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 28, 2004



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


                                  TENARIS, S.A.
                                13, rue Beaumont
                                L-1219 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
that Tenaris and Sidor sign agreement to purchase Venezuelan HBI plant

Tenaris and Sidor Sign Agreement to Purchase Venezuelan HBI Plant

    LUXEMBOURG--(BUSINESS WIRE)--April 27, 2004--Tenaris S.A.
(NYSE:TS) (Buenos Aires:TS) (BMV:TS) (MTA Italy:TEN) announced today
that, together with Sidor, a Venezuelan steel producer in which it has
an indirect investment, it has signed an agreement with Posven, a
Venezuelan company in which Posco of Korea has a 60% shareholding, for
the sale and purchase of its assets -- principally an industrial
facility for the production of pre-reduced hot briquetted iron, or
HBI, located in Ciudad Guayana, Venezuela -- for a price of US$120
million. The acquisition, that will be effected by a newly-formed
company, of which Tenaris will hold 55% and Sidor 45%, remains subject
to a number of closing conditions including the transfer of operating
contracts on satisfactory terms. The facility, which has a nominal
annual design capacity of 1.5 million tons of HBI and was constructed
by Raytheon Engineers & Constructors using technology developed by
Hylsamex, a Mexican steel producer, has been shut down since 2001
shortly after commencing operations.
    This investment, which complements a previous investment in the
Comsigua HBI plant also located in Ciudad Guayana, Venezuela, will
allow Tenaris to secure a further low-cost source of high quality
ferrous raw material. Tenaris also operates a pre-reduced iron, or
DRI, facility in Campana, Argentina.
    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. Domiciled 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.

    CONTACT: Tenaris
             Nigel Worsnop, 888-300-5432
             www.tenaris.com





                                    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 28, 2004



                                  Tenaris, S.A.




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