| 1909 |
Dalmine begins manufacturing seamless steel tubes in Italy. |
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| 1914 |
Nippon Kokan Kabushiki-gaisha (NKK) begins manufacturing seamless steel tubes in Japan. |
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| 1924 |
Dalmine is listed on the Milan Stock Exchange. |
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| 1935 |
Agostino Rocca, the future founder of the Techint Group of Companies, becomes Managing Director at Dalmine. |
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| 1953 |
Tamsa is listed on the Mexican Stock Exchange. |
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| 1954 |
Tamsa begins operations in Mexico and Siderca in Argentina. Both plants are constructed by Techint. |
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| 1958 |
Siderca is listed on the Buenos Aires Stock Exchange. |
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| 1960 |
Confab, a Brazilian manufacturer of industrial equipment, begins to produce welded steel tubes. |
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| 1967 |
Tamsa lists on the American Stock Exchange becoming the first Mexican company to list on a U.S. Stock Exchange through an American Depositary Receipts (ADR) program. |
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| 1980 |
Algoma orders North America's first retained mandrel seamless tube mill.
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| 1986 |
Siderca takes over Siat, an Argentine welded pipe manufacturer established in 1948. |
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| 1993 |
Siderca acquires a controlling interest in Tamsa and forms a strategic alliance. |
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| 1996 |
Siderca acquires a controlling interest in Dalmine following its privatisation. With Tamsa, this strategic alliance becomes DST. |
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| 1998 |
Tamsa establishes Tavsa with Corporación Venezolana de Guayana to take over Sidor's seamless steel tube mill. |
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| 1999 |
Siderca acquires control of Confab. |
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| 2000 |
Siderca and NKK Corporation form NKKTubes to take over NKK's seamless tube manufacturing business at Keihin Works (Tokyo, Japan). |
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Siderca leases Algoma Steel's seamless steel tube plant and begins operating AlgomaTubes. |
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| 2001 |
The Tenaris brand name is introduced replacing DST. |
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Siderca lists on the New York Stock Exchange (NYSE). |
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| 2002 |
Tenaris S.A., a company organized in Luxembourg, becomes the group holding company following an exchange offer for the shares of Siderca, Tamsa and Dalmine and is simultaneously listed on the New York, Milan, Buenos Aires, and Mexican stock exchanges.
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| 2004 |
Tenaris acquires control of Silcotub, a Romanian manufacturer of seamless steel pipes. |
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| 2006 |
Tenaris establishes a strong presence in USA through the acquisition of Maverick Tube Corp. At the same time, its presence in Canada is expanded with Prudential and establishes a presence in Colombia through TuboCaribe. |
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| 2007 |
With Hydril, Tenaris expands its offer of products and services for the oil & gas industry. |
