1909 Dalmine begins manufacturing seamless steel tubes in Italy.
1914 Nippon Kokan Kabushiki-gaisha (NKK) begins manufacturing seamless
steel tubes in Japan.
1924 Dalmine is listed on the Milan Stock Exchange.
1935 Agostino Rocca, the future founder of the Techint Group of Companies,
becomes Managing Director at Dalmine.
1953 Tamsa is listed on the Mexican Stock Exchange.
1954 Tamsa begins operations in Mexico and Siderca in Argentina.
Both plants are constructed by Techint.
1958 Siderca is listed on the Buenos Aires Stock Exchange.
1960 Confab, a Brazilian manufacturer of industrial equipment, begins to produce
welded steel tubes.
1967 Tamsa is listed on the American Stock Exchange, becoming the first Mexican
company to be listed on a U.S. Stock Exchange through an American
Depositary Receipts (ADR) program.
1980 Algoma orders North America's first retained mandrel seamless tube mill.
1986 Siderca takes over Siat, an Argentine welded pipe manufacturer established
1993 Siderca acquires a controlling interest in Tamsa and forms a strategic alliance.
1996 Siderca acquires a controlling interest in Dalmine following its privatization.
With Tamsa, this strategic alliance becomes DST.
1998 Siderca acquires TAVSA.
1999 Siderca acquires control of Confab.
2000 Siderca and NKK Corporation form NKKTubes to take over NKK's seamless
tube manufacturing business at Keihin Works (Tokyo, Japan).
Siderca leases Algoma Steel's seamless steel tube plant and begins operating
2001 The Tenaris brand name is introduced, replacing DST.
Siderca is listed on the New York Stock Exchange (NYSE).
2002 Tenaris S.A., a company incorporated 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.
2004 Tenaris acquires control of Silcotub, a Romanian manufacturer of seamless
2006 Tenaris establishes a strong presence in the U.S. through the acquisition of
Maverick Tube Corp. At the same time, its presence in Canada is expanded
with Prudential and it establishes a presence in Colombia through TuboCaribe.
2007 With Hydril, Tenaris expands its offer of products and services for the
oil and gas industry.
2009 Tenaris extends its presence in the Far East through the integration of SPIJ,
an Indonesian OCTG processing operation.
Venezuela nationalizes TAVSA.
2010 Inauguration of new threading facility in Saudi Arabia.
2011 Tenaris opens its new rolling mill at the Tenaris Industrial Center in Veracruz.