’s Financial Statements as of December 31, 2001 and 2002, to be submitted at the Meeting and made available to shareholders as set forth in the accompanying Notice of Meeting. Under Mexican law, the Company’s Financial Statements must be submitted to shareholders at the Meeting for discussion, approval or, if appropriate, amendment. The approval of the Financial Statements by the shareholders does not affect or limit the Company’s responsibility to present the Financial Statements fairly. The Consolidated Statements of Financial Position of the Company and its Subsidiaries for the years ended December 31, 2002 and 2001, the related Consolidated Statements

of Earnings, Consolidated Statements of Changes in Financial Position, the related Notes to Consolidated Financial Statements, the Auditors’ Report on such Financial Statements and Management’s Discussion and Analysis of Results of Operations and Financial Condition are included in the Company’s 2002 Annual Report, a copy of which is enclosed herewith.

The Board of Directors further recommends a vote FOR approval of a dividend in the amount of US$29,680,575 (to be declared in U.S. dollars and equivalent to Mexican pesos 328,219,671 at the February 27, 2003 exchange rate of Mexican pesos 11.0584 per U.S. dollar as published in the Official Gazette of the Federation), or US$0.08748 per share equivalent to US$0.4374 per ADR currently issued and outstanding, from the Company’s retained earnings of Mexican pesos 14,426,711,000. Upon approval of this resolution, the Board of Directors shall determine, in its discretion, the terms and conditions of the dividend payments, including the record date. Until payment, this amount shall remain in the retained earnings account.

Additionally, the Board recommends a vote FOR approval for the creation of a reserve of US$70,000,000.00 from the Company’s retained earnings for the payment of future dividends. Upon approval the Board of Directors will have the authority to determine, the amounts, dates, terms and conditions for this dividend payment.

ELECTION OF DIRECTORS AND SHAREHOLDERS’ EXAMINERS,

FIXING OF THEIR FEES FOR THE FISCAL YEAR 2002

The Company’s By-Laws (Estatutos Sociales) provide for the annual election by the holders of Common Stock of a Board of Directors of not less than five persons and of an Alternate for each Director. The function of an Alternate Director is to attend and vote at Directors’ Meetings in place of the Director for which he is the Alternate in the event such Director is unable to attend. The Articles of Incorporation also provide for the annual election at the Meeting of one or more Examiners and Alternate Shareholders’ Examiners. The Shareholders’ Examiners participate in the meetings of the Board of Directors of the Company without the right to vote, observe the conduct of the operations of the Company on behalf of the shareholders and report to the shareholders annually. Under Mexican law, Directors and Shareholders’ Examiners and their Alternates may only be nominated and elected by the Shareholders at the Meeting.

The present Board of Directors of the Company is composed of 11 Directors and their respective Alternates and one Shareholders’ Examiner and his respective Alternate. The Board of Directors of the Company recommends to reduce the number of Directors to 8 and recommends a vote FOR the following persons as Directors and Shareholders’ Examiner and their respective Alternates:


Directors		Alternates

Paolo Rocca		Cecilia Bilesio
Guillermo F. Vogel		Javier Pérez Rocha
Vincenzo Crapanzano		Gerardo Varela
Roberto Einaudi		Fernando R. Mantilla
Adalberto Cortesi		Alejandro Cervantes Riba
Gianfelice Rocca		Roberto Altamura
Luiz Alberto Aziz		Hernando Sabau García
Carlos Abedrop		Emilio Paulon G.





Shareholders’ Examiner		Alternate

Enrique Osorno Heinze		Juan Manuel Cárdenas López

If any of such persons should not be nominated or refuse nomination or be unavailable for election, the Depositary shall deem the holders of ADRs to have instructed the Depositary to give a discretionary proxy to a person designated by the Company to vote the shares Common Stock represented by such ADR. Each Director, Shareholders’ Examiner and Alternate Director or Alternate Shareholders’ Examiner elected will hold office until the next annual Ordinary General Meeting of Shareholders and until his successor is appointed and qualifies. In case of death, incapacity, resignation or removal of a Director, his Alternate will hold his office until the next annual Ordinary General Meeting of Shareholders.

Background

All of the Directors and the Shareholders’ Examiners recommended by the Board of Directors of the Company are candidates proposed by Tenaris.

The Board of Directors of the Company met five times during 2002. On May 10, 2002 by resolution of the Board of Directors, an Audit Committee was created. Besides this Audit Committee, the Board of Directors has no executive, nominating or compensation committee, or any committees exercising similar functions.

Management

Certain information with respect to the present Officers, Directors and Shareholders’ Examiners, and their respective Alternates, is given below.


				Director
				or
		Officer		Alternate
Name	Position with the Company	Since		Since

Paolo Rocca	Director and Chairman of the Board of Directors				1993




Adalberto Cortesi	Director and Vice Chairman of the Board of Directors				1993




Guillermo F. Vogel	Director and Vice Chairman of the Board of Directors		1983		1984




Vincenzo Crapanzano	Director and Executive Vice President and Director Managing		2000		2000




Carlos Abedrop	Director				1981




Luis Betnaza	Director				1995




Roberto Einaudi	Director				1952




Mario Laborín Gómez	Director				2001




Gianfelice Rocca	Director				1983




José Luis Romero Hicks	Director				2001




Gerardo Varela	Alternate Director and Chief Financial Officer		1992		1999




Adrián Rojí	Alternate Director		1976		2000




Roberto Altamura	Alternate Director				1993




Luis Alberto Aziz	Alternate Director				1997




Mario Bonechi	Alternate Director				1994




Alejandro Cervantes Riba	Alternate Director				1993




Abel Jacinto	Alternate Director				2000




Fernando Mantilla	Alternate Director				1993




Emilio Paulon G	Alternate Director				1981




Javier Pérez Rocha	Alternate Director				1988




Federico Patiño Márquez	Alternate Director				2002




Félix Todd Piñero	Secretary of the Board of Directors and Legal Director		1993




Francisco J. Muñoz	Assistant Secretary of the Board of Directors		2001




Cecilia Bilesio	Corporate Affairs Director		1996




Emilio Cerri	Service and Maintenance Manager		1993




Sergio de la Maza	Domestic Sales Director		2001




Claudio Gugliuzza	Administrative Director		1999




Gustavo Kehr	Director of Operations		1999




Marcelo de Virgiliis	Export Sales Director		2002




Héctor Quintanilla	Quality Director		1995




Julio Eduardo Stulich	Sales Operations Manager		2000




Roberto Vilate	Technical Director		2000




Enrique Osorno Heinze	Shareholders’ Examiner		1999




Juan Manuel Cárdenas L	Alternate Shareholders’ Examiner		2002

Compensation

The aggregate compensation paid by the Company during 2002 to all Directors, Alternate Directors and Executive Officers (including the Secretary and the Assistant Secretary of the Board) as

a group was Mexican pesos 63,126,081.19. No remuneration was paid to the Shareholders’ Examiner or his Alternate during the period.

REPORT FROM THE AUDIT COMMITTEE

On May 10, 2002 an Audit Committee was created in accordance with the Mexican Securities Law. The Audit Committee is comprised of three members of the Board of Directors (Luis Aziz – Chairman-, Emilio Paulon G. and Gerardo Varela), the majority of which, including the chairman, are independent Directors. The Shareholders’ Examiners must attend as guests, with the right to express their opinion but without the right to vote. The Audit Committee is required to issue a report to be submitted to the general shareholders meeting.

APPOINTMENT OF INDEPENDENT ACCOUNTANTS

It is proposed that PricewaterhouseCoopers be reappointed as Independent Accountants of the Company. This firm, as Independent Accountants of the Company for fiscal year 2002, received a fee of Mexican pesos 1,910,000 for services rendered during such period. The Board of Directors of the Company recommends a vote FOR approval of the fee paid to PricewaterhouseCoopers in 2002 and the reappointment of PricewaterhouseCoopers as independent accountants of the Company in 2003.

QUORUM AND VOTE REQUIRED FOR APPROVAL

Extraordinary and Ordinary General Meeting:

The quorum required for the Extraordinary portion of the Meeting, called for 10:30 a.m on April 30, 2003, will be 75% of the outstanding shares of Common Stock, but if no quorum for the Extraordinary portion is available, a second meeting will be held one-half hour later on the same day and at such second meeting the quorum required will be 50%. The affirmative vote of at least 50% of the outstanding Common Stock is required for approval of the matter to be voted upon at the Extraordinary portion of the Meeting. The quorum required for the Ordinary Portion of the Meeting to be held immediately after the Extraordinary portion of the Meeting, will be 50% of the outstanding shares of Common Stock, but if no quorum for the Ordinary portion is available, a second meeting will be held one-half hour later on the same day with no minimum quorum requirements. The affirmative vote of a majority of the outstanding Common Stock represented at the Ordinary portion of the Meeting is required for approval of each of the matters to be voted upon.

OTHER MATTERS

Management is not aware of any matters which may properly come before the Meeting other than those outlined in the accompanying Notice of Meeting or relating thereto. However, should any such matters properly come before the Meeting, the Company understands that it is the intention of the Depositary to vote the enclosed Instructions in accordance with its judgment on such matters.

The Company will bear the cost of solicitation of Instructions. In addition to the use of the mail, Instructions may be solicited by officers and regular employees of the Company, personally, by telephone or telegraph, and the Company may reimburse persons holding ADRs in their names or those of their nominees for their expenses in sending soliciting material to their principals.

The Company anticipates that the next Ordinary General Meeting of Shareholders will be held on or about April 30, 2004. The exact date, time and place for such Meeting has not yet been determined. A shareholder who intends to present a proposal at the next Ordinary General Meeting must submit the written text of the proposal to the Company no later than March 14, 2004, in order for the proposal to be considered for inclusion in the Company’s Proxy Statement for that meeting.

PricewaterhouseCoopers are the Independent Accountants of the Company. They will have a representative present at the Meeting who will have an opportunity to make a statement, if he or she desires to do so, and to respond to appropriate questions.

By Resolution of the Board of Directors

Félix Todd Piñero

Secretary of the Board of Directors

(TenarisTamsa)

2002 ANNUAL REPORT

Company Profile

Tubos de Acero de México, S.A. (Tamsa) is a global leader in seamless steel pipe products and services.

The Company’s primary products are Oil Country Tubular Goods (OCTG) and line pipe, which are used in various phases of oil and gas production and transportation. OCTG includes casing — used to support the walls of oil and gas wells during and after drilling —, and tubing — which is used to extract crude oil and gas after drilling is completed ––. Line pipe transports crude oil and natural gas from the wells to refineries, storage tanks and loading and distribution centers. In addition, Tamsa provides comprehensive design, engineering, testing and project management support to its international client base.

Tamsa’s products are manufactured in a wide variety of specifications to meet clients’ requirements for steel grades, wall thicknesses, diameters, lengths and connections.

The Company also manufactures weldable pipe fittings, cold-drawn pipe and other mechanical and structural seamless pipe for industrial usage.

With sales to more than 60 countries and a dominant home market position as Mexico’s sole producer of seamless steel pipe, Tamsa continues to invest in research and development (R&D), automation and capacity expansion in order to broaden the Company’s product range, generate efficiency gains, exploit new opportunities in value-added products, and enhance and streamline services. Tamsa recorded revenues of approximately US$680 million in 2002.

Tamsa is a member of the Tenaris, which has manufacturing facilities in Argentina, Brazil, Canada, Italy, Japan, Mexico and Venezuela and a network of customer service centers present in over 20 countries worldwide, Tenaris is a leading global manufacturer of seamless steel pipes and provider of pipe handling, stocking and distribution services to the oil and gas, energy and mechanical industries as well as a leading regional supplier of welded steel pipes for gas pipelines in South America.

TUBOS DE ACERO DE MÉXICO, S.A. AND SUBSIDIARIES

TABLE OF CONTENTS


	Page

LETTER TO SHAREHOLDERS		3
KEY FINANCIAL / OPERATING FIGURES		5
STATISTICAL DATA		6
SELECTED FINANCIAL DATA		7
BOARD OF DIRECTORS AND EXECUTIVE OFFICERS		8
MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULT OF OPERATIONS		9
CONSOLIDATED FINANCIAL STATEMENTS AND STATUTORY AUDITOR’S REPORT		F-1

(This page intentionally left blank)

Letter to Our Shareholders

Tamsa will always look back on 2002 as a tremendously important year in its history. Through a public share exchange offer that involved our company as well as Siderca and Dalmine, on December 16, 2002, Tenaris was born. The new company will be listed on the Mexican Stock Exchange as well as in Buenos Aires and Milan, and its ADS will be traded on the New York Stock Exchange. Today, Tenaris represents a global reality, bringing together numerous industrial and commercial operations, and standing at the forefront of the international market for steel tubes and related services. As a result of the enthusiastic response to its exchange offering, Tenaris now owns 94.50% of Tamsa’s capital stock.

I want to especially thank those who have been Tamsa shareholders from the start, for the support and confidence they have shown in our company over the years. This support has enabled us to advance with extraordinary vigor in Mexico and abroad. The Tamsa shareholders that have further expressed their confidence by choosing to be shareholders of Tenaris can look toward the future with the certainty that they have helped to build a financially solid organization, with integrated global operations, and with the capacity to continually offer innovative products and services.

With a 50-year history, and exports to more than 60 countries since the mid-1980s — thanks to strong investment in the multi-stand pipe mill and the melt shop, which doubled output and production capacity — we continue to globalize our productive and commercial base. Starting from the alliance with Siderca (Argentina) in 1993 and with Dalmine (Italy) in 1996, and continuing with the incorporation of Tavsa (Venezuela) in 1998, NKKTubes (Japan) and AlgomaTubes (Canada) in 2000, Tamsa became the international leader in the production of seamless steel tubes. In 1998, Confab (Brazil) and Siat (Argentina) joined the alliance, broadening our range of products with the inclusion of two seamless steel tube manufacturers. In 2001, we launched the Tenaris brand, which joins together all these industrial assets plus the international commercial network that serves them: Tenaris Global Services. From our starting point in Mexico, after considerable investment and inspired by our confidence in this country, we have earned the recognition of clients around the world for the quality of our products and services.

In 2002, our net sales fell 2.5% to Ps6,728 million, and total sales volume declined 6.5% to 685,248 metric tons, due primarily to an 8.3% reduction in export sales volume, a 49.1% decline at Tavsa, and a 4.5% drop in the domestic market for non-OCTG, offset in part by a 22.8% growth of the domestic market for oil pipe. Increased demand from Pemex operations in northern and southern Mexico was the main reason for this growth. Pipe demand in northern Mexico, in connection with Pemex’s Strategic Natural Gas Program, remained stable during the year because Pemex held gas output quotas steady in order to meet domestic demand. In the southern region, demand for pipes rose primarily because of increased investment in exploration and production activity.

The drop in sales volume to domestic non-OCTG clients was the result of a downturn in industrial production in the Mexican economy throughout most of the year, combined with the sluggish recovery of the U.S. economy, which affected the automotive and industrial sectors. The 8.3% annual reduction in sales volume is attributed to lower drilling activity in Latin America (mainly Venezuela), Europe and Canada, offset partly by greater activity in the Middle East and Africa, where in fact sales rose. The 49.1% reduction in sales volume at Tavsa was due to a reduction in demand from PDVSA and decreased exploration and production activity in the Venezuelan oil sector, in turn the result of adverse economic and political conditions in that country.

Tamsa operated at capacity utilization levels of more than 80% in its plants, and exports accounted for 71% of its sales, proving its capacity to compete in the most demanding international markets. This brought our operating margin to 20.7%, EBITDA to Ps1,864 million (a margin of 27.7%) and net earnings of Ps1,136 million (a net margin of 16.9%).

Despite the Mexican economy’s lack of vigor during the year, we redoubled our commitment to supporting the community in Veracruz, which is home to our industrial facilities. We participated through contributions to schools, libraries and scholarship funds, and helped build public works for the region’s poorer communities.

I would also like to express my deep gratitude to our employees, whose dedication and professionalism throughout even the most difficult moments allowed us to continue bringing in excellent results, and to stay on the path to growth on a global level.

To our shareholders, I am pleased to announce that for the sixth year in a row the Board of Directors has proposed a dividend payment to its stockholders, amounting to US$0.08748 per share, or US$0.4374 per ADR (one ADR = five shares).

Thus, despite the restrictive economic climate prevailing today in Mexico, we believe that through Tenaris, we are better positioned to continue investing in this country and to maintain our position as leading producers and exporters.

