UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 Hydril Company -------------------------------------------------------------------------------- (Name of Issuer) Common Stock, par value $0.50 -------------------------------------------------------------------------------- (Title of Class of Securities) 448774109 -------------------------------------------------------------------------------- (CUSIP Number) Mr. Fernando R. Mantilla Av. Leandro N. Alem 1067, 27th Floor 1001--Buenos Aires, Argentina (54-11) 4018-2254 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) February 11, 2007 ----------------------------------------- (Date of Event which Requires Filing of this Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box. NOTE: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 (the "Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). CUSIP No. 448774109 Page 2 of 11 Pages -------------------------------------------------------------------------------- NAME OF REPORTING PERSONS 1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS Rocca & Partners S.A. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [_] (See Instructions) (B) [_] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) N/A -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) [_] -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION British Virgin Islands -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 0 ---------------------------------------------------------- 8 SHARED VOTING POWER NUMBER OF SHARES BENEFICIALLY OWNED 1,035,208 BY EACH REPORTING ---------------------------------------------------------- PERSON WITH 9 SOLE DISPOSITIVE POWER 0 ---------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,035,208 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) [_] -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.38% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- Page 2 of 11 Pages CUSIP No. 448774109 Page 3 of 11 Pages -------------------------------------------------------------------------------- NAME OF REPORTING PERSONS 1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS San Faustin N.V. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [_] (See Instructions) (B) [_] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) N/A -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) [_] -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Netherlands Antilles -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 0 ---------------------------------------------------------- 8 SHARED VOTING POWER NUMBER OF SHARES BENEFICIALLY OWNED 1,035,208 BY EACH REPORTING ---------------------------------------------------------- PERSON WITH 9 SOLE DISPOSITIVE POWER 0 ---------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,035,208 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) [_] -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.38% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- Page 3 of 11 Pages CUSIP No. 448774109 Page 4 of 11 Pages -------------------------------------------------------------------------------- NAME OF REPORTING PERSONS 1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS I.I.I. Industrial Investments Inc. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [_] (See Instructions) (B) [_] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) N/A -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) [_] -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 0 ---------------------------------------------------------- 8 SHARED VOTING POWER NUMBER OF SHARES BENEFICIALLY OWNED 1,035,208 BY EACH REPORTING ---------------------------------------------------------- PERSON WITH 9 SOLE DISPOSITIVE POWER 0 ---------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,035,208 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) [_] -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.38% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- Page 4 of 11 Pages CUSIP No. 448774109 Page 5 of 11 Pages -------------------------------------------------------------------------------- NAME OF REPORTING PERSONS 1 I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS Tenaris S.A. