FORM 6-K

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                        Report of Foreign Private Issuer
                    Pursuant to Rule 13a - 16 or 15d - 16 of
                       the Securities Exchange Act of 1934

                              As of March 31, 2003

                                  TENARIS, S.A.
                 (Translation of Registrant's name into English)

                                  TENARIS, S.A.
                               23 Avenue Monterey
                                 2086 Luxembourg
                    (Address of principal executive offices)

     Indicate by check mark whether the registrant files or will file annual
                     reports under cover Form 20-F or 40-F.

                           Form 20-F |X| Form 40-F |_|

      Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the information to
the Commission pursuant to Rule 12G3-2(b) under the Securities Exchange Act of
1934.

                                 Yes |_| No |X|

      If "Yes" is marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b): 82-____.




The attached material is being furnished to the Securities and Exchange
Commission pursuant to Rule 13a-16 and Form 6-K under the Securities Exchange
Act of 1934, as amended. This report contains Tenaris's press release announcing
its plan for the acquisition of remaining minority interests in Tubos de Acero
de Mexico.

                                    SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.

Date: March 31, 2003

                                  Tenaris, S.A.

By: /s/ Cecilia Bilesio
    --------------------------
    Cecilia Bilesio
    Corporate Secretary

                                                                    Exhibit 99.1

[LOGO] Tenaris                                                     Press Release

Gerardo Varela
Tenaris
1-888 300 5432
www.tenaris.com

Tenaris Announces Plan for the Acquisition of Remaining Minority Interests in
Tamsa

LUXEMBOURG (March 31, 2003). Tenaris S.A. (NYSE, BASE and Mexico: TS; MTA Italy:
TEN), announced today that it plans to acquire any remaining minority interests
in Tubos de Acero de Mexico S.A. - Tamsa (AMEX: TAM and Mexico: TAMSA). In
addition, Tenaris announced that it intends to cause the delisting of Tamsa from
the Mexican Stock Exchange and the American Stock Exchange, the termination of
Tamsa's ADR facility and, if and when appropriate, the termination of Tamsa's
registration with the U.S. Securities and Exchange Commission (the SEC). Tenaris
currently holds, directly or indirectly, 94.5% of the shares and ADSs of Tamsa.

Subject to the approvals of the U.S. and Mexican securities regulators and
Tamsa's extraordinary shareholders meeting, Tenaris intends to effect an
exchange of its shares and ADSs for any Tamsa shares and ADSs not held by
Tenaris or its affiliates in accordance with Mexican and U.S. laws. Tenaris
currently does not expect to obtain the requisite approvals, and consequently be
in a position to effect any exchange of shares and ADSs, prior to June 2003.
Further details about the terms and conditions of the proposed transaction will
be provided as soon as practicable after obtaining the requisite approvals.

Tenaris will not effect any exchange of its shares and ADSs for the Tamsa shares
and ADSs unless it obtains all relevant shareholder and Mexican and U.S.
regulatory approvals. No assurance can be given that the relevant securities
regulators or Tamsa's shareholders' meeting will grant the requisite approvals
within the expected timeframes.

TENARIS URGES INVESTORS TO READ, BEFORE MAKING ANY DECISION, THE REGISTRATION
STATEMENTS, PROSPECTUSES AND ANY OTHER RELEVANT DOCUMENTS THAT WILL BE FILED
WITH THE SECURITIES REGULATORS ONCE THEY BECOME AVAILABLE, BECAUSE THEY WILL
CONTAIN IMPORTANT INFORMATION.

Investors will be able to obtain the documents filed with the SEC, when they
become available, at the SEC's website at www.sec.gov.

This communication does not constitute an offer or solicitation for the sale,
purchase or acquisition of securities of Tenaris or Tamsa in any jurisdiction.

Tenaris is a leading global manufacturer of seamless steel pipe products and
provider of pipe handling, stocking and distribution services to the oil and
gas, energy and mechanical industries and a leading regional supplier of welded
steel pipes for gas pipelines in South America. Organized in Luxembourg, it has
pipe manufacturing facilities in Argentina, Brazil, Canada, Italy, Japan, Mexico
and Venezuela and a network of customer service centers present in over 20
countries worldwide.