Sincerely,

Paolo Rocca

Chairman of the Board of Directors

Veracruz, Mexico

March 2003

Key Financial / Operating Figures*

Tubos de Acero de México, S.A. and Subsidiaries


Year-end data	2002		2001

Net sales		6,728,275		6,899,027
Operating profit		1,391,223		1,542,785
Operating profit plus depreciation and amortization (EBITDA)		1,863,820		1,951,555
Income before taxes, employees’ statutory profit sharing, equity in associated companies and extraordinary item		1,212,184		1,473,845
Net income for the year		1,136,023		578,638
Earnings per share**		3.35		1.71
Earnings per ADS**		16.75		8.55
Weighted average number of shares outstanding**		339,284,120		339,284,120
Total assets		14,320,112		12,578,283
Total financial debt		1,723,219		1,608,970
Total liabilities***		5,369,728		4,949,637
Capital stock		10,694,466		10,694,466
Total shareholders’ equity		8,951,384		7,628,646


*	Peso amounts are expressed in thousands of constant Mexican pesos with purchasing power as of December 31, 2002, except outstanding shares and per share and ADR amounts.

**	On July 10, 2001, the Company made a stock-split at a ratio of five new shares to one share of the 1999 issue; and modified the ADR ratio to one ADR for five new shares. See note 5 to Tamsa’s annual financial statements.

***	Includes a deferred tax liability of Ps.2,171,121 in 2002 and Ps.2,154,157 in 2001 resulting from the adoption of Statement D-4 (Deferred income tax) under Mexican GAAP, which became effective on January 1, 2000.

Sales Volume

Pipe products

Sales to

Pemex

other

and drilling

domestic

Total pipe

companies

customers

Export sales

Tavsa

Riga

sales

% of

Metric

total

Metric

total

Metric

total

Metric

total

Metric

total

Metric

total

tons

vol.

tons

vol.

tons

vol.

tons

vol.

tons

vol.

tons

vol.

2002

101,364

14.8%

53,633

7.8%

488,986

71.4%

21,188

3.1%

8,164

1.2%

673,335

98.3%

2001

82,546

11.3%

56,179

7.6%

533,471

72.8%

41,658

5.7%

6,189

0.8%

720,043

98.2%

% of change

22.8%

– 4.5%

– 8.3%

– 49.1%

31.9%

– 6.5%

[Additional columns below]

[Continued from above table, first column(s) repeated]

Other

products

Total

% of

Metric

total

Metric

tons

vol.

tons

2002

11,913

1.7%

685,248

2001

12,902

1.8%

732,945

% of change

– 7.7%

– 6.5%

Statistical Data

(BAR CHARTS)

Selected Financial Data

(Thousands of Mexican pesos with purchasing power as of December 31, 2002 except outstanding shares and per share amounts.)


Year-end data	2002			2001			2000			1999			1998

Income statement data:
Net sales		6,728,275			6,899,027			6,463,007			5,103,316			8,269,197
Operating costs and expenses		(5,337,052	)		(5,356,242	)		(5,406,737	)		(4,542,881	)		(5,863,429	)
Operating profit		1,391,223			1,542,785			1,056,270			560,435			2,405,768
Comprehensive financing (cost) income		(165,924	)		(42,106	)		(88,544	)		(146,049	)		(489,759	)
Gain on sale of subsidiary⁽¹⁾		–			–			–			–			527,451
Income before taxes, employees’ statutory profit sharing, equity in associated companies and extraordinary item		1,212,184			1,473,845			957,847			428,372			2,453,957
Income tax, asset tax and employees’ statutory profit sharing		(60,114	)		(592,710	)		(483,763	)		(407,282	)		(826,677	)
Equity in loss of associated companies⁽²⁾		(16,047	)		(290,930	)		(52,608	)		(379,135	)		(233,420	)
Net income (loss) for the year		1,136,023			578,638			421,496			(92,871	)		1,957,987
Weighted average number of common shares outstanding⁽³⁾		339,284,120			339,284,120			339,284,120			339,409,820			345,467,065
Earnings (loss) per share		3.35			1.71			1.24			(0.27	)		5.67
Balance sheet data:
Working capital		3,167,509			2,712,465			2,523,247			1,710,979			2,731,097
Total assets		14,320,112			12,578,283			12,804,185			13,127,508			16,324,148
Long-term debt		683,203			1,361,585			1,056,344			–			666,158
Shareholders’ equity		8,951,384			7,628,646			7,786,771			10,693,199			12,822,880


(1)	Income from the sale of TF de México, S.A. de C.V., a subsidiary of the Company.

(2)	Mainly corresponding to Tamsa’s equity participation in Consorcio Siderurgia Amazonia, Ltd. See Note 11 to the Consolidated Financial Statements.

(3)	Amounts exclude 3,650,000 shares for 1998, 1999, 2000 and 2001 held since November 30, 1988 by a wholly-owned subsidiary of Tamsa. As of June 16, 1993, an additional 66,978,000 shares of common stock were issued and paid in. On November 1, 1991, 35,000,000 shares of common stock were issued. During 1997, 7,982,910 of these shares were converted, and the remaining 27,017,090 shares were canceled. Additionally, 351,790 shares and 1,001,790 shares held in treasury were canceled during 1997 and 1998, respectively. Tamsa purchased 10,100,000 shares which were canceled on April 28, 1999. On July 10, 2001, each outstanding share of Tamsa’s common stock was split into five shares; concurrently, the ADR ratio was modified from one ADR for each share of common stock to one ADR for five shares of common stock. For comparative purposes, the number of shares shown for prior years has been adjusted to reflect the split retroactively. See note 5 to Tamsa’s consolidated financial statements.

Board of Directors


Paolo Rocca		Chairman of the Board
Adalberto Cortesi		Vice Chairman of the Board
Guillermo F. Vogel		Vice Chairman of the Board
Carlos Abedrop		Director
Luis Betnaza		Director
Adalberto Cortesi		Director
Vincenzo Crapanzano		Director
Roberto Einaudi		Director
Mario Laborín Gómez		Director
Gianfelice Rocca		Director
Paolo Rocca		Director
José Luis Romero Hicks		Director
Guillermo F. Vogel		Director
Emilio Paulon		Alternate Director
Gerardo Varela		Alternate Director
Alejandro Cervantes Riba		Alternate Director
Adrián Rojí		Alternate Director
Mario Bonechi		Alternate Director
Federico Patiño Márquez		Alternate Director
Roberto Altamura		Alternate Director
Fernando Mantilla		Alternate Director
Abel Jacinto		Alternate Director
Javier Pérez Rocha		Alternate Director
Luis Alberto Aziz		Alternate Director
Enrique Osorno Heinze		Shareholders’ Examiner
Juan Manuel Cárdenas López		Alternate Shareholders’ Examiner
Félix Todd Piñero		Secretary of the Board
Francisco J. Muñoz		Assistant Secretary of the Board
Independent Accountants		PricewaterhouseCoopers

Executive Officers


Vincenzo Crapanzano		Executive Vice President and Managing Director
Cecilia Bilesio		Corporate Affairs Director
Sergio de la Maza		Domestic Sales Director
Marcelo de Virgiliis		Export Sales Director
Claudio Gugliuzza		Administrative Director
Gustavo Kehr		Director of Operations
Héctor Quintanilla		Quality Director
Julio Eduardo Stulich		Sales Operations Manager
Félix Todd Piñero		Legal Director
Gerardo Varela		Chief Financial Officer
Roberto Vilate		Technical Director

Management’s Discussion and Analysis of Financial Condition and Result of Operations

The following discussion should be read in conjunction with the audited consolidated financial statements and the notes thereto included in this annual report of Tubos de Acero de México, S.A. (Tamsa). Tamsa prepares its financial statements in conformity with generally accepted accounting principles in Mexico, commonly referred to as “Mexican GAAP.” Mexican GAAP differ in some important respects from U.S. GAAP. See note 12 to Tamsa’s audited consolidated financial statements included in this annual report for a description of the principal differences between Mexican GAAP and U.S. GAAP as they relate to Tamsa and for a reconciliation of net income and total shareholders’ equity for the periods and at the dates indicated. Mexican GAAP require that these consolidated financial statements recognize certain effects of inflation in accordance with Bulletin B-10 and its amendments. Unless otherwise noted, all data in the audited consolidated financial statements and the financial information derived therefrom included in this discussion and all other Tamsa financial data included throughout this annual report and relating to the dates or periods covered by the financial statements have been restated in constant Mexican pesos as of December 31, 2002. From January 1, 2002 to December 31, 2002, the rate of inflation (based on the Mexican Consumer Price Index) was 5.7 percent.

Results of operations

The table below sets forth, for the periods indicated, selected financial data from Tamsa’s income statements.



	For the year ended December 31,

	2002			2001


(Thousands of constant December 31, 2002 Mexican pesos, except share and per share amounts)
Net sales		Ps6,728,275			Ps6,899,027
Operating cost and expenses:
Cost of products sold		(4,145,970	)		(4,067,468	)
Selling, general and administrative expenses		(1,191,082	)		(1,288,774	)

Total operating cost and expenses		(5,337,052	)		(5,356,242	)
Operating profit		1,391,223			1,542,785
Comprehensive financing cost		(165,924	)		(42,106	)
Other expenses — net⁽¹⁾		(13,115	)		(26,834	)
Income before taxes, employees’ statutory profit sharing, equity in associated companies and extraordinary item		1,212,184			1,473,845
Income tax, asset tax and employees’ statutory profit sharing		(60,114	)		(592,710	)
Equity in loss of associated companies⁽²⁾		(16,047	)		(290,930	)
Cumulative effect of change in accounting principle⁽³⁾		—			(11,567	)

Net income		1,136,023			578,638
Weighted average number of shares outstanding⁽⁴⁾		339,284,120			339,284,120
Earnings per share		3.35			1.71


(1)	Includes the amortization of Tubos de Acero de Venezuela, S.A.’s (Tavsa) and Empresas Riga S.A. de C.V’s (Riga) goodwill.

(2)	Mainly corresponding to Tamsa’s equity participation in Consorcio Siderurgia Amazonia Ltd. (Amazonia). See note 11 to Tamsa’s audited consolidated financial statements.

(3)	Corresponds to the net effect at the beginning of the year from changes in the accounting principles, as a result of the adoption of Statement C-2, effective January 1, 2001, which establishes the accounting treatment for derivatives and financial instruments.

(4)	Amounts exclude 3,650,000 shares for 2002 and 2001 held since November 30, 1988 by a wholly-owned subsidiary of Tamsa. On July 10, 2001, each outstanding share of Tamsa’s common stock was split into five shares; concurrently, the ADR ratio was modified from one ADR for each share of common stock to one ADR for five shares of common stock. For comparative purposes, the number of shares shown for prior years has been adjusted to reflect the split retroactively. See note 5 to Tamsa’s audited consolidated financial statements.

The following table sets forth Tamsa’s operating and other costs and expenses as a percentage of net sales for the periods indicated.



	For the year ended December 31,

	2002			2001


	Percentage of net sales
Net sales		100			100
Operating cost and expenses:
Cost of products sold		(62	)		(59	)
Selling, general and administrative expenses		(18	)		(19	)

Total operating cost and expenses		(80	)		(78	)
Operating profit		20			22
Comprehensive financing cost		(2	)		(1	)
Other expenses – net⁽¹⁾		—			—

Income before taxes, employees’ statutory profit sharing, equity in associated companies and extraordinary item		18			21
Income tax, asset tax and employees’ statutory profit sharing		(1	)		(8	)
Equity in loss of associated companies⁽²⁾		–			(5	)
Cumulative effect of change in accounting principle⁽³⁾		—			—

Net income		17			8

Year Ended December 31, 2002 Compared to Year Ended December 31, 2001

Sales volume

Total sales volume in 2002 decreased 6.5% to 685,248 tons, from 732,945 tons in 2001. This decrease was mainly due to an 8.3% reduction in export sales volume, a 49.1% drop in Tubos de Acero de Venezuela’s (Tavsa) sales volume and a 4.5% decrease in the sales volume from the non-oil domestic market, partially offset by a 22.8% increase in the domestic petroleum market. Domestic sales volume to oil-related customers totaled 101,364 tons in 2002, compared to 82,546 tons in 2001. This growth in sales during 2002 was due to higher demand from Petróleos Mexicanos (Pemex) in both the Northern and Southern regions of Mexico. Demand from the Northern region, which is related to Pemex’s strategic natural gas program, remained firm during the year due to Pemex’s needs to maintain its gas production quota in order to satisfy domestic demand. Demand from the Southern region increased mainly as a result of higher exploration and production spending in the region. Domestic sales volume to non-oil related customers totaled 53,633 tons in 2002, compared to 56,179 tons during 2001. This decrease was due to the contraction of industrial production in the Mexican economy throughout most of the year, coupled with a slow recovery in the U.S. economy, affecting the automotive and industrial sectors.

Export sales volume in 2002 totaled 488,986 tons, compared to 533,471 tons — a record in 2001 —. This 8.3% decrease was due to lower international drilling activity in Latin America — mainly in Venezuela —, Europe and Canada, partially offset by higher activity in the Middle East and Africa resulting in increased sales to those regions.

Tavsa’s sales volume totaled 21,188 tons in 2002, compared to 41,658 tons in 2001. This 49.1% decrease was the result of lower demand by PDVSA and reduced exploration and production activities in the oil sector in Venezuela as a result of adverse economic and political conditions. Riga’s sales volume totaled 8,164 tons in 2002, compared to 6,189 tons in 2001. This 31.9% increase was attributable to Tamsa’s acquisition of Riga on June 20, 2001.

Sales volume of steel bars decreased 7.7% to 11,913 tons during 2002, compared to 12,902 tons in 2001.

Net sales

Net sales during 2002 were Ps6,728,275 thousand, compared to Ps6,899,027 thousand in 2001. This 2.5% decrease in net sales was attributable to lower sales volume, mainly in the export market, at Tavsa and in the non-oil domestic market, partially offset by higher sales in the domestic petroleum market.

Cost of products sold

Cost of products sold, expressed as a percentage of net sales, was to 61.6% in 2002, compared to 59.0% in 2001. This increase in costs was mainly due to higher depreciation expenses at Tamsa and Tavsa, higher raw material prices, energy costs and a higher provision for obsolete inventories. Some cost items denominated in U.S. dollars also impacted the cost in peso terms due to the depreciation of the peso.

Selling, general and administrative expenses

Selling, general and administrative expenses, or SG&A, in 2002, as a percentage of net sales, were 17.7%, compared to 18.7% in 2001. In absolute terms, SG&A decreased 7.6% from Ps1,288,744 thousand in 2001 to Ps1,191,082 thousand in 2002. Selling expenses in 2002 remained stable when compared to those incurred in 2001, representing 11.1% in 2002 and 11.0% in 2001. General and administrative expenses in 2002 decreased to 6.6% of net sales from 7.7% in 2001, mainly due to a reduction in personnel and general expenses.

Comprehensive financing cost

Comprehensive financing cost during 2002 was Ps165,924 thousand, compared to Ps42,106 thousand in 2001. This increase was primarily due to an exchange related loss of Ps178,965 thousand in 2002, compared to an exchange related gain of Ps14,841 thousand in 2001, mainly derived from the 85% devaluation of the Venezuelan bolivar, as Tavsa’s debt is denominated in U.S. dollars, as well as to the 12.8% depreciation of the Mexican peso during the year. The increase in comprehensive financing cost was partially offset by a monetary gain of Ps59,340 thousand in 2002, compared to Ps24,225 thousand in 2001, and by lower net interest expenses in 2002 of Ps46,299 thousand, compared to Ps81,172 thousand in 2001, due to lower interest rates.

Other expenses – Net

Other expenses totaled Ps13,115 thousand in 2002, compared to Ps26,834 thousand in 2001. This decrease in expenses stems from operations where Tamsa acted as a trader with respect to products from the other Tenaris companies.

Income tax, asset tax and employees’ statutory profit sharing

Income tax, asset tax and employee statutory profit sharing provisions totaled Ps307,052 thousand during 2002, compared to Ps586,794 thousand in 2001. Tax benefits in 2002 include Ps355,620 thousand, which resulted primarily from a favorable court judgment for tax inequality obtained in May 2002. Additionally, Tamsa recorded a net deferred tax credit of Ps246,938 thousand in 2002, resulting from a change of tax rates of 35%, which will be reduced by 1% annually from year 2003 until it becomes into a rate of 32% in year 2005, compared to a net deferred tax charge of Ps5,916 thousand in 2001.