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (A) [_] (See Instructions) (B) [_] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 SOURCE OF FUNDS (See Instructions) N/A -------------------------------------------------------------------------------- 5 CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e) [_] -------------------------------------------------------------------------------- 6 CITIZENSHIP OR PLACE OF ORGANIZATION Luxembourg -------------------------------------------------------------------------------- 7 SOLE VOTING POWER 0 ---------------------------------------------------------- 8 SHARED VOTING POWER NUMBER OF SHARES BENEFICIALLY OWNED 1,035,208 BY EACH REPORTING ---------------------------------------------------------- PERSON WITH 9 SOLE DISPOSITIVE POWER 0 ---------------------------------------------------------- 10 SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 11 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,035,208 -------------------------------------------------------------------------------- 12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions) [_] -------------------------------------------------------------------------------- 13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.38% -------------------------------------------------------------------------------- 14 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- Page 5 of 11 Pages ITEM 1. SECURITY AND ISSUER. This statement on Schedule 13D (this "Schedule 13D") relates to the Common Stock, par value $0.50 per share (the "Common Stock"), of Hydril Company (the "Issuer"). The principal executive offices of the Issuer are located at 3300 N. Sam Houston Parkway East, Houston, Texas 77032. Each share of Class B Common Stock, par value $0.50 per share (the "Class B Common Stock"), of the Issuer is convertible at the option of the holder (or upon the occurrence of certain other events) into one Share of Common Stock. This Schedule 13D is being filed with respect to the Common Stock in accordance with Rule 13d-3(d)(i). ITEM 2. IDENTITY AND BACKGROUND. This Schedule 13D is being jointly filed by each of the following persons pursuant to Rule 13d-1(k): Rocca & Partners S. A., San Faustin N.V., I.I.I. Industrial Investments Inc. and Tenaris S.A. ("Tenaris") (collectively, the "Reporting Persons"). The name, place of organization, principal business and business address of each Reporting Person is set forth on Schedule I-A and is incorporated into this Item 2 by reference. The name, present principal occupation or employment (and the name, principal business and address of any corporation or other organization in which such employment is conducted) and citizenship of each director of each Reporting Person is set forth in Schedule I-B and is incorporated into this Item 2 by reference. The name, present principal occupation or employment (and the name, principal business and address of any corporation or other organization in which such employment is conducted) and citizenship of each executive officer of each Reporting Person is set forth in Schedule I-B and is incorporated into this Item 2 by reference. During the last five years, none of the Reporting Persons, nor, to the knowledge of the Reporting Persons, none of the persons listed on Schedule I-B has (i) been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (ii) been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to federal or state securities laws or finding any violation with respect to such laws. Information with respect to each of the Reporting Persons is given solely by such Reporting Person, and no Reporting Person assumes responsibility for the accuracy or completeness of information given by another Reporting Person. ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION. The Voting Agreement described in Item 4 of this Schedule 13D (the terms of which are hereby incorporated by reference) was entered into by Christopher T. Seaver, Patrick T. Seaver, Richard C. Seaver Living Trust and Richard C. Seaver (collectively, the "Stockholders") and Tenaris S.A. The Stockholders entered into the Voting Agreement as an inducement to Tenaris to enter into the Merger Agreement described in Item 4 (the terms of which are hereby Page 6 of 11 Pages incorporated by reference). Tenaris did not pay consideration to the Stockholders in connection with the execution and delivery of the Voting Agreement and thus no funds were used for such purpose. None of the individuals listed on Schedule I-B has contributed any funds or other consideration towards the purchase of securities of the Issuer, nor do the individuals listed on Schedule I-B own any of the Issuer's shares of Common Stock or Class B Common Stock. ITEM 4. PURPOSE OF THE TRANSACTION. (a)-(b) On February 11, 2007, the Issuer, Tenaris and Hokkaido Acquisition, Inc. ("Merger Sub") entered into an Agreement and Plan of Merger, which provides that Merger Sub will be merged with and into the Issuer (the "Merger") and the Issuer will become an indirect wholly owned subsidiary of Tenaris. Pursuant to the Merger, each outstanding share of Common Stock and each outstanding share of Class B Common Stock will be converted into the right to receive $97.00 per share in cash. A copy of the Merger Agreement is included as Exhibit 2.1 hereto and the description of the Merger Agreement herein is qualified in its entirety by reference to Exhibit 2.1, which is incorporated herein by reference. In connection with the execution of the Merger Agreement, in order to induce Tenaris to enter into the Merger Agreement, the Stockholders entered into the Voting Agreement, dated as of February 11, 2007 with Tenaris. Pursuant to the Voting Agreement, each Stockholder agreed, among other things, to vote (or cause to be voted), in person or by proxy, the number of shares of Common Stock and shares of Class B Common Stock listed in the Voting Agreement and any shares such Stockholder purchases or otherwise acquires beneficial ownership of, or acquires the right to vote after the execution of the Voting Agreement (i) in favor of adoption of the Merger Agreement and any other action of the Issuer's stockholders required in furtherance thereof, (ii) against any action or agreement submitted for approval of the stockholders of the Issuer that is reasonably likely to result in a breach of any covenant, representation or warranty or any other obligation or agreement of the Issuer contained in the Merger Agreement or of such Stockholder contained in the Voting Agreement or result in any conditions to Tenaris's obligations under the Merger Agreement not being satisfied; (iii) against any Acquisition Proposal (as defined in the Merger Agreement) or any other action, agreement or transaction submitted for approval to the stockholders of the Issuer that could reasonably be expected to materially impede, interfere or be inconsistent with, delay, postpone, discourage or materially and adversely affect the Merger or the Voting Agreement and (iv) in favor of any other matter required to facilitate the consummation of the transactions contemplated by the Merger Agreement. The Voting Agreement will terminate upon the earlier to occur of (i) the effective time of the Merger (ii) the date and time of termination of the Merger Agreement in accordance with its terms and (iii) the date of any amendment to the Merger Agreement that would reduce the per share merger consideration to be paid pursuant to the Merger Agreement. A copy of the Voting Agreement is included as Exhibit 2.2 hereto and the description of the Voting Agreement contained herein is qualified in its entirety by reference to Exhibit 2.2, which is incorporated herein by reference. Page 7 of 11 Pages (c) No determination has been made with respect to the sale or transfer of a material amount of assets of the Issuer or any of its subsidiaries. (d) It is intended that upon consummation of the Merger, the directors of Merger Sub shall be the directors of the Surviving Corporation (as defined in the Merger Agreement), until their successors have been duly elected or appointed and qualified or until their earlier death, resignation or