Board of Directors

Mr. Bonatti is a member of our board of directors. He is a grandson of Agostino Rocca, founder of the Techint group, a group of companies controlled by San Faustin N.V. (San Faustin). Throughout his career in the Techint group he has been involved specifically in the engineering and construction and corporate sectors. He was first employed by the Techint group in 1976, as deputy resident engineer in Venezuela. In 1984, he became a director of San Faustin, and since 2001 he has served as its president. In addition, Mr. Bonatti currently serves as president of Tecpetrol S.A. (Tecpetrol) and Techint Compañia Técnica Internacional S.A.C.I. He is also a member of the board of directors of Ternium S.A. (Ternium), Siderca S.A.I.C. (Siderca) and Siderar S.A.I.C. (Siderar). Mr. Bonatti is an Italian citizen.

Mr. Condorelli is a member of our board of directors. He served as our chief financial officer from October 2002 until September 2007. He is also a board member of Ternium. He began his career within the Techint group in 1975 as an analyst in the accounting and administration department of Siderar. He has held several positions within Tenaris and other Techint group companies, including finance and administration director of Tubos de Acero de México, S.A. (Tamsa) and president of the board of directors of Empresa Distribuidora La Plata S.A., or Edelap, an Argentine utilities company. Mr. Condorelli is an Argentine citizen.

Mr. Franck is a member of our board of directors. He is president of Santa María S.A.I.F. and Inverban S.A., vice president of Siderca and a member of the board of directors of Techint Financial Corporation N.V., III Industrial Investments Inc., Siderar, Tecpetrol and Tecgas N.V. He has financial, planning and control responsibilities in subsidiaries of San Faustin. Mr. Franck is an Argentine citizen.

Mr. Monti is a member of our board of directors. He is the non-executive chairman of Trefoil Limited and a member of the board of directors of Petrobras Energia and of John Wood Group PLC. He has served as vice president of Exploration and Production of Repsol YPF and chairman and CEO of YPF. He was also president of Dowell, a subsidiary of Schlumberger and president of Schlumberger Wire & Testing division for East Hemisphere Latin America. Mr. Monti is an Argentine citizen.

* Member of the Audit Commitee

Mr. Rocca is a member of our board of directors. He is a grandson of Agostino Rocca. He is chairman of the board of directors of San Faustin, a member of the board of directors of Tamsa and Ternium, president of the Humanitas Group and president of the board of directors of Techint Compagnia Tecnica Internazionale S.p.A. and Tenova S.p.A. In addition, he sits on the board of directors or executive committees of several companies, including Allianz S.p.A, RCS Quotidiani, and Buzzi Unicem. He is vice president of Confindustria, the leading association of Italian industrialists. He is a member of the Advisory Board of Allianz Group, the Trilateral Commission and the European Advisory Board of the Harvard Business School. Mr. Rocca is an Italian citizen.

Mr. Rocca is chairman of the Company's board of directors and our chief executive officer. He is a grandson of Agostino Rocca. He is also chairman of the board of directors of Tamsa. He is also chairman of the board of directors of Ternium, director and vice president of San Faustin and director of Techint Financial Corporation N.V. Mr. Rocca is a vice chairman of the World Steel Association and member of the International Advisory Committee of the NYSE Euronext (New York Stock Exchange). Mr. Rocca is an Italian citizen.

Mr. Serra Puche is a member of our board of directors. He is chairman of SAI Consultores, a Mexican consulting firm, and a member of the board of directors of Chiquita Brands International, the Mexico Fund, Grupo Vitro and Grupo Modelo. Mr. Serra Puche served as Mexico's Undersecretary of Revenue, Secretary of Trade and Industry, and Secretary of Finance. He led the negotiation and implementation of NAFTA. Mr. Serra Puche is a Mexican citizen.

* Member of the Audit Commitee

Mr. Valsecchi is a member of our board of directors. He served as our chief operating officer from Februrary 2004 until July 2007. He joined the Techint group in 1968 and has held various positions within Tenaris and other Techint group. He has retired from his executive positions. He is also a member of the board of directors of San Faustin and has been elected as the chairman of the board of directors of Dalmine, a position he assumed in May 2008. Mr. Valsecchi is an Italian citizen.

Mr. Vázquez y Vázquez is a member of our board of directors. He is an independent member of the board of directors of Gas Natural Ban S.A. He is a member of the executive committee of the Asociación Empresaria Argentina, and of the Fundación Mediterránea, and he is a member of the Advisory Board of the Fundación de Investigaciones Económicas Latinoamericanas. He served as CEO of the Banco Río de la Plata S.A. until August 1997 and was also the chairman of the board of directors of Telecom Argentina S.A. until April 2007. Mr. Vázquez y Vázquez is an Spanish and Argentine citizen.

* Member of the Audit Commitee

Mr. Vogel is a member of our board of directors. He is vice chairman of Tamsa, chairman of Grupo Collado S.A.B. de C.V, vice chairman of Estilo y Vanidad S.A. de C.V. and member of the board of directors of Alfa S.A.B. de C.V., the American Iron and Steel Institute, the North American Steel Council and the North American Competitiveness Council. In addition, he is a member of the board of directors and of the investment committee of the Corporación Mexicana de Inversiones de Capital and a member of the board of directors and the audit committee of HSBC (México). Mr. Vogel is a Mexican citizen.