Equity in loss of associated companies

Losses from associated companies totaled Ps16,047 thousand in 2002, compared to Ps290,930 thousand in 2001. Tamsa’s losses from associated companies are mainly attributable to its 14.1% equity participation in Amazonia through its subsidiary Tamsider LLC (Tamsider). The decrease in Tamsa’s losses from associated companies in 2002 was primarily the result of a loss in Amazonia of Ps39,906 thousand compared to Ps305,692 thousand in 2001. The net loss in Amazonia during 2002 included a

credit of Ps77,894 thousand, due a monetary gain derived from the application of Statement B-15, compared to Ps41,752 thousand in 2001. Additionally, in 2002 Tamsa’s loss in Amazonia was partially offset by a gain of Ps23,859 thousand in other associated companies. See “Other transactions”

Net income

Net income during 2002 totaled Ps1,136,023 thousand, compared to Ps578,638 thousand in 2001. This increase of 96.3% is mainly due to lower net income tax and lower losses from associated companies, which more than offset a lower operating profit and a higher comprehensive financing cost. Net income corresponding to majority shareholders during 2002 totaled Ps1,177,049 thousand, compared to Ps574,947 thousand in 2001.

Tavsa’s net losses for 2002 were Ps136,754 thousand, compared to a net gain of Ps12,294 thousand for 2001, due to lower sales, lower absorption of fixed and semi-fixed costs and to an exchange related loss resulting from the impact of the devaluation of the Venezuelan bolivar on Tavsa’s U.S. dollar-denominated debt. Minority interest associated with these results represented a loss of Ps41,026 thousand in 2002, compared to a gain of Ps3,691 thousand in 2001.

Other Transactions

Amazonia

Tamsa’s original investment in Amazonia was made through its subsidiary Tamsider in the amount of US$87.8 million, which represented 12.5% equity participation. On February 23, 2000, Amazonia and Sidor completed the restructuring and rescheduling of their indebtedness, which became effective in March 3, 2000. The agreement reached with Amazonia’s and Sidor’s lenders included additional funding by Sidor’s shareholders of US$300 million, of which US$210 million were provided indirectly by Amazonia’s shareholders through convertible subordinated debt and equity contributions. Tamsider made an additional investment of US$36.1 million, of which US$18.1 million was made in form of equity and subscribed US$18.0 million of convertible debentures issued by Amazonia, Tamsider’s equity interest increased from 12.5% to 14.1 percent.

As a consequence of the worldwide steel industry crisis, the slow-down in the financial markets the adverse economic and political situation in Venezuela and other adverse factors, at December 31, 2002, Sidor was in default on certain contractual obligations under the restructuring agreement with its creditors and the Venezuelan Bank of Economic and Social Development (formerly known as the Venezuelan Investment Fund), including: (i) payment of interest due on December 18, 2001, (ii) the deposit of payments of interest, in reserve accounts, on certain debts as stated in the restructuring agreements, and (iii) meeting certain financial ratios. As a result of this default, Sidor’s debt is callable at the option of its creditors.

As a result of the events mentioned above, as of December 31, 2001, Tamsider recorded a valuation allowance of Ps154,688 thousand (US$15.0 million) to reduce the value of its investment in Amazonia and its convertible subordinated debt, which was applied against the equity in the result of Amazonia for 2002. The value of Tamsa’s initial investment through Tamsider and its additional capital contribution have been reduced to Ps136,433 thousand (US$13.2 million) as of December 31, 2002, due to the recognition of Amazonia’s losses using the equity method of accounting. At December 31, 2002, Tamsider had a maximum exposure of US$98.8 million corresponding to guarantees covering Sidor’s debt with the Venezuelan Bank of Economic and Social Development. In addition, as of December 31, 2002, Tamsa had a guarantee of US$9.4 million for its share of a performance bond for certain of Amazonia’s contractual obligations under the Sidor purchase agreement, this guarantee expired in January 2003. Sidor and Amazonia are currently involved in discussions with their creditors and the Venezuelan Investment Fund regarding a possible restructuring of their loan agreements. We cannot give you any assurance as to whether Sidor or Amazonia will succeed in restructuring their existing indebtedness, or that their lenders will not accelerate any defaulted indebtedness in accordance with the terms of the applicable loan agreements or foreclose on any of the assets of Sidor or Amazonia pledged as collateral.

Declaration of dividends and amendment of by-laws

On March 19, 2002, Tamsa’s board of directors proposed a dividend payment in the amount of approximately US$30 million equivalent to US$0.08748 per share or US$0.4374 per ADR. Tamsa’s shareholders approved the dividend payment at the annual ordinary shareholders’ meeting held on April 30, 2002. The record date for such dividend payment was May 31, 2002.

On April 30, 2002, Tamsa had an extraordinary shareholders meeting to authorize the amendment of its by-laws in order to comply with certain amendments to the Mercantile and Securities laws in Mexico.

Agreement relating natural gas

During March and April of 2002, Tamsa entered into two option contracts with Citibank, N. A., New York and JP Morgan Chase Bank in order to cover its exposure from the three-year agreement signed on February 22, 2001 with Petróleos Mexicanos (Pemex), which consisted of the supply of 296,600 million BTUs (British Thermal Units) of natural gas, on a monthly basis, from January 1, 2001 to December 31, 2003, at a fixed price of US$4.00 per million BTU. The two option contracts consist in to

swap the fixed price from US$4.00 per million BTU established in the contract to the market price, to sell 160,000 million BTU of natural gas monthly for each contract, at a strike price of US$4.00 per million BTU when market prices of natural gas are not lower than US$2.00 and not higher than US$4.0 per million BTU, for the period from May 1, 2002 to February 28, 2003; likewise, for the period from March 1, to December 31, 2003, the strike price is US$4.00 per million BTU when market prices of natural gas are not lower than US$2.25 and not higher than US$4.00 per million BTU. Likewise, the Company is obligated to sell natural gas at US$4.00 when market prices are higher than US$4.00 for the period from May 1, 2002 to December 31, 2003. Additionally, the Company is obligated to buy 320,000 million BTU of natural gas monthly at a base price of US$2.765 per million BTU, for the period from January 1, 2004 to December 31, 2005.

Exchange offer by Tenaris

On November 11, 2002, Tenaris, S.A. (“Tenaris”), a Luxembourg corporation created in 2001 to hold investments in the steel pipe manufacturing and distribution businesses, made a public offer to exchange its ordinary shares and American Depositary Shares (ADSs) for the common shares and ADSs of Tamsa and two other companies, for ordinary shares and ADS of Tenaris. After consummation of this exchange offer on December 17, 2002, Tenaris beneficially owned, directly or indirectly, 94.5% of Tamsa’s outstanding capital stock, with the remaining 5.5% of Tamsa’s capital stock held by other investors. As of March 31, 2003, these ownership percentages remain unchanged.

Tamsa is a subsidiary of Tenaris, the leading global manufacturer and supplier of seamless steel pipe products and associated services to the oil and gas, energy and other industries.

Liquidity and capital resources



	For the year ended
	December 31,

	2002			2001


	(Thousands of constant
	December 31, 2002 Mexican pesos)
Cash provided by operations after extraordinary items		Ps1,280,043			Ps1,209,529
Cash used in investment activities		(205,515	)		(903,792	)
Cash used in financing activities		(274,471	)		(48,671	)

Increase (decrease) in cash and cash equivalents		800,057			257,066
Cash and cash equivalents at the beginning of period		588,632			331,566

Cash and cash equivalents at the end of period		Ps 1,388,689			Ps 588,632

Year Ended December 31, 2002 Compared to Year Ended December 31, 2001

Tamsa’s cash balances at December 31, 2002 increased to Ps1,388,689 thousand from Ps588,632 thousand at December 31, 2001. Ps1,280,043 thousand was provided by operations after extraordinary items. Tamsa used the funds in the following activities: capital expenditures of Ps184,212 thousand, contributions in associated companies in the amount of Ps21,303 thousand and a dividend payment of Ps280,658 thousand.

Financings

Tamsa’s financial debt was Ps1,723,219 thousand (US$167.1 million) as of December 31, 2002, compared to Ps1,608,970 thousand (US$166.5 million) as of December 31, 2001 Financial debt, net of cash and cash equivalents, at year-end decreased to Ps334,530 thousand (US$32.4 million) in 2002, compared to Ps1,020,338 thousand (US$105.6 million) in 2001. The deferred tax liability as of December 31, 2002 equaled Ps2,171,121 thousand.

Total liabilities increased from Ps4,949,637 thousand as of December 31, 2001 to Ps5,368,728 thousand as of December 31, 2002, mainly due to an increase in trade accounts, other accounts payable, accrued interests and unsecured loans from financial institutions to Tavsa.

As of December 31, 2002, Tamsa had US$111.0 million of short-term credit lines (export-import financing and unsecured loans) with Mexican and foreign financial institutions, of which US$36.9 million were short-term loans to Tavsa and guarantees. Short-term debt as of December 31, 2002 was comprised of (i) US$21.6 million of short-term loans to Tavsa, guaranteed by Tamsa, were outstanding, with maturities of 270 days at an average annual interest rate of 3.5%, (ii) US$78.0 million of the current portion of long-term syndicated loan and (iii) US$1.3 million of the current portion of the long-term debt of Riga. As of December 31, 2001, US$25.6 million of short-term loans to Tavsa guaranteed by Tamsa were outstanding, with maturities between 139 and 194 days at an average annual interest rate of 3.98 percent.

Long-term debt as of December 31, 2002 was US$66.3 million, corresponding mainly to a current portion of long-term debt of the US$130.0 million syndicated loan of Tamsa. Additionally, this debt is also comprised of US$15.5 million debt to Riga guaranteed by Tamsa, and US$10.5 million debt to Tavsa, guaranteed by a subsidiary of Tamsa, with an average annual interest rate of 3.05% and 3.29%, respectively.

There were no scheduled repayments on any long-term loan during 2002.

On July 1, 1991, Tamsa established a U.S. and Euro commercial paper program for up to US$50.0 million, with maturities of up to 360 days. In August 1992, Tamsa increased the program to US$75.0 million. As of December 31, 2002, this program had been terminated.

On December 14, 2001, Tamsa subscribed a new 30-month unsecured syndicated loan for US$130.0 million with various financial institutions for the repayment of a US$100.0 million loan and for general corporate purposes.

Tamsa does not have any limitations on investments in fixed assets or in other companies. Dividend payments and repurchase of shares are permitted if there are no events of default under the syndicated loan agreement and if such payments or repurchases of shares do not otherwise result in an event of default under the syndicated loan agreement. Tamsa is required to comply with certain financial ratios related to working capital, debt to EBITDA levels and debt service.

At December 31, 2002, Tamsa was in compliance with all financial and other covenants. Tamsa’s debt service ratio was 40.3 to one in 2002 and 23.4 to one in 2001. Debt to EBITDA ratio was 1.5 in 2002 and 1.4 in 2001. See note 4 to Tamsa’s annual financial statements.

Recent Events

On February 28, 2003 the board of directors of Tamsa resolved to submit for the approval of the General Shareholders Meeting to be held on April 30, 2003, a proposal for the payment of a dividend of US$0.08748 per share or US$0.4374 per ADR (one ADR = five shares) and the creation of a reserve for future dividends of US$70 million. Additionally, the Board of Directors proposes that the power to decree and pay dividends against this reserve be delegated to the board of directors, unless otherwise decided by a subsequent shareholders meeting.

On March 31, 2003, Tenaris announced that it intends to cause the delisting of Tamsa from the Mexican Stock Exchange and the American Stock Exchange, the termination of Tamsa’s ADR facility and, if and when appropriate, the termination of Tamsa’s registration with the U.S. Securities and Exchange Commission. Tenaris also announced that, subject to the approvals of the U.S. and Mexican Securities regulators and Tamsa’s extraordinary shareholders meeting, it intends to effect an exchange of its shares and ADSs for any Tamsa shares and ADSs not held by Tenaris or its affiliates in accordance with Mexican and U.S. laws. Tenaris stated that it did not expect to obtain the requisite approvals, and consequently be in a position to propose any exchange of shares and ADSs, prior to June 2003.

TUBOS DE ACERO DE MEXICO, S. A.

AND SUBSIDIARIES

(a subsidiary of Tenaris, S.A.)

CONSOLIDATED FINANCIAL STATEMENTS

AND STATUTORY AUDITOR’S REPORT

December 31, 2002, 2001 and 2000

(This page intentionally left blank)

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S.A.)

CONSOLIDATED FINANCIAL STATEMENTS

AND STATUTORY AUDITOR’S REPORT

December 31, 2002, 2001 and 2000

TABLE OF CONTENTS


Contents		Page

Report of independent accountants			F-2
Consolidated financial statements:
	Balance sheets		F-4
	Statements of income		F-5
	Statements of changes in shareholders’ equity		F-6
	Statements of changes in financial position		F-7
	Notes to financial statements		F-8
Statutory Auditor’s Report			F-40

F-1

(PRICEWATERHOUSECOOPERS LETTERHEAD)

REPORT OF INDEPENDENT ACCOUNTANTS

February 21, 2003

To the Shareholders of
Tubos de Acero de México, S. A.


1.	We have audited the accompanying consolidated balance sheets of Tubos de Acero de México, S. A. and subsidiaries at December 31, 2002 and 2001, and the related consolidated statements of income, of changes in shareholders’ equity and of changes in financial position for the three years ended December 31, 2002, 2001, and 2000, all expressed in constant Mexican pesos of December 31, 2002 purchasing power. These financial statements are the responsibility of the company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

2.	We conducted our audits in accordance with auditing standards generally accepted in Mexico and in the United States of America. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement and that they were prepared in accordance with generally accepted accounting principles. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

3.	In our opinion, the aforementioned consolidated financial statements present fairly, in all material respects, the consolidated financial position of Tubos de Acero de México, S. A. and subsidiaries at December 31, 2002 and 2001, and the results of their operations and the changes in their shareholders’ equity and in their financial position for the three years ended December 31, 2002, 2001 and 2000 in conformity with accounting principles generally accepted in Mexico.

F-2

(PRICEWATERHOUSECOOPERS LETTERHEAD)

Accounting principles generally accepted in Mexico vary in certain important respects from accounting principles generally accepted in the United States of America (US GAAP). The application of the latter would have affected the determination of consolidated net income expressed in Mexican pesos of December 31, 2002 purchasing power for the years ended December 31, 2002, 2001 and 2000, and the determination of consolidated shareholders’ equity and consolidated financial position, also expressed in Mexican pesos of December 31, 2002 purchasing power, at December 31, 2002, 2001 and 2000, to the extent summarized in Note 12 to the consolidated financial statements.

PricewaterhouseCoopers

-s- Bernardo Ismael Gonzalez Vidrio

F-3

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(Note 1)

CONSOLIDATED BALANCE SHEETS

Thousands of Mexican pesos of

December 31, 2002 purchasing power



		December 31,

		2002			2001

ASSETS
CURRENT ASSETS:
Cash and cash equivalents (Note 8a.)			Ps1,388,689			Ps588,632
Accounts and notes receivable — Net (Note 8b.)			2,582,889			1,767,614
Inventories — Net (Note 8c.)			1,488,968			1,528,581
Prepaid expenses and recoverable taxes (Note 8d.)			49,378			69,532

	Total current assets		5,509,924			3,954,359
INVESTMENTS IN ASSOCIATED COMPANIES — Net (Note 11)			517,697			614,351
PROPERTY, PLANT AND EQUIPMENT — Net (Note 3)			8,280,347			7,928,131
OTHER ASSETS			12,144			81,442

	Total assets		Ps14,320,112			Ps12,578,283

LIABILITIES AND SHAREHOLDERS’ EQUITY
CURRENT LIABILITIES:
Notes payable to financial institutions, including current portion of long-term debt (Note 4)			Ps1,040,016			Ps247,385
Trade accounts and notes payable			881,936			652,518
Other accounts payable and accrued expenses (Note 8e.)			420,463			341,991

	Total current liabilities		2,342,415			1,241,894

LONG-TERM DEBT (Note 4)			683,203			1,361,585
OTHER LIABILITIES AND DEFERRED CREDITS			171,989			192,001
DEFERRED INCOME TAX (Note 6)			2,171,121			2,154,157

	Total non-current liabilities		3,026,313			3,707,743

	Total liabilities		5,368,728			4,949,637

SHAREHOLDERS’ EQUITY (Note 5):
Capital stock			10,694,466			10,694,466
Additional paid-in capital			6,993,640			6,993,640
Retained earnings			16,950,221			16,053,830
Initial effect of deferred income tax			(2,389,797	)		(2,389,797	)
Cumulative translation adjustment			(898,224	)		(833,676	)
Cumulative loss from holding non-monetary assets			(22,386,592	)		(22,919,670	)

Equity of majority shareholders			8,963,714			7,598,793
Minority interest in consolidated subsidiary			(12,330	)		29,853

	Total shareholders’ equity		8,951,384			7,628,646
CONTINGENCIES AND COMMITMENT (Notes 9 and 10)

	Total liabilities and shareholders’ equity		Ps14,320,112			Ps12,578,283

The accompanying twelve notes are an integral part of these consolidated financial statements.