removal. (e) No determinations have been made regarding material changes in the Issuer's present capitalization or dividend policy. (f) Upon consummation of the Merger, the Issuer will become a wholly owned subsidiary of Tenaris. (g) Pursuant to the Merger Agreement, upon consummation of the Merger, the certificate or incorporation of the Issuer will become the certificate of incorporation of the Surviving Corporation, except that Article Fourth of the certificate of incorporation shall be amended to read in its entirety as follows: "The aggregate number of shares that the Corporation shall have the authority to issue is 1,000 shares of Common Stock, par value $0.50 per share." (h) The Merger Agreement provides that the Surviving Corporation shall, as promptly as practicable after consummation of the merger, cause the shares of Common Stock to no longer be quoted on NASDAQ. (i) Upon consummation of the Merger, the shares of Common Stock will become eligible for termination of registration pursuant to Section 12(g)(4) of the Securities Exchange Act of 1934, as amended. (j) Other than as described above, the Reporting Persons currently have no plans or proposals which relate to, or may result in, any of the matters listed in Items 4(a)-(i) of this Schedule 13D (although the Reporting Persons reserve the right to develop such plans). The description contained in this Item 4 of the transactions contemplated by the Merger Agreement and the Voting Agreement is qualified in its entirety by reference to the full texts of the Merger Agreement and the Voting Agreement, the terms of each of which are incorporated herein by reference to Exhibits 2.1 and 2.2 hereto. Except as set forth in this Schedule 13D, the Merger Agreement and the Voting Agreement, none of the Reporting Persons or, to the best of each the Reporting Person's knowledge, any of the individuals or entities named in Schedule I-B hereto, has any plans or proposals which relate to or which would result in or relate to any of the actions specified in subparagraphs (a) through (j) of Item 4 of Schedule 13D. ITEM 5. INTEREST IN THE SECURITIES OF THE ISSUER. (a)-(b) Pursuant to the Voting Agreement, the Stockholders have agreed to vote 2,956 shares of Common Stock and 1,032,252 shares of Class B Common Stock in the manner described in Item 4. Based on the Issuer's representation in the Merger Agreement that there were 18,218,963 shares of Common Stock outstanding as of February 8, 2007 and assuming 1,032,252 shares of Class B Common stock are converted into the same number of shares of Common Stock, the shares subject to the Voting Agreement represent, on an as-converted basis, approximately 5.38% of the issued Page 8 of 11 Pages and outstanding shares of Common Stock. The Reporting Persons disclaim beneficial ownership of the shares subject to the Voting Agreement, and this Schedule 13D shall not be construed as an admission that any Reporting Person is, for any or all purposes, the beneficial owner of the securities covered by this Schedule 13D. (c) Except as described in this Schedule 13D, there have been no transactions in the shares of Common Stock or Class B Common Stock effected by the Reporting Persons or, to the best of the Reporting Person's knowledge, any person or entity identified on Schedule I-B hereto, during the last 60 days. (d) Not applicable. (e) Not applicable. ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER. The information set forth under Items 3, 4 and 5 and the Merger Agreement and the Voting Agreement set forth on Exhibit 2.1 and Exhibit 2.2, respectively, are incorporated herein by reference. As described in Item 4, Tenaris anticipates it will acquire the entire equity interest in the Issuer pursuant to the Merger Agreement. Other than the Merger Agreement and the Voting Agreement, there are no contracts, arrangements, understandings or relationships (legal or otherwise) among the Reporting Persons or, to the best of the Reporting Person's knowledge, any person listed on Schedule I-B hereto, and any person with respect to the shares of Common Stock or Class B Common Stock. