|Exhibit 99.1.
|-------------



|FOR IMMEDIATE RELEASE
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|Gerardo Varela / Jose Ramon Calderon 
      Tamsa 
      011-52-55-5282-9913 
      www.tamsa.com.mx |  | Cesar Villavicencio 
      Citigate Financial Intelligence 
      (212) 688-6840 / (212) 419-8305
|---------------------------------------------------------------------------------------------------- |  | -------------------------------------------------------------------------------------------------



|MEXICO CITY (December 11, 2002) - Tubos de
Acero de Mexico, S.A. (AMEX: TAM) (Tamsa) announced today the plans of its Directors
who hold shares or ADSs of Tamsa in connection with the Tenaris Exchange Offer.
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|Pursuant to the rules and regulations of the
Mexican Banking and Securities Commission, Tamsa informs investors that its Directors who
hold shares or ADSs of Tamsa plan to take the following actions in connection with the
offer by Tenaris S.A. (Tenaris), a Luxembourg company, to exchange shares and ADSs of
Tenaris for shares and ADSs of Tamsa, commenced on November 11, 2002 (the Exchange
Offer):
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|                            | 
|--------------------------- | 
|Director                    | 
|                            | 
|Carlos Abedrop Davila       | 
|Adalberto Cortesi Queirazza | 
|Raul Gerardo Varela Juarez  | 
|Guillermo F. Vogel Hinojosa | 



|This communication is neither an offer to
purchase nor a solicitation of an offer to sell shares or ADSs. The Exchange Offer is
made in the United States solely by the prospectus dated November 8, 2002, and the
related forms of acceptance and ADS letters of transmittal and is not being made to, nor
will tenders be accepted from or on behalf of, holders of shares or ADSs in any
jurisdiction in which the making of the exchange offer or acceptance thereof would not be
in compliance with the laws of such jurisdiction. In those jurisdictions where the
applicable laws require that the Exchange Offer be made by a licensed broker or dealer,
the Exchange Offer shall be deemed to be made on behalf of the dealer manager for the
Exchange Offer or one or more registered brokers or dealers licensed under laws of such
jurisdiction.
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