Guillermo Vogel H.		Claudio Gugliuzza V.
Vice Chairman of the Board		Administrative Director

F-4

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(Note 7)

Thousands of Mexican pesos — except income

per share — of December 31, 2002 purchasing power



	Years ended December 31,

	2002			2001			2000

Net sales		Ps6,728,275			Ps6,899,027			Ps6,463,007
Cost of products sold		(4,145,970	)		(4,067,468	)		(4,231,637	)
Operating expenses		(1,191,082	)		(1,288,774	)		(1,175,100	)

Operating profit		1,391,223			1,542,785			1,056,270
Comprehensive financing cost (Note 1a.)		(165,924	)		(42,106	)		(88,544	)
Other expenses — Net		(13,115	)		(26,834	)		(9,879	)

Income before the following items		1,212,184			1,473,845			957,847
Income tax, asset tax and employees’ statutory profit sharing (Note 6)		(60,114	)		(592,710	)		(483,743	)

Income before equity in associated companies and other items		1,152,070			881,135			474,104
Equity in loss of associated companies (Note 11)		(16,047	)		(290,930	)		(52,608	)

Income before the following item		1,136,023			590,205			421,496
Cumulative effect of change in accounting principle (Note 1q.)					(11,567	)

Net income for the year		Ps1,136,023			Ps578,638			Ps421,496

Income corresponding to majority shareholders		Ps1,177,049			Ps574,947			Ps439,319
Minority interest in (loss) income of consolidated subsidiary		(41,026	)		3,691			(17,823	)

Net income for the year		Ps1,136,023			Ps578,638			Ps421,496

Income per share in Mexican pesos (Note 1o.):

Income per share before the following item		Ps3.35			Ps1.74			Ps1.24
Cumulative effect of change in accounting principle					(0.03	)

Net income per share		Ps3.35			Ps1.71			Ps1.24

The accompanying twelve notes are an integral part of these consolidated financial statements.



Guillermo Vogel H.		Claudio Gugliuzza V.
Vice Chairman of the Board		Administrative Director

F-5

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

(Note 5)

Thousands of Mexican pesos of

December 31, 2002 purchasing power


								Initial						Cumulative loss						Minority
			Additional					effect of			Cumulative			from holding			Equity of			interest in			Total
	Capital		paid-in		Retained			deferred			translation			non-monetary			majority			consolidated			shareholders’
	stock		capital		Earnings			income tax			adjustment			assets			shareholders			subsidiary			equity

Balances at January 1, 2000		Ps10,694,466		Ps6,993,640		Ps15,671,845						(Ps572,053	)		(Ps22,125,692	)		Ps10,662,206			Ps30,996			Ps10,693,202
Dividends paid						(320,176	)											(320,176	)					(320,176	)
Comprehensive loss (Note 1r.)						439,319			(Ps2,389,797	)		(149,567	)		(486,255	)		(2,586,300	)		46			(2,586,254	)

Balances at December 31, 2000		10,694,466		6,993,640		15,790,988			(2,389,797	)		(721,620	)		(22,611,947	)		7,755,730			31,042			7,786,772
Dividends paid						(312,105	)											(312,105	)					(312,105	)
Comprehensive income (Note 1r.)						574,947						(112,056	)		(307,723	)		155,168			(1,189	)		153,979

Balances at December 31, 2001		10,694,466		6,993,640		16,053,830			(2,389,797	)		(833,676	)		(22,919,670	)		7,598,793			29,853			7,628,646
Dividends paid						(280,658	)											(280,658	)					(280,658	)
Comprehensive income (Note 1r.)						1,177,049						(64,548	)		533,078			1,645,579			(42,183	)		1,603,396

Balances at December 31, 2002		Ps10,694,466		Ps6,993,640		Ps16,950,221			(Ps2,389,797	)		(Ps898,224	)		(Ps22,386,592	)		Ps8,963,714			(Ps12,330	)		Ps8,951,384

The accompanying twelve notes are an integral part of these consolidated financial statements.



Guillermo Vogel H.		Claudio Gugliuzza V.
Vice Chairman of the Board		Administrative Director

F-6

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN FINANCIAL POSITION

Thousands of Mexican pesos of

December 31, 2002 purchasing power



		Years ended December 31,

		2002			2001			2000

Resources provided by operations:
Income before cumulative effect of change in accounting principle			Ps1,136,023			Ps590,205			Ps421,496

Adjustments to reconcile net income to resources provided by operating activities:
Depreciation and other			501,307			433,810			417,005
Deferred income tax			(246,938	)		5,916			176,285
Equity in loss of associated companies			16,047			290,930			52,608
Exchange loss (gain) which did not require resources			108,402			17,621			(8,876	)
(Increase) decrease in accounts receivable, notes receivable, prepaid expenses and recoverable taxes			(702,823	)		422,760			(423,204	)
Decrease (increase) in inventories			175,622			(199,577	)		37,581
Increase (decrease) in trade accounts and other accounts payable and accrued expenses			292,403			(340,569	)		347,085

	Total adjustments		144,020			630,891			598,484

Resources provided by operations before the following item			1,280,043			1,221,096			1,019,980
Cumulative effect of change in accounting principle						(11,567	)

Resources provided by operations			1,280,043			1,209,529			1,019,980

Resources used in investing activities:
Increase in interest in associated companies			(21,303	)		(52,606	)		(404,651	)
Purchases of property, plant and equipment — Net			(184,212	)		(851,186	)		(452,099	)

Resources used in investing activities			(205,515	)		(903,792	)		(856,750	)

Resources used in financing activities:
Net increase (decrease) in short-term notes payable to banks			776,016			(106,226	)		(867,259	)
(Decrease) increase in long-term debt — Net			(769,829	)		369,660			1,056,344
Dividends paid			(280,658	)		(312,105	)		(320,176	)

Resources used in financing activities			(274,471	)		(48,671	)		(131,091	)

Increase in cash and cash equivalents			800,057			257,066			32,139
Cash and cash equivalents at beginning of year			588,632			331,566			299,427

Cash and cash equivalents at end of year			Ps1,388,689			Ps588,632			Ps331,566

The accompanying twelve notes are an integral part of these consolidated financial statements.



Guillermo Vogel H.		Claudio Gugliuzza V.
Vice Chairman of the Board		Administrative Director

F-7

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

(Amounts in thousands of Mexican pesos (Ps) of December 31, 2002 purchasing power and

thousands of US dollars, euros and Japanese yen, except for exchange rates)

Note 1 — Main Activity and Summary of Significant Accounting Policies:

Tubos de Acero de México, S. A. (Tamsa or the Company) was formed in 1952 and consists of a group of companies that manufacture and sell seamless steel pipe, primarily for use in the petroleum industry.

Tamsa is a subsidiary of Tenaris, S. A. (Tenaris), a Luxembourg corporation, created in 2001 to hold investments in the steel pipe manufacturing and distribution businesses. Tenaris is a leading global manufacturer and supplier of seamless steel pipe products and associated services to the oil and gas, energy and other industries (see Note 5).

At December 31, 2002 and at February 21, 2003, date of issuance of the consolidated financial statements, Tenaris and its subsidiaries had an ownership interest in Tamsa of 94.5%.

The accompanying consolidated financial statements are expressed in thousands of Mexican pesos of December 31, 2002 purchasing power and have been prepared applying accounting principles generally accepted in Mexico.

The significant accounting policies, including the concepts, methods and criteria related to the recognition of the effects of inflation on the financial information, are summarized below:

a. Recognition of the effects of inflation in the consolidated financial statements

The Company recognizes the effects of inflation in its consolidated financial statements in accordance with accounting principles generally accepted in Mexico. As a result of the recognition of the effects of inflation in the consolidated financial statements, the following concepts are included.

The gain (loss) from holding non-monetary assets mainly represents the change in the basis of restatement of non-monetary assets (primarily property, plant and equipment) vis-a-vis the rate of inflation as measured by the National Consumer Price Index (NCPI — see Note 1f.). Additionally, this item includes the effect of the restatement of inventories and cost of products sold at replacement cost as required by Statement B-10 issued by the Mexican Institute of Public Accountants (MIPA). This gain (loss) is included directly in shareholders’ equity as a component of comprehensive income (loss) of the year.

Gain on net monetary position represents the purchasing power gain from holding monetary items, measured by the NCPI, in Mexican pesos of December 31, 2002 purchasing power. This item is included in comprehensive financing cost in the accompanying consolidated statements of income, as shown below:



	Years ended December 31,

	2002			2001			2000

Gain on net monetary position		Ps59,340			Ps24,225			Ps24,810
Interest and financing expense — Net		(46,299	)		(81,172	)		(76,393	)
Foreign exchange (loss) gain — Net		(178,965	)		14,841			(36,961	)

Comprehensive financing cost		(Ps165,924	)		(Ps42,106	)		(Ps88,544	)

Inflation rates in Mexico and Venezuela for the reported periods were as follows:


	2002		2001		2000

Mexico		5.7%		4.4%		9.0%
Venezuela		31.2%		12.3%		12.8%

F-8

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

b. Principles of consolidation and valuation of investments in associated companies

The accompanying consolidated financial statements include the financial statements of Tamsa and its wholly-owned subsidiaries, which are shown below:


Company		Main activity

Inmobiliaria Tamsa, S.A. de C.V.		Leasing of real estate
Tamsider, S.A. de C.V. (Tamsider) and subsidiaries, including Tavsa — Tubos de Acero de Venezuela, S. A. (Tavsa)		Promotion and organization and of steel-related companies
Tamtrade, S.A. de C.V. (Tamtrade)		Sale of seamless steel pipe
Empresas Riga, S.A. de C.V. (Riga) (acquired on June 20, 2001)		Manufacture of welded connectors made of seamless steel pipe
Socover, S.A. de C.V. (acquired on October 1, 2001 and merged with Tamtrade on January 1, 2003)		Sale of seamless steel pipe
Corporación Tamsa, S.A. (liquidated on August 1, 2002)		Sale of seamless steel pipe

Balances and transactions between Tamsa and its subsidiaries were eliminated in consolidation.

Investments in associated companies in which Tamsa owns 10% or more of the common stock are accounted for by the equity method of accounting. Investments representing less than 10% of the investee’s equity are carried at acquisition cost, restated using the NCPI.

c. Cash and cash equivalents

Cash and cash equivalents comprise cash and highly liquid short-term securities with an initial maturity of less than three months. Highly liquid short-term securities are carried at fair market value (see Note 8a.).

d. Inventories

Inventories are stated at their estimated net replacement cost, which is not in excess of their net realizable value (see Note 8c.). The cost of products sold reflects their estimated replacement cost at the time of sale.

In conformity with industry practices, manufacturing tools, spare parts and supplies are included under current assets, even though they may not be consumed within one year.

Based on inventory turnover levels, the Company increased its allowance for obsolescence, debiting the cost of products sold by Ps15,466 in 2002 and Ps2,045 in 2000. In 2001 it was not necessary to increase this allowance.

e. Maintenance expenses of production capacity

Ordinary maintenance expenses are expensed as cost of products sold in the period in which they are incurred.

Special maintenance expenses incurred to maintain the production capacity of the industrial facilities are recorded as deferred expenses when incurred and amortized over a period of 12 to 24 months, which corresponds to the period in which the benefits of the maintenance are expected to be realized (see Note 8d.).

F-9

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

f. Property, plant and equipment

The Company follows the following policies in respect of property, plant and equipment:


	•	Property and domestically-sourced machinery and equipment are restated by applying factors derived from the NCPI to their carrying value as determined at December 31, 1996, or to their acquisition cost if purchased after that date.

	•	Imported machinery and equipment are restated by applying inflation factors of the country of origin to the acquisition cost (expressed in the original currency), and subsequently translated at the period-end exchange rate.

As a result of the foregoing valuation methods, the Company recorded a gain from holding non-monetary assets of Ps636,326 in 2002 and a loss from holding non-monetary assets of Ps288,380 in 2001 and Ps624,849 in 2000, which are included as a component of comprehensive income (loss) of the year.

Depreciation is calculated by the straight-line method, based on the useful lives of the assets as determined by the Company (see Note 3).

Fully depreciated assets are retained in property and accumulated depreciation accounts until they are removed from service. In the case of disposals, assets and related depreciation are removed from the accounts and the net amount, less proceeds from disposal, is charged or credited to income.

g. Licenses and computer software costs

Licenses and costs related to the development of software for internal use are capitalized and amortized on a straight-line basis over three years.

h. Goodwill

Goodwill is restated by applying inflation factors derived from the NCPI to the acquisition cost and is amortized by the straight-line method over a period that in Management’s opinion approximates the period in which the acquired subsidiaries will benefit the Company. At December 31, 2002, goodwill recorded in previous years had been wholly amortized.

i. Long-lived assets

The Company periodically evaluates the carrying value of long-lived assets to be held and used, including intangible assets, when events and circumstances warrant such a review. The carrying value of a long-lived asset is considered impaired when the anticipated undiscounted cash flow from such an asset is less than its carrying value. In that event, a loss is recognized based on the amount by which the carrying value exceeds the fair market value of the long-lived asset. Fair market value is determined primarily using the anticipated cash flows discounted at a rate commensurate with the risk involved.

j. Seniority premiums

Seniority premiums to which employees are entitled upon termination of employment, for any cause, after 15 years of service, in accordance with the Federal Labor Law, are recognized as expenses as these premiums accrue, based on actuarial calculations, in conformity with Statement D-3, “Labor Liabilities” issued by the MIPA. The Company has established a trust fund and a provision for this purpose.

F-10

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

Following is a summary of the relevant significant data related to these benefits:



	December 31,

	2002			2001			2000

Actuarially determined projected benefit obligation		(Ps13,527	)		(Ps12,004	)		(Ps9,787	)
Liability reserve to cover the plan		10,969			10,890			11,749
Net assets of the trust		2,127			2,208			1,454
Unamortized prior service cost and assumption variations and experience adjustments		431			(1,094	)		(3,416	)

Net projected benefit obligation		Ps—			Ps—			Ps—


Accumulated benefit obligation		(Ps11,762	)		(Ps10,439	)		(Ps8,525	)
Liability reserve to cover the plan		10,969			10,890			11,749
Net assets of the trust		2,127			2,208			1,454

Accumulated net asset		1,334			2,659			4,678
Net projected benefit obligation

Additional liability		Ps—			Ps—			Ps—



	Years ended December 31,

	2002			2001			2000

Service cost		Ps729			Ps652			Ps674
Interest cost		523			432			455
Return on plan assets		(132	)		(96	)		(79	)
Amortization of transition assets and assumption variations and experience adjustments		183			(51	)		12

Net cost for the year		Ps1,303			Ps937			Ps1,062

The following actuarial assumptions were used to determine the present value of accumulated obligations for seniority premiums (excluding inflation effects):



	Years ended December 31,

	2002		2001		2000

Discount rate		4.50%		4.50%		4.50%
Salary increase rate		1.00%		1.00%		1.00%
Return on plan assets		6.00%		6.50%		6.00%

Other benefits based on length of service to which employees may be entitled in the event of dismissal or death, in accordance with the Federal Labor Law, are charged to income when they become payable.

k. Foreign currency balances and transactions

Transactions in foreign currencies are recorded at the exchange rates prevailing on the dates they are entered into. Balances denominated in foreign currencies are translated at period-end exchange rates. Exchange differences arising from fluctuations in rates between the date of the transaction and the date of settlement, or the balance sheet date, are charged or credited to income.

The financial statements of foreign subsidiaries and associated companies classified as foreign entities are restated using the NCPI of the country in which the entity operates and subsequently translated into Mexican pesos at the exchange rate of the year-end.

The financial statements of foreign subsidiaries classified as integrated foreign operations are translated as follows: a) monetary assets and liabilities at the exchange rate on the date of the financial

F-11

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

statements; b) non-monetary items at the historical exchange rate; c) income statement items at the average monthly exchange rate; and d) the translation gain or loss is recorded as a component of comprehensive financing cost. Mexican peso financial statements are restated at the Company’s balance sheet date by applying the provisions of Statement B-10.

l. Revenue recognition

The Company recognizes its revenue in accordance with international commercial terms (incoterms), pursuant to which delivery of products to customers finishes at different points, ranging from Tamsa’s to the customer’s site.

m. Debt costs

Costs related to syndicated loans are amortized over the term of the related debt.

n. Income tax, asset tax and employees’ statutory profit sharing

Income tax and employees’ statutory profit sharing are charged to income of the period in which they are incurred. Asset tax is recorded as an advance payment of income tax, at its estimated recoverable value at the date of the financial statements.