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS. EXHIBIT NUMBER TITLE 1 Merger Agreement, dated as of February 11, 2007, among Hydril Company, Tenaris S.A. and Hokkaido Acquisition, Inc. (incorporated by Reference to Exhibit 2.1 to the Current Report on Form 8-K of Hydril Corporation filed with the Securities and Exchange Commission on February 12, 2007) 2 Voting Agreement, dated as of February 11, 2007, between Tenaris S.A. and Christopher T. Seaver, Patrick T. Seaver, Richard C. Seaver Living Trust and Richard C. Seaver (incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K of Hydril Company filed with the Securities and Exchange Commission on February 15, 2007) 3 Joint Filing Agreement SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. February 21, 2007 ROCCA & PARTNERS S.A. By: /s/ Gianfelice Mario Rocca ------------------------------------ Name: Gianfelice Mario Rocca Title: President SAN FAUSTIN N.V By: /s/ Roberto Bonatti ------------------------------------ Name: Roberto Bonatti Title: President I.I.I. INDUSTRIAL INVESTMENTS INC. By: /s/ Paolo Rocca ------------------------------------ Name: Paolo Rocca Title: President TENARIS S.A. By: /s/ Paolo Rocca ------------------------------------ Name: Paolo Rocca Title: Chairman and Chief Executive Officer SCHEDULE I-A ------------ PLACE OF PRINCIPAL NAME OF REPORTING PERSON ORGANIZATION BUSINESS ADDRESS OF PRINCIPAL OFFICE --------------------------------------------------------------------------------------------------- ROCCA & PARTNERS S.A. British Virgin Holding company Vanterpool Plaza, 2nd Floor, Islands Wickhams Cay I, Road Town, Tortola, British Virgin Islands SAN FAUSTIN N.V. Netherlands Holding company Berg Arrarat I, Curacao, Antilles Netherlands Antilles I.I.I. INDUSTRIAL Cayman Islands Holding company 69 Dr. Roy's Drive, INVESTMENTS INC. Georgetown, Grand Cayman, Cayman Islands TENARIS S.A. Luxembourg Holding company 46 A Ave John F Kennedy of steel tube - 2nd floor L-1855 manufacturing Luxembourg companies SCHEDULE I-B ROCCA & PARTNERS SA DIRECTORS OF ROCCA & PARTNERS SA --------------------------------------------------------------------------------------------------------- RESIDENCE OR BUSINESS PRESENT PRINCIPAL NAME CITIZENSHIP ADDRESS OCCUPATION --------------------------------------------------------------------------------------------------------- Gianfelice Rocca Italian Via Monterosa 93 President of Rocca & Partners, Milan, Italy Chairman of San Faustin Anna Maria Rocca Bonatti Italian Via Maggiolini 1, Milan, Director of Rocca & Partners Italy Marcella Rocca Italian Gaspar Campos 325, 1638 Director of Rocca & Partners Vicente Lopez -Buenos Aires - Argentina Giovanni Sardagna Italian Av. Leandro N. Alem 1067, Director of San Faustin Buenos Aires - Argentina OFFICERS OF ROCCA & PARTNERS SA --------------------------------------------------------------------------------------------------------- RESIDENCE OR BUSINESS PRESENT PRINCIPAL NAME CITIZENSHIP ADDRESS OCCUPATION --------------------------------------------------------------------------------------------------------- Gianfelice Rocca Italian Via Monterosa 93 President of Rocca & Partners, Milan, Italy Chairman of San Faustin Guido Bonatti Italian Via Monterosa 93 Treasurer of Rocca & Partners Milan, Italy Fernando R. Mantilla Argentinean Av. Leandro N. Alem 1067, Secretary of Rocca & Partners Buenos Aires - Argentina Andres Pineyro Argentinean Cerrito 1266, Buenos Assistant Secretary of Rocca & Aires, Argentina Partners Ursula Rosa Geiser Swiss Villa Maggio 2 Assistant Secretary of Rocca & Lugano, Switzerland Partners Cinzia Della Santa Swiss Villa Maggio 2 Assistant Secretary of Rocca & Lugano, Switzerland Partners Umberto Bocchini Swiss Av. Leandro N. Alem 1067, Assistant Secretary of Rocca & Buenos Aires - Argentina Partners SAN FAUSTIN N.V. DIRECTORS OF SAN FAUSTIN N.V. --------------------------------------------------------------------------------------------------------- RESIDENCE OR BUSINESS PRESENT PRINCIPAL NAME CITIZENSHIP ADDRESS OCCUPATION --------------------------------------------------------------------------------------------------------- Gianfelice