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 April 7, 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 announcing advance
purchase of natural gas in Argentina

                                    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: April 7, 2003

                                  Tenaris, S.A.

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