Deferred income tax is recognized by the comprehensive assets and liabilities method. This method consists of calculating deferred income tax by applying the respective income tax rate to the temporary differences between the accounting and tax values of assets and liabilities at the financial statements date.

o. Net income per share

Net income per share is computed by dividing consolidated net income by the weighted average number of shares outstanding during the periods, taking into consideration the split mentioned in Note 5 (339,284,120 in 2002, 2001 and 2000). This weighted average number of shares outstanding excludes 3,650,000 shares in treasury in 2002 and owned by Tamsider in 2001 and 2000. As of December 31, 2002, 2001 and 2000, no dilutive instruments were outstanding (see Note 5).

p. Insurance

In accordance with industry practices, the Company is insured for catastrophic casualty and certain property and business interruption exposures. Additionally, the Company is insured for third party liability as well as for risks required to be covered by law or contract. Costs of insurance are recorded as prepaid expenses and amortized by the straight-line method over the term of the contracts. Costs resulting from noninsured losses are charged to income upon occurrence.

q. Derivative financial instruments

The Company occasionally enters into various derivative instruments to hedge its exchange rate exposures, mainly from balances in United States dollars ($), euros (EUR) and Japanese yens (JPY). Additionally, the Company enters into forward contracts to hedge the change in market prices related to raw material (aluminum) and fuel (natural gas), used in its operations.

Derivative financial instruments are valued at their fair value at the valuation date. Financial assets and liabilities derived from these financial instruments are accounted for in the balance sheet. Variations in the fair value of the financial instruments from one period to another are charged to income of the period. The cost of these contracts is amortized over their term, and is charged to interest expense (see Note 10).

F-12

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

Contracts to hedge the variations in market prices of natural gas do not exceed the production requirements of the period. Accrued gains or losses are charged to cost of products sold.

The cumulative effect at the adoption date of the fair market value (January 1, 2001) amounted to Ps11,567, net of taxes, and is shown as cumulative effect of change in accounting principle in 2001, in accordance with Statement A-7 “Comparability” issued by the MIPA.

r. Comprehensive income (loss)

The items that integrate earned surplus (deficit) capital during the year are shown in the statement of changes in shareholders’ equity under the concept of comprehensive income (loss). Comprehensive income (loss) is shown below:



	December 31,

	2002			2001			2000

Majority shareholders:
Net income		Ps1,177,049			Ps574,947			Ps439,319
Initial effect of deferred income tax								(2,389,797	)
Cumulative translation adjustment		(64,548	)		(112,056	)		(149,567	)
Gain (loss) from holding non-monetary assets
— Net of deferred income tax (see Note 6)		533,078			(307,723	)		(486,255	)

Comprehensive income (loss) of majority shareholders		1,645,579			155,168			(2,586,300	)

Minority shareholders:
Net (loss) income		(41,026	)		3,691			(17,823	)
Cumulative translation adjustment		(7,230	)		(1,168	)		19,107
Gain (loss) from holding non-monetary assets
— Net of deferred income tax (see Note 6)		6,073			(3,712	)		(1,238	)

Comprehensive (loss) income of minority shareholders		(42,183	)		(1,189	)		46

Total comprehensive income (loss)		Ps1,603,396			Ps153,979			(Ps2,586,254	)

s. New accounting standards

In December 2001, the MIPA issued revised Statement C-9, “Liabilities, Provisions, Contingent Assets and Liabilities and Commitments”, which supersedes the original Statements C-9 and C-12, both from 1974, and Circulars 46, 47 and 48. The provisions of this new Statement are effective for years commencing on or after January 1, 2003.

The objective of revised Statement C-9 is to establish rules for valuation and disclosure of liabilities and provisions, to determine particular rules for valuation and disclosure of contingent assets and liabilities, and to provide rules for disclosure of commitments acquired by an entity as a part of its normal activities. Management considers that the adoption of revised Statement C-9 will not have a material effect on the consolidated financial statements.

In January 2002, the MIPA issued revised Statement C-8, “Intangible Assets”, which supersedes the current Statement C-8, effective since 1976. The provisions of this new Statement are effective for years commencing on or after January 1, 2003.

The significant provisions of revised Statement C-8 are: (i) it establishes rules and criteria for accounting for research and development costs; (ii) pre-operating costs identified with research and development activities are charged to expenses; and (iii) valuation rules are based on a logical sequence of the assets’ useful life, considering initial recognition and valuation of the intangible asset, recognition of

F-13

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

an expense, additional payments and valuation after the initial recognition. Management considers that the adoption of revised Statement C-8 will not have a material effect on the consolidated financial statements.

Note 2 — Position in Foreign Currencies:

The Company had assets and liabilities denominated in foreign currencies, mainly US dollars, as follows:



		December 31,

		2002		2001

Assets:
	Cash and cash equivalents	$	126,081	$	44,483
	Other current assets (mainly receivables)		200,541		135,415
	Assets of foreign subsidiaries		7,525		20,213

			334,147		200,111

Liabilities:
	Notes payable to banks⁽¹⁾		100,850		25,600
	Other current liabilities		77,345		49,338
	Liabilities of foreign subsidiaries		6,281		6,821
	Long-term debt⁽²⁾		66,250		140,900
	Deferred liabilities		14,973		17,404

			265,699		240,063

	Net asset (liability) position	$	68,448	($	39,952	)


	(1)	Includes $21,600 in 2002 and $25,600 in 2001 of notes payable by Tavsa.

	(2)	Includes $10,500 in 2002 and $5,900 in 2001 of notes payable by Tavsa.

All of the above monetary assets and liabilities were translated at the exchange rates of Ps10.3125 and Ps9.1423 per US dollar at December 31, 2002 and 2001, respectively. Assets and liabilities from Tavsa were translated into Venezuelan bolivars (Bs) at the exchange rates of Bs1,400.50 and Bs758.00 per US dollar at December 31, 2002 and 2001, respectively.

As of February 21, 2003, date of issuance of the consolidated financial statements, exchange rates were Ps10.84 and Bs1,600.00 per US dollar.

The Company had non-monetary assets purchased in foreign currencies, or for which replacement values were mainly determinable in foreign currencies, as follows:



	December 31,

	2002		2001

Inventories	$	81,100	$	78,439
Property, plant and equipment		571,885		566,305
Investments in associated companies		50,200		62,123

F-14

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

The following represents a summary of foreign currency transactions carried out by the Company:



	Years ended December 31,

	2002			2001			2000

Sales	$	452,134		$	473,651		$	365,670
Inventory purchases		(147,968	)		(164,165	)		(129,662	)
Purchases of plant and equipment		(5,580	)		(17,778	)		(13,840	)
Operating expenses		(58,721	)		(59,619	)		(45,941	)
Financing costs — Net		(3,967	)		(8,182	)		(10,022	)

Note 3 — Property, Plant and Equipment:



							Remaining estimated years
	December,						of useful life

	2002			2001			2002		2001

Land		Ps434,096			Ps437,308

Buildings		2,502,140			2,263,914			34		35
Machinery and equipment		13,665,717			12,171,502			19 and 11		20 and 12

		16,167,857			14,435,416
Accumulated depreciation		(9,341,527	)		(8,077,623	)

		6,826,330			6,357,793

Construction in progress		1,019,921			1,133,030

		Ps8,280,347			Ps7,928,131

Depreciation expense for the years ended December 31, 2002, 2001 and 2000 amounted to Ps446,403, Ps396,290 and Ps386,896, respectively.

Note 4 — Debt Obligations:

a. Short-term debt

Notes payable to financial institutions with maturity within one year, and other short-term debt, were as follows:



	December 31,


	2002				2001

Unsecured loans from financial institutions		Ps222,750	$	21,600		Ps247,385	$	25,600
Current portion of long-term unsecured loans		12,891		1,250
Current portion of long-term syndicated loans		804,375		78,000

		Ps1,040,016	$	100,850		Ps247,385	$	25,600

The 2001 Mexican peso amounts were originally translated using the corresponding exchange rate and are restated in thousands of Mexican pesos of December 31, 2002 purchasing power.

The average annual interest rate on short-term debt for the years ended December 31, 2002 and 2001 were 3.61% and 5.77%, respectively.

Short-term debt at December 31, 2002, comprised $21,600 of loans to Tavsa guaranteed by Tamsa, bearing interest at 3.5% annually, $78,000 of the first two installments of the long-term syndicated loan and $1,250 of the first two installments of the long-term debt of Riga.

F-15

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

At December 31, 2001 short-term debt comprised $25,600 of loans to Tavsa, guaranteed by Tamsa, bearing interest at 3.98% annually.

Interest rates include the effect of a Mexican withholding tax of 4.9% and a Venezuelan withholding tax of 4.95%.

At December 31, 2002 the Company had approved lines of credit amounting to $111,000, of which $36,900 had been utilized for short-term loans to Tavsa and guarantees.

b. Long-term debt

Long-term debt was payable in US dollars and is analyzed as follows:



	December 31,


	2002						2001

Syndicated loan payable to foreign and Mexican financial institutions in three semi-annual installments from June 2003 to June 2004		Ps1,340,625		$	130,000			Ps1,256,253	$	130,000
Unsecured loans from financial institutions to subsidiary companies		159,844			15,500			105,332		10,900
Current portion of long-term debt		(817,266	)		(79,250	)

		Ps683,203		$	66,250			Ps1,361,585	$	140,900

The average annual interest rates paid on long-term debt for the years ended December 31, 2002 and 2001, were 3.19% and 6.91%, respectively.

On December 14, 2001 Tamsa entered into a new syndicated loan in the amount of $130,000, with a term of two and a half years. This new loan provides for payments of $26,000 in June 2003 and $52,000 each in December 2003 and June 2004, and bears interest at LIBOR plus 1.125 percentage points for the first two years, and at LIBOR plus 1.25 percentage points for the last six months. This loan was utilized to prepay on December 14, 2001 the syndicated loan of $100,000, with original maturity on May 23, 2002 and to cover working capital needs and for other general corporate purposes of the Company.

The annual interest rate on long-term syndicated loan, for the years ended December 31, 2002 and 2001, was 2.67% and 3.14%, respectively.

The long-term debt as of December 31, 2002 was $15,500 corresponding to debt of Riga in the amount of $5,000, guaranteed by Tamsa, bearing interest at 3.05% annually, with maturity in June, 2006 and with semi-annual installments of $625 commencing on June, 2003; and debt of Tavsa in the amount of $10,500, guaranteed by Tamsa, bearing interest at 3.29% annually, with maturity in May, 2004.

The long-term debt of $10,900, as of December 31, 2001, comprises debt of Tavsa in the amount of $5,900, guaranteed by Corporación Tamsa, S. A., bearing interest at 10.5% annually, and debt of Riga in the amount of $5,000, as mentioned above.

Interest rates include the effect of a Mexican withholding tax of 4.9% for Tamsa and Riga and a Venezuelan withholding tax of 4.95% for Tavsa.

F-16

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

Based on the existing terms of the above loan agreements, payments over the next four years are expected to be as follows:


Year ending
December 31,

2003	$	79,250
2004		63,750
2005		1,250
2006		1,250

	$	145,500

c. Covenants

The most significant covenants under the current syndicated loan agreement are as follows:


	•	Maintenance of minimum working capital ratios;

	•	Maintenance of maximum levels of total indebtedness; and

	•	Compliance with debt service ratios.

At December 31, 2002, and February 21, 2003, date of issuance of the consolidated financial statements, the Company was in compliance with the above-mentioned covenants.

The new syndicated loan is guaranteed by two of the Company’s subsidiaries.

Note 5 — Shareholders’ Equity:

On November 11, 2002, Tenaris made a public offer to exchange Tamsa’s ordinary shares and American Depositary Shares (ADS), listed on the Mexican Stock Exchange (BMV) and the American Stock Exchange (Amex), respectively, for ordinary shares and ADS of Tenaris. The public exchange offer ended on December 13, 2002, as a result, Tenaris owns, directly or indirectly, 94.5% of Tamsa’s outstanding shares, with the remaining 5.5% (shares or ADS) of Tamsa’s shares held by other investors. In accordance with Mexican Law, Tenaris has the right, and might be required by the Mexican National Banking and Securities Commission, to make a new public exchange offer to retire the remaining Tamsa shares from the BMV and the Amex.

At the April 27, 2001 ordinary meeting, the Company’s stockholders approved a five-to-one split of Tamsa’s shares effective July 10, 2001. Also, the conversion factor of the American Depositary Receipts (ADR) was modified, from one ADR to one share, to one ADR to five shares, so that the value of the ADR traded in the American Stock Exchange in New York would not be changed.

The objective of the split was to reduce the relative price of Tamsa’s shares and, therefore, to increase their trading volume in Mexico. For comparative purposes, the amounts of prior years related to number of shares have been adjusted to reflect the split retroactively.

All outstanding shares have been subscribed and paid in full and carry the same rights and obligations.

F-17

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

At December 31, 2002, the authorized capital stock consisted of 342,934,120 (68,586,824 before the split) common nominative shares with no par value. The number of authorized and outstanding shares at December 31, 2002, 2001 and 2000 was as follows:


Series		Authorized		In treasury⁽¹⁾			Outstanding

	Single		342,934,120		(3,650,000	)		339,284,120


	(1)	Shares held in treasury in 2002 and owned by Tamsider, a subsidiary of the Company, in 2001 and 2000.These shares were eliminated in consolidation.

At the December 16, 2002 ordinary Tamsider shareholders’ meeting, a reduction of variable capital stock in the amount of Ps60,225 was approved, which was effected by the transfer of a certificate held by Tamsider for 3,650,000 shares of Tamsa.

At the April 30, 2002 ordinary shareholders’ meeting, dividends amounting to Ps283,671 (Ps273,546 nominal, equivalent to $0.0875 dollars per share and to $0.4374 dollars per ADR at the exchange rate of Ps9.1182 per dollar) were declared, payable on May 31 of that year. Dividend payments were not subject to withholding tax.

At the April 27, 2001 ordinary shareholders’ meeting, dividends amounting to Ps312,105 (Ps291,075 nominal, equivalent to $0.0875 dollars per share and to $0.4374 dollars per ADR at the exchange rate of Ps9.7025 per dollar) were declared, payable on May 30 of that year. The payment of these dividends was subject to a 7.6925% income tax withholding.

The capital stock balance at December 31, 2002 and 2001, expressed in of thousands of Mexican pesos of December 31, 2002 purchasing power, comprised the following:


Contributions in historical pesos			Ps1,195,221
Cumulative inflation adjustments			9,499,245

Amounts as reported in the consolidated balance sheet			Ps10,694,466

As of December 31, 2002, the Company and its subsidiaries had retained earnings amounting to Ps923,475 appropriated to legal reserves.

Dividends paid from previously taxed retained earnings (which amounted to Ps1,368,189 at December 31, 2002) are not subject to any income tax payable by the Company. Dividends paid from retained earnings not previously taxed are subject to a 51.52% tax payable by the Company.

Capital reductions are accorded the same tax treatment as dividends for any amount exceeding the value of the cash contributions, adjusted for inflation, plus previously taxed earnings and reinvested previously taxed earnings, in accordance with the provisions of the Income Tax Law. Such inflation-indexed contributions amounted to Ps14,655,487 at December 31, 2002.

Note 6 — Income Tax, Asset Tax and Employees’ Statutory Profit Sharing:

The Company and its subsidiaries do not file a consolidated income tax return.

F-18

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

The provisions for income tax, asset tax and employees’ statutory profit sharing charged to income were as follows:



	Years ended December 31,

	2002			2001			2000

Income tax currently payable		(Ps517,162	)		(Ps477,259	)		(Ps193,609	)
Asset tax		(2,927	)		(3,925	)
Employees’ statutory profit sharing		(142,583	)		(105,610	)		(113,849	)

		(662,672	)		(586,794	)		(307,458	)
Deferred income tax		246,938			(5,916	)		(176,285	)
Tax benefit (see last paragraph of this Note)		355,620

		(Ps60,114	)		(Ps592,710	)		(Ps483,743	)

Following is a reconciliation of financial reporting income before income tax and taxable income.