Rocca Italian Via Monterosa 93 President of Rocca & Partners, Milan, Italy Chairman of San Faustin Giansandro Bassetti Italian Via Monterosa 93 Vice Chairman of San Faustin Milan, Italy Guido Bonatti Italian Via Monterosa 93 Financial Advisor Milan, Italy Marco Drago Italian Via Monterosa 93 Chairman, Milan, Italy De Agostini SpA, Novara Vincenzo Figus Italian Via Monterosa 93 Attorney-at-Law Milan, Italy Gabriele Galateri Italian Via Monterosa 93 President, Mediobanca, Milan Milan, Italy Bruno Marchettini Italian Via Carnaghi 2 Director, Tenaris Milan, Italy Andres Pineyro Argentinean Cerrito 1266, Buenos President, Meridium SA, Buenos Aires, Argentina Aires Ludovico Rocca Italian Av. Leandro N. Alem 1067 Attorney-at-Law Buenos Aires, Argentina Paolo Rocca Italian Av. Leandro N. Alem 1067 Chairman and Chief Executive Buenos Aires, Argentina Officer of Tenaris Giovanni Sardagna Italian Av. Leandro N. Alem 1067 Attorney-at-Law Buenos Aires, Argentina OFFICERS OF SAN FAUSTIN N.V. --------------------------------------------------------------------------------------------------------- RESIDENCE OR BUSINESS PRESENT PRINCIPAL NAME CITIZENSHIP ADDRESS OCCUPATION --------------------------------------------------------------------------------------------------------- Roberto Bonatti Italian Av. Leandro N. Alem 1067 President of San Faustin N.V. Buenos Aires, Argentina Paolo Rocca Italian Av. Leandro N. Alem 1067 Vice President of San Faustin Buenos Aires, Argentina N.V., Chairman and Chief Executive Officer of Tenaris Pierluigi Molajoni American Via Monterosa 93 General Manager of San Faustin Milan, Italy N.V. Carlos Enrique Zandona Argentinean Av. Leandro N. Alem 1067 Treasurer of San Faustin N.V. Buenos Aires, Argentina Fernando R. Mantilla Argentinean Av. Leandro N. Alem 1067 Secretary of San Faustin N.V. Buenos Aires, Argentina Umberto Bocchini Italian Av. Leandro N. Alem 1067 Assistant Secretary of San Buenos Aires, Argentina Faustin N.V. Stefano Gnecchi Ruscone Italian Via Monterosa 93 Assistant Secretary of San Milan, Italy Faustin N.V. I.I.I. INDUSTRIAL INVESTMENT INC. DIRECTORS OF I.I.I. INDUSTRIAL INVESTMENTS INC. --------------------------------------------------------------------------------------------------------- RESIDENCE OR BUSINESS PRESENT PRINCIPAL NAME CITIZENSHIP ADDRESS OCCUPATION --------------------------------------------------------------------------------------------------------- Giansandro Bassetti Italian Av. Leandro Alem 1067, Vice-Chairman of San Faustin Buenos Aires, Argentina Guido Bonatti Italian Via Monterosa 93 Financial Advisor Milan, Italy Roberto Bonatti Italian Av. Leandro N. Alem 1067 President of San Faustin Buenos Aires, Argentina Gianfelice Rocca Italian Via Monterosa 93 Chairman of San Faustin Milan, Italy Paolo Rocca Italian Av. Leandro N. Alem 1067 Chairman and Chief Executive Buenos Aires, Argentina Officer of Tenaris Carlos Manuel Franck Argentinean Av. Leandro N. Alem 1067 President of Santa Maria Buenos Aires, Argentina S.A.I.F. OFFICERS OF I.I.I. INDUSTRIAL INVESTMENTS INC. --------------------------------------------------------------------------------------------------------- RESIDENCE OR BUSINESS PRESENT PRINCIPAL NAME CITIZENSHIP ADDRESS OCCUPATION --------------------------------------------------------------------------------------------------------- Guido Bonatti Italian Via Monterosa 93 Vice-president of I.I.I. Milan, Italy Industrial Investments Inc. Ursula Rosa Geiser Swiss Villa Maggio 2 Treasurer & Assistant Lugano, Switzerland Secretary of I.I.I. Industrial Investments Inc. Fernando R. Mantilla Argentinean Av. Leandro N. Alem 1067 Secretary of I.I.I. Industrial Buenos Aires, Argentina Investments Inc. Umberto Bocchini Italian Av. Leandro N. Alem 1067 Assistant Secretary of I.I.I. Buenos Aires, Argentina Industrial Investments Inc. Caledonian Bank & Trust Ltd Cayman Island Caledonian House - George Assistant Secretary of I.I.I. Town, Grand Cayman, Industrial Investments Inc. Cayman Island TENARIS S.A. DIRECTORS OF TENARIS