	Years ended December 31,

	2002			2001			2000

Consolidated income before taxes, employees’ statutory profit sharing, equity in associated companies and other items		Ps1,212,184			Ps1,473,845			Ps957,847
Permanent differences:
Net monetary loss for tax purposes		(98,942	)		(78,074	)		(122,082	)
Gain on net monetary position		(59,340	)		(24,225	)		(24,810	)
Timing differences:
Depreciation and other items		501,307			433,810			417,005
Depreciation and accelerated depreciation of fixed asset acquisitions		(216,645	)		(147,151	)		(206,096	)
Excess of cost of sales over inventory purchases		57,116
Deduction of inventory purchases in excess of cost of sales					(99,728	)		(47,634	)
Other items		203,360			(63,825	)		103,011

Combined net taxable income		1,599,040			1,494,652			1,077,241
Current year tax losses		5,957						622

Taxable income		1,604,997			1,494,652			1,077,863
Tax rate (%)		35			35			35

		561,749			523,128			377,252
Restatement for inflation		15,997			10,888			8,768

		577,746			534,016			386,020
Recovery of asset tax, amortization of prior years’ tax losses and other		(60,584	)		(56,757	)		(192,411	)

Provision for income tax		Ps517,162			Ps477,259			Ps193,609

F-19

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

The main temporary differences of Tamsa and its Mexican subsidiaries for which deferred income tax is recognized are analyzed as follows:



	At December 31,

	2002		2001

Inventories		Ps1,172,449		Ps951,249
Properties, plant and equipment — Net		6,048,588		5,586,785
Provisions and allowances		(405,032)		(243,645)
Tax loss carryforwards		(77,720)		(69,095)

		6,738,285		6,225,294
Income tax rate (average rate in 2002)		32%		35%

Deferred income tax		2,180,566		2,178,853
Asset tax carryforwards		(15,277)		(24,696)
Valuation allowance of Riga		5,832

Deferred income tax payable		Ps2,171,121		Ps2,154,157

Deferred income tax of the year was determined as follows:



	At December 31,

	2002		2001

Deferred income tax at the end of the year		Ps2,180,566		Ps2,178,853
Deferred income tax at the beginning of the year		(2,178,853)		(2,331,971)
Application to the loss from holding non-monetary assets		(248,651)		159,034

Deferred income tax of the year		(Ps246,938)		Ps5,916

As a result of modifications to the Income Tax Law approved on January 1, 2002, the current income tax rate of 35% will be reduced by 1% annually beginning in 2003 until it reaches a rate of 32% in 2005.

At December 31, 2002, deferred income tax was calculated applying the income tax rate that will be effective on the date of reversal of the temporary differences; consequently, deferred income tax payable was reduced by Ps156,716. This benefit is included in the provision for income tax of the year 2002, as a part of deferred income tax.

At December 31, 2002, the Company and its subsidiaries had an aggregate Ps77,720 of accumulated tax losses, which can be applied against profits subject to income tax arising in subsequent years, as shown below:


Year of	Restated		Year of
origin	amount		expiration

1998		Ps37,064		2008
2000		18,315		2010
2001		8,282		2011
2002		14,059		2012

		Ps77,720

The foregoing tax loss carryforwards were restated as of December 31, 2002 in accordance with the provisions of the Income Tax Law.

According to the Mexican tax Law, the Company must pay annually the higher of income or asset tax, which is determined based on the average value of assets, less certain liabilities established by Law.

F-20

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

Asset tax payments, when higher than income tax, are refundable and may be carried forward for ten years and credited against future income tax to the extent it exceeds future asset tax. The Company has the right to recover the asset tax paid through 2002 in the aggregate amount of Ps15,277, as shown below.


Year of	Restated		Year of
origin	amount		expiration

1993		Ps1,146		2003
1994		1,350		2004
1995		1,281		2005
1996		2,093		2006
1997		2,018		2007
1998		2,324		2008
1999		2,006		2009
2000		1,596		2010
2001		923		2011
2002		540		2012

		Ps15,277

The asset tax amounts were restated in accordance with the provisions of the Asset Tax Law.

In 2002, 2001 and 2000, the Company recorded provisions of Ps142,583, Ps105,610 and Ps113,849 (Ps138,583, Ps97,804 and Ps74,245 nominal amounts), respectively, corresponding to employees’ statutory profit sharing, which were charged to income of those years.

Tax benefit:

During 2002, Tamsa received a favorable decision in the injunction case brought by Tamsa against the Ministry of Finance regarding tax inequality. This decision increased recoverable income tax loss carryforwards of prior years, the main effect of which was a benefit of Ps355,620 (Ps338,740 nominal), which is included in the provision for income tax, asset tax and employees’ statutory sharing in the statement of income for the year ended December 31, 2002.

Note 7 — Balances and Transactions with Related Parties:

The Company had the following balances with related parties:



	December 31,

	2002			2001

Accounts and notes receivable		Ps1,162,015			Ps877,951
Advance payments for construction in progress		174			7,212
Accounts and notes payable		(335,007	)		(185,933	)
Other accounts payable					(44	)

F-21

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

Transactions with related parties are summarized as follows:



		Years ended December 31,

		2002		2001		2000

Revenues
	Sales of pipe		Ps2,656,521		Ps2,894,687		Ps2,614,283
Rent and services			110,230		68,906		69,966
Interest earned			17,234		12,015		25,647
Purchases and expenses:
Purchase of raw materials and pipe			Ps565,654		Ps220,763		Ps366,174
Purchase of manufacturing equipment, tools and spare parts			8,138		8,052		16,070
Brokerage service commissions			173,589		166,255		119,999
Technical assistance and industrial support			4,116		11,259		30,833
Royalties			51,352		44,268		27,550
Investment in fixed assets			74,351		201,385		94,040
Plant maintenance			47,467		33,410		25,783
Other expenses			254,150		183,255		87,483

The Company maintains several operating agreements with related parties derived from their strategic alliance.

Note 8 — Other Information:

Following are details of certain amounts included in the consolidated balance sheets.

a. Cash and cash equivalents:

The Company places its investments with high-credit-quality financial institutions. At December 31, 2002 and 2001, the Company had cash deposits amounting to Ps4,125 and Ps62,616, respectively, the use of which is restricted to guarantees granted in support of loans to subsidiaries and to cover bid and performance bonds related to export operations.

b. Accounts and notes receivable:



	December 31,

	2002			2001

Customers	Ps	1,245,950		Ps	775,337
Officers and employees		17,892			11,748
Recoverable income tax		6,753
Related parties		1,162,015			877,951
Other		218,778			164,853

		2,651,388			1,829,889
Allowance for doubtful accounts		(68,499	)		(62,275	)

	Ps	2,582,889		Ps	1,767,614

The majority of the Company’s trade accounts receivable are derived from sales to affiliated companies, which make sales to unaffiliated companies that operate in the oil exploration and production industry. The Company performs ongoing credit evaluations of its customers’ financial condition, requires collateral whenever deemed necessary, and maintains allowances for potential credit losses.

F-22

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

c. Inventories:



	December 31,

	2002			2001

Raw materials	Ps	345,856		Ps	362,162
Finished and in-process goods		662,574			779,247
Supplies and spare parts		737,554			621,179

		1,745,984			1,762,588
Allowance for obsolescence		(257,016	)		(234,007	)

	Ps	1,488,968		Ps	1,528,581

d. Prepaid expenses and recoverable taxes:



	December 31,

	2002		2001

Other prepaid taxes	Ps	10,570	Ps	3,538
Debt issuance expenses and other		38,808		28,752
Deferred special maintenance expenses		—		37,242

	Ps	49,378	Ps	69,532

e. Other accounts payable and accrued expenses:



	December 31,

	2002		2001

Income tax payable	Ps	61,430	Ps	95,309
Employees’ statutory profit sharing payable		138,583		50,816
Other taxes payable		127,306		128,513
Interest and commissions payable		1,804		6,400
Related parties		—		44
Other		91,340		60,909

	Ps	420,463	Ps	341,991

Note 9 — Information About Segments and Foreign Operations:

Tamsa operates primarily in one industry segment, the production and sale of seamless steel pipe used mainly in oil exploration and production. The Company generates sales from two geographic areas: Mexico and Venezuela. Sales from Venezuela are generated through Tavsa.

F-23

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

Net sales to individual foreign markets that exceeded 10% of consolidated net sales are as follows:


		2002		2001		2000

Net sales:
	Mexico		Ps2,253,748		Ps2,140,692		Ps2,502,862
	United States		369,328		365,331		264,285
	Nigeria		518,801		210,130		108,043
	Canada		317,029		414,881		447,620
	Venezuela		387,400		1,287,787		1,167,920
	Egypt		135,376		173,909		13,391
	All other		2,746,593		2,306,297		1,958,886

	Total		Ps6,728,275		Ps6,899,027		Ps6,463,007

Sales to companies serving the Mexican oil industry were approximately 15% and 11% of net sales in the years ended December 31, 2002 and 2001, respectively.

Following is a detail of additional disclosures required by International Accounting Standard 14, “Segment Reporting”, regarding geographic areas in which the Company operates:



	As of and for the year ended December 31, 2002

	Mexico			Venezuela			United States		Total


Balance sheet:
Total assets		Ps13,639,089			Ps507,458			Ps173,565		Ps14,320,112
Total liabilities		4,956,602			412,126			—		5,368,728
Income statement:
Depreciation and other non-cash expenses		(481,147	)		(20,160	)		—		(501,307	)
Other information:
Equity in income (loss) of associated companies		23,859			(39,906	)		—		(16,047	)
Capital expenditures		122,926			61,286			—		184,212

The Company has been involved in the following events regarding its foreign commercial activities:

a. In June 1995 the US Department of Commerce (DOC) established compensatory quotas of 23.79% applicable to the Oil Country Tubular Goods (OCTG) exports, which was reduced to 21.79% in July 1996. During the five years in which the antidumping order was applicable, there were three administrative reviews in which no dumping margin was found. In August 2000, Tamsa started a sunset review process on this case. On March 9 and June 15, 2001, the final resolutions of the US International Trade Commission were issued, respectively, ratifying the continuation of the antidumping order. Tamsa appealed these decisions, which it considered as unjustified, before a North American Free Trade Agreement (NAFTA) panel; also, the Mexican government is preparing an appeal to the World Trade Organization.

b. On June 30, 1999, the DOC filed an antidumping complaint against manufacturers of conduction seamless steel pipes of high and standard pressure from Japan, Romania, South Africa, Mexico and the Czech Republic. In July 2000, the final resolution on antidumping was issued, resulting in the imposition of a margin of 15.05%. The American industry agreed that line pipes installed in water deeper than 1,500 feet (458 meters) would not be subject to antidumping restrictions, since American steel manufacturers cannot produce these types of pipes.

c. In March 1999, Tamsa (through the Mexican Ministry of Commerce and Industry, currently the Ministry of Economics) requested the initiation of an antidumping investigation and the application of

F-24

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

dumping margins on seamless steel pipe imports from Japan. The request refers to seamless steel line pipe with a diameter of 16 inches or less. In November 2000, the final resolution was issued establishing compensatory quotas of 99.9%, excluding pipe with a diameter smaller than 4 inches.

d. In July 2002, Tamsa (through the Ministry of Economics) requested the initiation of an antidumping investigation and the application of dumping margins on conduction steel pipe, for non-oil use with a diameter smaller than 18 inches, imported from Russia and Romania. On October 18, 2002, the initiation of the investigation was published. The Company is currently responding to the complaints made by the importers and the manufacturers. The Mexican authorities have 130 business days (ending on April 18, 2003) from the initiation of the investigation, to issue a preliminary resolution, in which compensatory quotas would be established, if the investigation is continued.

e. The Mexican steel industry requested the Ministry of Economics to increase duties on certain steel products from those countries that did not have trade agreements with Mexico, in order to protect itself against imports from those countries that cannot sell their products in the US and divert them to Mexico as an alternative market. On September 5, 2001, the Official Gazette published a decree in which the duties on 41 tariffs were modified, including all non-oil related seamless tubular products, as well as welded steel fittings.

On March 15, 2002, duties for these products were subject to an increase, from 25% to 35%; this increase was motivated by the significant increase in imports from Eastern Europe. On September 24, 2002, the Mexican Government reduced these duties to 25%, which will be effective until September 2003.

Note 10 — Fair Value of Financial Instruments and Other Investments and Commitment:

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash and cash equivalents, short-term investments and accounts and notes receivable — The carrying amounts approximate their fair market value.

Short-term notes payable to banks — The carrying amounts of the Company’s borrowings under its short-term credit agreements approximate their fair value. These liabilities are presented in the consolidated balance sheets at their face value. The interest payable on these liabilities is included in other accounts payable and accrued expenses and the carrying amounts of these liabilities also approximate their fair market values.

Derivative financial instruments — The Company enters into forward contracts in foreign currencies, metals and energy sources.

To hedge the decrease in natural gas market price, on March 2, 2001, the Company entered into an agreement with ENRON North America Corp. (ENRON) for a put option to sell 200,000 million British Thermal Units (BTU) of natural gas monthly, with a strike price of $4.05 dollars per million BTU from March 1, 2002 to December 31, 2003. However, as a result of ENRON’s bankruptcy, there is no reasonable prospect of exercising the Company’s option under this contract, consequently the premium of $2,290 paid to ENRON was written off in the last quarter of 2001.

In order to cover its exposure from the contract signed with Petróleos Mexicanos (PEMEX), mentioned below, and to swap the fixed price from $4 dollars per million BTU established in the contract to the market price, during March 27 and April 5, 2002, the Company entered into two option contracts with Citibank, N. A., New York and JP Morgan Chase Bank to sell 160,000 million BTU of natural gas monthly for each contract, at a strike price of $4 dollars per million BTU when market prices of natural

F-25

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

gas are not lower than $2 dollars and not higher than $4 dollars per million BTU, for the period from May 1, 2002 to February 28, 2003; likewise, for the period from March 1, to December 31, 2003, the strike price is $4 dollars per million BTU when market prices of natural gas are not lower than $2.25 dollars and not higher than $4 dollars per million BTU. Likewise, the Company is obligated to sell natural gas at $4 dollars when market prices are higher than $4 dollars for the period from May 1, 2002 to December 31, 2003. Additionally, the Company is obligated to buy 320,000 million BTU of natural gas monthly at a base price of $2.765 dollars per million BTU, for the period from January 1, 2004 to December 31, 2005. At December 31, 2002, the fair value of these instruments was a liability of Ps29,567, which was charged to income of the year as a part of cost of products sold.

In order to hedge the exchange rate exposures on receivables denominated in euros maturing in January and March, 2003, on December 10 and 13, 2002, the Company entered into two forward contracts to sell EUR8,973 and EUR2,000 at a fixed exchange rate of $1.003 and $1.0194 per EUR, respectively, with maturities at January 31 and March 27, 2003, respectively. At December 31, 2002, the Company recorded a loss provision of $418; however, at the maturity of these forward contracts the Company will realize an exchange gain of $174.

Commitment:

On February 22, 2001, the Company entered into a three-year agreement with PEMEX to receive approximately 296,600 million BTUs of natural gas, on a monthly basis, for the period from January 1, 2001 to December 31, 2003, at a fixed price of $4.0 dollars per million BTU.

Note 11 — Investments in Associated Companies:

Investments in associated companies are as follows:


								Cumulative
					Cumulative			inflation
					equity			and		Investments at
			Historical		in			translation		December
December 31, 2002	% equity		cost		losses			adjustments		31, 2002

- Consorcio Siderurgia Amazonia, Ltd.		14.11		Ps895,726		(Ps1,021,239	)		Ps47,118		(Ps78,395	)
- Convertible debentures of Amazonia		—		214,583		—			245		214,828
- Sidtam, Ltd.		49.00		164,720		(5	)		7,584		172,299
- Complejo Siderúrgico de Guayana, C.A		7.58		66,317		—			52,622		118,939
- Other		—		46,092		35,453			8,481		90,026

				Ps1,387,438		(Ps985,791	)		Ps116,050		Ps517,697

F-26

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000


									Cumulative
						Cumulative			inflation
						equity			and			Investments at
			Historical			in			translation			December
December 31, 2002	% equity		cost			losses			adjustments			31, 2001

- Consorcio Siderurgia Amazonia, Ltd.		14.11		Ps895,726			(Ps836,381	)		Ps122,531			Ps181,876
- Convertible debentures of Amazonia		—		214,583			—			(13,274	)		201,309
- Valuation allowance for investment in Amazonia and convertible debentures		—		(137,134	)		—			(7,818	)		(144,952	)
- Sidtam, Ltd.		49.00		164,720			(5	)		(3,260	)		161,455
- Complejo Siderúrgico de Guayana, C.A		7.58		66,317			—			52,622			118,939
- Goodwill in shares of TAVSA — Net		—		36,662			—			2,090			38,752
- Goodwill in shares of RIGA		—		12,979			—			1,048			14,027
- Other		—		25,171			11,595			6,179			42,945

				Ps1,279,024			(Ps824,791	)		Ps160,118			Ps614,351

Consorcio Siderurgia Amazonia, Ltd.