S.A. --------------------------------------------------------------------------------------------------------- RESIDENCE OR BUSINESS PRESENT PRINCIPAL NAME CITIZENSHIP ADDRESS OCCUPATION --------------------------------------------------------------------------------------------------------- Roberto Bonatti Italian Av. Leandro Alem 1067, President of San Faustin Buenos Aires Argentina Carlos Manuel Franck Argentinean Av. Leandro N. Alem 1067, President of Santa Maria Buenos Aires S.A.I.F. Argentina Bruno Marchettini Argentinean Via Carnaghi 2 Board member of San Faustin, Milan, Italy Ternium and Siderar Robert Monti Argentinean Talcahuano No 826 Non-executive chairman of Piso 6 Trefoil Limited and member of Buenos Aires Argentina the board of Directors of Petrobras Energia, Transocean Offshore Drilling and of John Wood Group PLC Paolo Rocca Italian Av. Leandro N. Alem 1067, Chairman and Chief Executive Buenos Aires - Argentina Officer of Tenaris Gianfelice Rocca Italian Via Monterosa 93 Chairman of San Faustin Milan, Italy Jaime Serra Puche Mexican Prol. Paseo de la Reforma Chairman of SAI Consultores No 600-103 Piso 1 Santa Fe CP 01210. Mexico, D.F. Amadeo Vazquez y Vazquez Argentinean Austria No 2670 Buenos Chairman of the board of Aires - Argentina directors of Telecom Argentina S.A. Guillermo F. Vogel Mexican Campos Eliseos 400 Piso Vice Chairman of Tamsa 17 Col. Chapultepec Polanco. CP 11560. Mexico, D.F. OFFICERS OF TENARIS S.A. --------------------------------------------------------------------------------------------------------- RESIDENCE OR BUSINESS PRESENT PRINCIPAL NAME CITIZENSHIP ADDRESS OCCUPATION --------------------------------------------------------------------------------------------------------- Paolo Rocca Italian Av. Leandro N. Alem 1067, Chairman and Chief Executive Buenos Aires - Argentina Officer of Tenaris Alberto Valsecchi Italian Av. Leandro N. Alem 1067, Chief Operating Officer of Buenos Aires - Argentina Tenaris Carlos Condorelli Argentinean Av. Leandro N. Alem 1067, Chief Financial Officer of Buenos Aires - Argentina Tenaris Alejandro Lammertyn Argentinean Av. Leandro N. Alem 1067, Supply Chain Director of Buenos Aires - Argentina Tenaris OFFICERS OF TENARIS S.A. (CON'T) --------------------------------------------------------------------------------------------------------- RESIDENCE OR BUSINESS PRESENT PRINCIPAL NAME CITIZENSHIP ADDRESS OCCUPATION --------------------------------------------------------------------------------------------------------- Marco Radnic Argentinean Av. Leandro N. Alem 1067, Human Resources Director of Buenos Aires - Argentina Tenaris Marcelo Ramos Argentinean Dr. Jorge A. Simini 250, Quality Director of Tenaris Campana Buenos Aires -Argentina German Cura Argentinean Av. Leandro N. Alem 1067, Commercial Director of Tenaris Buenos Aires - Argentina German Cura Argentinean 2200 West Loop South, North American Area Manager of 8th floor Tenaris Houston, TX -USA Sergio de la Maza Mexican Km. 433.7 Carr. Central American Area Manager Mexico-Veracruz Via of Tenaris Xalapa, Veracruz-Mexico Guillermo Noriega Argentinean Dr. Jorge A. Simini 250, South American Area Manager of Campana Tenaris Buenos Aires -Argentina Vincenzo Crapanzano Italian Piazza Caduti 6 Luglio European Area Manager of 1944, 1 Tenaris Bergamo-Italy Claudio Leali Italian 1-10 Minamiwatarida, Managing Director, Japanese Kawasaki-ku, Kanagawa, Operations of Tenaris Kawasaki-Japan Tulio Chipoletti Brazilian Av. Dr. Gastao Vidigal Area Manager, Brazil, of Neto, 475 Cidade Nova Tenaris Pindamonhangaba Sao Paulo-Brazil Emyr Berbare Brazilian Av. Dr. Gastao Vidigal Director, Confab Equipamentos Neto, 475 Cidade Nova of Tenaris Pindamonhangaba Sao Paulo-Brazil Sergio Tosato Italian Piazza Caduti 6 Luglio Industrial Coordination 1944, 1 Director of Tenaris Bergamo-Italy Giancarlo Miglio Italian Av. Leandro N. Alem 1067, Information Technology Buenos Aires - Argentina Director of Tenaris Carlos Pappier Argentinean Av. Leandro N. Alem 1067, Planning Director of Tenaris Buenos Aires - Argentina Carlos San Martin Argentinean Dr. Jorge A. Simini 250, Technology Director of Tenaris Campana Buenos Aires -Argentina