On January 27, 1998, Consorcio Siderurgia Amazonia, Ltd. (Amazonia), of which Tamsa owned 12.5% through its wholly-owned subsidiary Tamsider LLC, acquired 70% of CVG Siderúrgica del Orinoco, C. A. (Sidor), a Venezuelan company, for $1,202,000. The purchase price was subsequently reduced by $150,000.

The share purchase agreement contains certain covenants for Amazonia and its shareholders, for a period of five years, that should be guaranteed by Amazonia’s shareholders to the Fondo de Inversiones de Venezuela (currently The Venezuelan Bank of Economic and Social Development) and Corporacion Venezolana de Guayana (CVG) for up to $150,000. Covenants include the obligations to continue with Sidor’s operations, to supply the requirements of the Venezuelan market, to make certain capital investments and to manage the labor force, as well as the obligation to maintain majority ownership of Sidor. This guarantee would be reduced to $125,000 in 2001 and to $75,000 in 2002, if there were no execution of the guarantee in the immediately preceding year. At December 31, 2002, Tamsa’s maximum guarantee was $9,375; this guarantee expired in January 2003.

Additionally, the stockholders of Amazonia entered into an agreement under which it and its stockholders were jointly liable to the Venezuelan government for certain debt of Sidor amounting to $602,800. This guarantee was limited only to any interest due and unpaid during the years ended December 31, 1998 and 1999; however, from the third year onwards it also covered any principal amounts due and unpaid.

On February 23, 2000, Amazonia and Sidor completed the agreements with their creditors to restructure their respective debts. The restructuring agreement with the creditors of Amazonia and of Sidor required additional contributions of $300,000 by the stockholders of Sidor, of which $210,000 were provided indirectly by the stockholders of Amazonia through the subscription of subordinated convertible debt and through capital contributions, and the Company was granted a two-year grace period before commencing repayments of its restructured liabilities.

Tamsa’s participation, via Tamsider LLC, was $36,144, which included capital and interest due on prior loans to Sidor of $18,866. A portion of the funds, $18,137, was contributed as capital stock,

F-27

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

increasing Tamsider LLC’s equity in Amazonia from 12.5% to 14.1%, and the remainder as subscription of convertible debentures of subordinated debt of $18,007 issued by Amazonia. Tamsider LLC’s participation included the portion corresponding to Siderúrgica Venezolana Sivensa, S. A., a stockholder of Amazonia, which was not in a position to contribute additional funds.

As a result of the restructuring, Amazonia had debt of approximately $245,000 (excluding the subordinated convertible debt detailed later in this Note) and Sidor’s debt was approximately $1,200,000. Additionally, Sidor agreed to assign a part of its fixed assets to a trust designating its creditors as beneficiaries for up to $827,000. As of December 31, 2002, Amazonia and Sidor had debt of approximately $313,000 and $1,580,000, respectively. Tamsider LLC’s shares in Amazonia continue to be pledged to Amazonia’s creditors.

As a consequence of the worldwide steel industry crisis, the slow-down in the financial markets, the adverse economic and political situation in Venezuela and other adverse factors, at December 31, 2002, Sidor was in default on certain contractual obligations under the restructuring agreement with its creditors and The Venezuelan Investment Fund, such as: (i) payment of interest due on December 18, 2001, (ii) the deposit of payments of interest, in reserve accounts, on certain debts as stated in the restructuring agreements, and (iii) meeting certain financial ratios. As a result of this default, Sidor’s debt may be accelerated at the option of its creditors.

Amazonia and Sidor have initiated in December 2001 negotiations with their creditors and The Venezuelan Investment Fund to restructure their debt.

Tamsa accounts for its equity in the losses of Amazonia, through its subsidiary, by translating Amazonia’s financial statements expressed in US dollars at the balance sheet exchange rate. Additionally, Tamsa recognized a gain on net monetary position corresponding to Amazonia of Ps77,894 and Ps41,572 during 2002 and 2001, respectively, which is included in the equity in loss of associated companies in accordance with Statement B-15 issued by the MIPA.

Due to Sidor’s financial situation, as a result of the events mentioned above, at December 31, 2001, Tamsider LLC recorded a valuation allowance of Ps154,688 ($15,000) to reduce the value of its investment in Amazonia and the subordinated convertible debentures, which was applied against the equity in the result of Amazonia of the year 2002. Tamsa’s initial investment, made through Tamsider LLC, of $87,800 and its additional capital contribution of $18,137 have been reduced to Ps136,433 ($13,230) at December 31, 2002, due to the recognition of Amazonia’s losses using the equity method of accounting. Assets of Tamsider LLC comprise Amazonia’s shares and the subordinated convertible debentures.

At December 31, 2002, Tamsider LLC had a maximum exposure of $98,799 corresponding to guarantees covering Sidor’s debt with The Venezuelan Bank of Economic and Social Development (formerly The Venezuelan Investment Fund).

Note 12 — Reconciliation Between Mexican (Mexican GAAP) and United States (US GAAP) Generally Accepted Accounting Principles:

The Company’s consolidated financial statements are prepared in accordance with Mexican GAAP, which differ in certain respects from US GAAP. The Mexican GAAP consolidated financial statements include the effects of inflation as provided for under Statement B-10, “Recognition of the Effects of Inflation on Financial Information”. The application of this statement represents a comprehensive measure of the effects of price level changes in the Mexican economy, which for many years was hyperinflationary, and is considered to result in a more meaningful presentation than historical cost-based financial reporting for both Mexican and U.S. accounting purposes.

F-28

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

Therefore, the following reconciliations to US GAAP do not include the reversal of such inflationary effects, except for the valuation of machinery and equipment of foreign origin since 1997, as explained later in this Note.

The main accounting differences between Mexican GAAP and US GAAP are itemized in the reconciliations below (net of any price-level gain or loss), to show their effects on net income and shareholders’ equity. Significant US GAAP disclosure requirements that do not represent quantifiable accounting differences are itemized and explained following the reconciliations.

Reconciliation of consolidated net income



	Year ended December 31,

	See
	Sub-Note			2002			2001			2000

Net income corresponding to majority shareholders under Mexican GAAP					Ps1,177,049			Ps574,947			Ps439,319
Depreciation of machinery and equipment of foreign origin		(a	)		51,122			(17,248	)		(31,085	)
Deferred income taxes		(b	)		(8,682	)		72,709			103,948
Deferred employees’ statutory profit sharing		(b	)		10,390			(17,084	)		21,377
Revenue recognition		(c	)		91,965			(28,893	)		(101,169	)
Purchase accounting differences affecting Company’s investment in Amazonia, associated company		(e	)		—			109,631			5,704
Purchase accounting and pre-operating expense differences affecting the acquisition of TAVSA, subsidiary — Net of amortization		(e	)		41,917			19,376			27,476
Minority interest effect of adjustments					(12,575	)		(5,812	)		(8,243	)
Interest capitalized in construction in progress		(g	)		30,447			27,140			43,209

Net income under US GAAP					Ps1,381,633			Ps734,766			Ps500,536

Weighted average number of shares outstanding					339,284,120			339,284,120			339,284,120

Basic earnings per share computed under
US GAAP (in Mexican pesos)					Ps4.07			Ps2.17			Ps1.48

F-29

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

Reconciliation of comprehensive net income

Statement of Financial Accounting Standards No. 130, “Reporting Comprehensive Income” (SFAS 130), establishes rules for the reporting of comprehensive income and its components. Comprehensive income consists of net income, translation adjustments related to foreign subsidiaries and loss from holding non-monetary assets. The following table summarizes the components of comprehensive income:



	Years ended December 31,

	2002			2001			2000

Net income under US GAAP		Ps1,381,633			Ps734,766			Ps500,536
Cumulative translation adjustment related to foreign subsidiaries		(64,548	)		(112,056	)		(149,567	)
Gain (loss) from holding non-monetary assets		145,409			(178,380	)		(121,016	)

Comprehensive net income under US GAAP		1,462,494			444,330			229,953
Cumulative comprehensive loss at the beginning of the year under US GAAP		(7,659,708	)		(8,104,038	)		(8,333,991	)

Cumulative comprehensive loss at the end of the year under US GAAP		(Ps6,197,214	)		(Ps7,659,708	)		(Ps8,104,038	)

Reconciliation of shareholders’ equity



	At December 31,

	See
	Sub-
	Note			2002			2001			2000

Shareholders’ equity under Mexican GAAP					Ps8,963,714			Ps7,598,793			Ps7,755,730
Restatement of machinery and equipment of foreign origin		(a	)		2,537,969			3,174,297			2,885,915
Accumulated depreciation of machinery and equipment of foreign origin		(a	)		(68,109	)		(119,231	)		(101,982	)
Deferred income taxes		(b	)		(819,261	)		(1,059,238	)		(972,911	)
Deferred employees’ statutory profit sharing		(b	)		(863,317	)		(873,707	)		(856,624	)
Revenue recognition		(c	)		(38,098	)		(130,063	)		(101,169	)
Purchase accounting differences affecting Company’s investment in Amazonia, associated company		(e	)								(109,631	)
Purchase accounting and pre-operating expense differences affecting the acquisition of Tavsa, subsidiary — Net of accumulated amortization		(e	)					(41,917	)		(61,293	)
Minority interest effect of adjustments								12,575			18,388
Interest capitalized in construction in progress		(g	)		131,834			101,387			74,248

Shareholders’ equity under US GAAP					Ps9,844,732			Ps8,662,896			Ps8,530,671

Analysis of changes in shareholders’ equity under US GAAP


	2002			2001			2000

Balance at beginning of year		Ps8,662,896			Ps8,530,671			Ps8,620,894
Net income under US GAAP		1,381,633			734,766			500,536
Gain (loss) from holding non-monetary assets		145,409			(178,380	)		(121,016	)
Translation adjustment of foreign subsidiaries		(64,548	)		(112,056	)		(149,567	)
Dividends paid		(280,658	)		(312,105	)		(320,176	)

Balance at year end		Ps9,844,732			Ps8,662,896			Ps8,530,671

F-30

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

Significant differences between Mexican GAAP and US GAAP

a. Restatement of machinery and equipment of foreign origin

In accordance with the Fifth Amendment to Statement B-10, commencing in 1997 the Company elected to use inflationary factors of the country of origin applied to the acquisition costs expressed in the currency of origin, converted to Mexican pesos at the year-end exchange rates. Under US GAAP, this methodology does not comply with Rule 3-20 of the Securities and Exchange Commission (SEC)’s Regulation S-X for presenting price level adjusted financial statements, and consequently, the Company has determined the effects of the machinery and equipment of foreign origin.

The difference between the machinery and equipment of foreign origin restatement determined in accordance with the Fifth Amendment to Statement B-10 compared to the restatement using the NCPI would have resulted in a higher value of these assets of Ps2,469,860 (net of accumulated depreciation of Ps68,109) at December 31, 2002, and Ps3,055,066 (net of accumulated depreciation of Ps119,231) at December 31, 2001.

b. Deferred income tax and employees’ statutory profit sharing

The Company follows the provisions of revised Statement D-4, “Accounting Treatment of Income Tax, Asset Tax, and Employees Profit Sharing”. The provisions of Statement D-4 require the full asset and liability method, requiring the recognition of the deferred tax effects of all temporary differences between accounting and tax values of assets and liabilities.

Under US GAAP, the Company follows Statement of Financial Accounting Standards (SFAS) No. 109, “Accounting for Income Taxes” (SFAS 109) to account its deferred income tax and profit sharing. The provisions of SFAS 109 require deferred income tax and profit sharing to be recognized for all temporary differences including the benefits from utilizing tax loss carryforwards and asset tax credits in the year in which the loss or credits arise (subject to a valuation allowance in respect of any tax benefits not expected to be realized). The subsequent realization of these benefits does not affect income.

The temporary differences under SFAS 109 are determined based on the difference between the indexed tax-basis amount of the asset or liability and the related restated amount reported in the financial statements.

The deferred income tax expense or benefit is calculated as the difference between: a) the deferred tax assets and liabilities at the end of the current period determined as indicated above, and b) the deferred tax assets and liabilities reported at the end of the prior period remeasured to units of current general purchasing power at the end of the current period. The deferred employees’ statutory profit sharing expense or benefit is calculated similarly.

F-31

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

The significant components of income tax expense under US GAAP were as follows:



	Year ended December 31,

	2002			2001			2000

Current tax		(Ps161,542	)		(Ps477,259	)		(Ps193,609	)
Deferred tax		238,256			66,793			(72,336	)

Total income tax		76,714			(410,466	)		(265,945	)

Current employees’ statutory profit sharing		(142,583	)		(105,610	)		(113,849	)
Deferred employees’ statutory profit sharing		10,390			(17,084	)		21,377

Total employees’ statutory profit sharing *		(132,193	)		(122,694	)		(92,472	)

Asset tax		(2,927	)		(3,925	)

Total income tax, employees’ statutory profit sharing and asset tax		(Ps58,406	)		(Ps537,085	)		(Ps358,417	)


	*	Under US GAAP employees’ statutory profit sharing is classified as a component of operating expenses.

F-32

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

The income tax and profit sharing effects of significant items comprising the Company’s net deferred income tax and profit sharing assets and liabilities under US GAAP are as follows:



			December 31,

			2002			2001

Deferred income tax liabilities
Current:
	Inventories			Ps536,369			Ps489,399
	Other			10,223			3,221

				546,592			492,620
	Property, plant and equipment			2,773,451			3,043,671

		Total		3,320,043			3,536,291

Deferred income tax assets
Current:
	Asset tax carryforwards			(13,970	)		(27,956	)
	Tax loss carryforwards			(78,514	)		(54,319	)
	Provisions			(99,206	)		(50,743	)
	Revenue recognition			(12,953	)		(45,522	)

				(204,643	)		(178,540	)
Noncurrent:
	Other			(202,206	)		(205,853	)

				(406,849	)		(384,393	)

Valuation allowance for deferred income tax of Tavsa				77,188			61,497

Net deferred income tax liability under US GAAP				2,990,382			3,213,395
Net deferred income tax liability under Mexican GAAP				2,171,121			2,154,157

US GAAP adjustment				Ps819,261			Ps1,059,238

Deferred employees’ statutory profit sharing liability
Current:
	Inventories			Ps130,582			Ps139,733
	Other			2,534			921

				133,116			140,654
Noncurrent:
	Property, plant and equipment			803,215			813,780

				936,331			954,434

Deferred employees’ statutory profit sharing liability
Current:
	Revenue recognition			(3,810	)		(13,006	)
	Provisions			(12,940	)		(8,904	)

				(16,750	)		(21,910	)
Noncurrent:
	Other			(56,264	)		(58,817	)

				(73,014	)		(80,727	)

Net deferred employees’ profit sharing liability under US GAAP				Ps863,317			Ps873,707

F-33

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

c. Revenue recognition

In December 1999, the SEC issued SAB No. 101, “Revenue recognition in Financial Statements” which summarizes the SEC staff’s interpretation of US GAAP related to revenue recognition and classification.

In late 1998, the Company initiated a stocking program that provides just-in-time inventory services to its customers around the world. Under Mexican GAAP, revenues are recognized when materials are shipped to affiliated companies that deliver the materials to the customers when requested. Payments are subsequently made to the Company once the customers have paid the affiliated companies for the materials supplied under the terms of the agreements. Based on the guidance provided in SAB 101, revenue would not be recognized until the materials have been delivered to the customers and, accordingly, the Company has retroactively adjusted its revenues and costs of sales for materials that had not been delivered to its customers as of December 31, 2002, 2001 and 2000.

The effect of prior years has been reported as a cumulative effect of change in accounting principle at December 31, 2000. Provided below is a summary of the revenues and costs of sales which would be deferred as of December 31, 2002, 2001 and 2000 under US GAAP.

December 31,

2002

2001

2000

Revenues

Ps150,884

Ps282,746

Ps289,054

Cost of goods sold

112,786

152,683

187,885

Ps38,098

Ps130,063

Ps101,169

d. Use of estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements. Actual results could differ from those estimates.

e. Accounting for workforce reduction programs and pre-operating expenses

As explained in Note 11, the Company invested in two companies in Venezuela in 1998 in connection with the privatization of companies in the Venezuelan steel industry. As part of these investments, the Company and its partners developed business plans which contemplated workforce reductions in both companies.

As a result of the Company’s plans to reduce the workforces in these companies, the liabilities associated with the reductions were accrued by Sidor and Tavsa as of the date of the acquisitions, which resulted in additional goodwill under Mexican GAAP. During the last quarter of 2001, due to the adverse financial condition of Sidor, the Company wrote off the remaining balance. For US GAAP purposes, however, due to the voluntary nature of the workforce reduction programs, as required by Venezuelan labor laws and the terms of the privatization agreements, the costs associated with these programs would be considered as an expense of the period in which the employees accepted the termination offers.

Due to the start-up nature of the operations at Tavsa the Company deferred certain start-up costs. At December 31, 2002, the Company had amortized all deferred pre-operating expenses. At December 31, 2001 and 2000, deferred pre-operating expenses amounted to Ps41,917 and Ps61,293 (Ps29,342 and Ps42,905 net of minority interest), respectively. Under US GAAP start-up costs are expensed as incurred.

F-34

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

f. Additional information about termination benefits

Additional disclosures required by SFAS 132, “Employers’ Disclosures about Pensions and Other Postretirement Benefits-an amendment of FASB Statements No. 87, 88 and 106” are as follows:



	December 31,

	2002			2001


Change in benefit obligation:
Benefit obligation at the beginning of the year		Ps12,004			Ps9,787
Service cost		729			652
Interest cost		523			432
Actuarial losses		1,715			1,774
Benefits paid		(1,181	)		(1,071	)
Inflation effects		(263	)		430

Net liability position at the end of the year		Ps13,527			Ps12,004



	December 31,

	2002			2001


Change in plan assets:
Fair value of plan assets at the beginning of the year		Ps2,208			Ps1,454
Actual return on plan assets		37			815
Inflation effects		(118	)		(61	)

Fair value of plan assets at the end of the year		Ps2,127			Ps2,208

g. Capitalization of interest

Under Mexican GAAP, interest can be capitalized on loans identified with construction projects.

Under US GAAP, interest is capitalized based upon total interest incurred in relation to additions to construction in progress. During 2002, 2001 and 2000, the Company would have capitalized Ps38,032, Ps40,174 and Ps47,199, respectively, of interest under US GAAP.

The adjustment for capitalized interest is presented net of the effects of inflation and its corresponding depreciation on a straight-line basis. Depreciation of capitalized interest amounted to Ps7,585 in 2002, Ps13,034 in 2001 and Ps3,990 in 2000.

h. Equity method of accounting for Amazonia

Under US GAAP, a company normally uses the equity method when it owns more than 20% but less than a controlling interest in an investee, provided that it can demonstrate that it has the ability to exercise significant influence over the investee’s operating and financial policies.

At December 31, 2002 and 2001, Tamsa had a 14.1% interest in Amazonia; however, it has elected to account for this investment using the equity method since Tamsa forms part of the Techint Group, which had a combined interest of 39.5% in Amazonia at December 31, 2002 and 2001.

i. Statement of cash flows

Under US GAAP, a statement of cash flows is prepared based on the provisions of SFAS 95, “Statement of Cash Flows”. This statement does not provide specific guidance for the preparation of cash flows statements for price-level-adjusted financial statements. Cash flows from operating, investing and financing activities in the following statement of cash flows have been adjusted for the effects of inflation

F-35

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

on monetary items. The effects of exchange rate changes and inflationary effects on cash have also been segregated from other cash flow activities.



		Year ended December 31,

		2002			2001			2000

Resources provided by operations:
	Net income under US GAAP		Ps1,381,633			Ps734,766			Ps500,536

Adjustments to reconcile net income to resources provided by operating activities:
Monetary gain			(59,340	)		(24,225	)		(24,810	)
Minority interest			(28,451	)		9,501			(9,583	)
Depreciation and other			487,338			451,059			448,089
Equity in loss of associated companies			16,047			181,299			46,906
Deferred income taxes and employees’ statutory profit sharing			(248,646	)		(49,709	)		50,959
Exchange loss			224,870			46,336			89,518
(Increase) decrease in accounts and notes receivable			(995,203	)		111,617			(870,298	)
Decrease (increase) in inventories			207,599			(199,577	)		37,581
(Increase) decrease in prepaid expenses and recoverable taxes			(36,181	)		207,043			140,623
Increase (decrease) in trade accounts payable			333,745			(237,493	)		315,584
Increase (decrease) in other accounts payable and accrued expenses			109,350			(3,067	)		152,906

Total adjustments			11,128			492,784			377,475

Resources provided by operations			1,392,761			1,227,550			878,011

Resources used in investing activities:
Purchase of associated companies			(2,740	)		(52,606	)		(24,667	)
Purchase of convertible subordinate debentures			—			—			(185,566	)
Purchase of property, plant and equipment			(222,244	)		(878,326	)		(495,305	)

Resources used in investing activities			(224,984	)		(930,932	)		(705,538	)

Resources used in financing activities:
Increase in short-term debt			399,964			633,462			1,006,715
Decrease in short-term debt			(340,195	)		(742,955	)		(1,873,673	)
Increase in long-term debt			—			1,342,410			1,047,969
Repayments of long-term debt			(53,892	)		(969,490	)
Dividends paid			(280,658	)		(312,105	)		(320,176	)

Resources used in financing activities			(274,781	)		(48,678	)		(139,165	)

Net increase in cash and equivalents			892,996			247,940			33,308
Effect of exchange rate changes and inflationary effects on cash and equivalents			(61,192	)		40,238			49,238
Cash and cash equivalents at beginning of year (nominal figures)			556,885			300,454			249,020

Cash and cash equivalents at end of year			Ps1,388,689			Ps588,632			Ps331,566

Supplemental cash flow information:
Interest paid net of interest capitalized			Ps50,712			Ps101,459			Ps143,108

Income tax and asset tax paid			Ps280,167			Ps370,392			Ps318,132

Other non-cash activities:
Investment in associated companies through the capitalization of accounts receivable			Ps18,659			Ps8,266			Ps194,418

F-36

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

j. Recently issued accounting pronouncements

In July 2001, the Financial Accounting Standards Board (FASB) issued SFAS No. 141, “Business Combinations” (SFAS 141) which supersedes APB Opinion No. 16, “Business Combinations” and amends or supersedes a number of related interpretations of APB 16. The statement is effective for all business combinations initiated after June 30, 2001 and for all business combinations accounted for by the purchase method that are completed after June 30, 2001. SFAS 141 addresses financial accounting and reporting for business combinations, eliminates the pooling-of-interests method of accounting for business combinations, and prescribes the initial recognition and measurement of goodwill and other intangible assets, accounting for negative goodwill and the required disclosures in respect of business combinations. The adoption of SFAS 141 did not have a material effect on the consolidated financial statements.

Also in July 2001, the FASB issued SFAS No. 142, “Goodwill and Other Intangible Assets” (SFAS 142), which supersedes APB Opinion No. 17, “Intangible Assets”. SFAS 142 addresses how intangible assets that are acquired individually or with a group of other assets (but not those acquired in a business acquisition) should be accounted for in financial statements upon their acquisition. SFAS 142 also addresses how goodwill and other intangible assets should be accounted for after they have been initially recognized in the financial statements. The provisions of SFAS 142 are required to be applied starting with fiscal years beginning after December 15, 2001. SFAS 142 is required to be applied at the beginning of an entity’s fiscal year and to be applied to all goodwill and other intangible assets recognized in its financial statements at that date. The adoption of SFAS 142 did not have a material effect on the consolidated financial statements.

In June 2001, the FASB issued SFAS No. 143, “Accounting for Asset Retirement Obligations” (SFAS 143). SFAS 143 requires the recognition of a liability for the legal obligations associated with the retirement of a tangible long-lived asset that results from the acquisition, construction and/or normal operation of the asset. The liability is recognized at fair value in the period in which it is incurred if a reasonable estimate of fair value can be made. A corresponding asset retirement cost is added to the carrying value of the long-lived asset and is depreciated to expense using a systematic and rational method over its useful life. SFAS 143 is effective for fiscal years beginning after June 15, 2002. Upon initial adoption, a liability is recognized for existing asset retirement obligations and the associated asset retirement cost is capitalized as an increase to the carrying value of the asset. The recognized liability and asset are adjusted for cumulative accretion and accumulated depreciation, respectively, from the time period when the asset retirement obligation would have originally been recognized had this statement been in effect to the date of initial adoption. The cumulative effect of initial adoption of SFAS 143 is recorded as a change in accounting principle. Management is currently evaluating the impact that the adoption of SFAS 143 will have on the consolidated financial statements.

In August 2001, the FASB issued SFAS No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets” (SFAS 144). SFAS 144 supersedes SFAS No. 121, “Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to be Disposed of” and the accounting and reporting provisions of APB Opinion No. 30, “Reporting the Results of Operations — Reporting the Effects of Disposal of a Segment of a Business, and Extraordinary, Unusual and Infrequently Occurring Events and Transactions”. SFAS 144 retains the fundamental provisions of SFAS 121 for recognition and measurement of the impairment of long-lived assets to be held and used, but resolves a number of implementation issues and establishes a single accounting model for assets to be disposed of. SFAS 144 also retains the requirements to report discontinued operations separately from continuing operations and extends that reporting to a component of an entity that either has been disposed of by sale, abandonment or distribution to owners or is classified as held for sale. The provisions of SFAS 144 are effective for financial statements issued for fiscal years beginning after December 15, 2001 and their interim periods.

F-37

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

The provisions of SFAS 144 for long-lived assets to be disposed of by sale or otherwise are effective for disposal activities initiated after the effective date of SFAS 144 or after its initial application. The adoption of SFAS 144 did not have a material effect on the consolidated financial statements.

In April 2002, the FASB issued SFAS No. 145, “Rescission of SFAS Nos. 4, 44, and 64, Amendment of SFAS 13, and Technical Corrections as of April 2002.” SFAS 145 rescinds SFAS No. 4, “Reporting Gains and Losses from Extinguishment of Debt,” SFAS No. 44, “Accounting for Intangible Assets of Motor Carriers,” and SFAS 64, “Extinguishments of Debt Made to Satisfy Sinking-Fund Requirements.” As a result, gains and losses from extinguishment of debt will no longer be classified as extraordinary items unless they meet the criteria of unusual or infrequent as described in Accounting Principles Boards Opinion 30, “Reporting the Results of Operations — Reporting the Effects of Disposal of a Segment of a Business, and Extraordinary, Unusual and Infrequently Occurring Events and Transactions.” In addition, SFAS 145 amends SFAS No. 13, “Accounting for Leases,” to eliminate an inconsistency between the required accounting for sale-leaseback transactions and the required accounting for certain lease modifications that have economic effects that are similar to sale-leaseback transactions. SFAS 145 also amends other existing authoritative pronouncements to make various technical corrections, clarify meanings, or describe their applicability under changed conditions. SFAS 145 is effective for fiscal years beginning after May 15, 2002. Management is currently evaluating the impact that the adoption of SFAS 145 will have on the consolidated financial statements.

In June 2002, the FASB issued SFAS No. 146, “Accounting for Costs Associated with Exit or Disposal Activities” (“SFAS 146”). The issuance of SFAS 146 nullifies the former guidance provided by the Emerging Issues Task Force (“EITF”) Issue No. 94-3, “Liability Recognition for Certain Employee Termination Benefits and Other Costs to Exit an Activity (including Certain Costs Incurred in a Restructuring)” (“EITF 94-3”). SFAS 146 requires the recognition of a liability for costs associated with exit or disposal activity when the liability is incurred, rather than on the date commitment to an exit or disposal plan. SFAS 146 is effective for liabilities, related to exit or disposal activities, which are incurred after December 31, 2002, while earlier application is encouraged. Management is currently evaluating the impact that the adoption of SFAS 146 will have on the consolidated financial statements.

In October 2002 the FASB issued SFAS No. 147 “Acquisitions of Certain Financial Institutions” (SFAS 147), an amendment of SFAS No. 72 and 144 and FASB Interpretation No. 9. SFAS 147 provides guidance for (1) the accounting and reporting for the acquisition of all or part of a financial institution, excluding those transactions between two or more mutual enterprises and (2) accounting for the impairment or disposal of long-term customer relationship intangible assets of financial institutions, including the long-term customer-relationship intangibles of mutual enterprises. The provisions of SFAS 147 regarding the method of accounting to be used for acquisitions of financial institutions are effective for acquisitions for which the date of the acquisition is on or after October 1, 2002. The guidance for the impairment or disposal of long-term customer relationship intangible assets of financial institutions, including mutual enterprises, is effective on October 1, 2002. The Company management believes that the adoption of SFAS 147 will not have a material impact on the consolidated financial statements.

In December 2002, the FASB issued SFAS No. 148, “Accounting for Stock-Based Compensation — Transition and Disclosure — an amendment of FAS 123” (SFAS 148). As the title of the standard implies, it is fairly limited in its scope, however it will have implications for all entities that issue stock-based compensation to their employees. The standard is intended to encourage the adoption of the accounting provisions of SFAS 123. It is also intended to address constituent concerns about the so-called “ramp-up effect” on net income that resulted from the application of the transition guidance originally required by SFAS 123. The transition and annual disclosure provisions of SFAS 148 are effective for fiscal years ending after December 15, 2002. Early application is permitted, provided that the entity has not yet issued its

F-38

TUBOS DE ACERO DE MEXICO, S. A. AND SUBSIDIARIES

(a subsidiary of Tenaris, S. A.)

NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

December 31, 2002, 2001 AND 2000

fiscal 2002 financial statements. The new interim disclosure provisions are effective for the first interim period beginning after December 15, 2002. The Company management believes that the adoption of SFAS 148 will not have a material impact on the consolidated financial statements.



Guillermo Vogel H.		Claudio Gugliuzza
Vice Chairman of the Board		Administrative Director

F-39

STATUTORY AUDITOR’S REPORT

February 21, 2003

To the General Meeting of Shareholders of Tubos de Acero de México, S.A.

In my capacity as Statutory Auditor and in accordance with the Article 166 of the General Corporations Law and with the company’s by laws, I submit my report upon the correctness, sufficiency and fairness of the financial information that the Board of Directors has presented to your attention in relation with the Company’s operations for the year ended December 31, 2002.

I attended the stockholders’ meetings and the meetings of the Board of Directors to which I have been called, and obtained from Management the information on operations, documentation and records that I considered it necessary to examine. My review has been performed in accordance with auditing standards generally accepted in Mexico.

In my opinion, the accounting and reporting policies and criteria followed by the Company and applied by Management in preparing the financial information presented to this Meeting are appropriate and adequate and have been applied on a basis consistent with that of the previous year; therefore, such information correctly, fairly and adequately presents the financial position of Tubos de Acero de México, S. A. and subsidiaries at December 31, 2002 and the results of its operations, the changes in its stockholders’ equity and the changes in its financial position for the year then ended, in conformity with accounting principles generally accepted in Mexico.

(-s- Enrique Osorno Heinze)

F-40

CORPORATE INFORMATION

Address

Headquarters and Industrial Plant

Km. 433.7 Carretera

México—Jalapa—Veracruz

Veracruz, México

Tel: (52-229) 989-1100

Fax: (52-229) 989-1600

Mexico City Office

Edificio Parque Reforma

Campos Elíseos 400, Piso 17

11560 México, D.F.

Tel: (52-55) 5282-9900

Fax:(52-55) 5282-9961

Stock Information

Bolsa Mexicana de Valores, S.A. de C.V.

TAMSA

American Stock Exchange:

TAM

Depositary Bank

Morgan Guaranty Trust of New York

CUSIP Number 898592506

Contacts for Corporate Information

José Ramón Calderón (jrcalderon@tamsa.com.mx)

Tel: (52-55) 5282-9900

Fax: (52-55) 5282-9961

Web page

www.tamsa.com.mx


Headquarters and Industrial Plant	www.tamsa.com.mx	Mexico City Office


Km. 433.7 Carretera	Edificio Parque Reforma


México-Jalapa-Veracruz	Campos Elíseos 400, piso 17


Veracruz, México	11560 México, D.F.


Tel: (52-229) 989-1100	Tel: (52-55) 5282-9900


Fax: (52-229) 989-1600	Fax: (52-55) 5282-9961

Tubos de Acero de México, S.A.

/s/ Cecilia Bilesio

Cecilia Bilesio
Corporate Affairs

TUBES OF STEEL OF MEXICO SA 6-K/A