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 November 23, 2005

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

                                  TENARIS, S.A.
                           46a, Avenue John F. Kennedy
                                L-1855 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 it makes binding offer
to acquire additional welded pipe assets 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: November 23, 2005


                                  Tenaris, S.A.


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





            Tenaris Makes Binding Offer to Acquire Additional Welded
                            Pipe Assets in Argentina

     LUXEMBOURG--(BUSINESS   WIRE)--Nov.   22,   2005--Tenaris   S.A.  (NYSE:TS)
(BCBA:TS)  (BMV:TS) (BI:TEN)  announced today that, through its Argentine welded
pipe  subsidiary,  Siat S.A,  it has made a binding  offer to acquire the welded
pipe  assets  and  facilities  of Acindar  Industria  Argentina  de Aceros  S.A.
(Acindar)  located  in Villa  Constitucion,  Santa Fe, for  approximately  US$28
million. The proposed acquisition has been approved by the Argentine competition
authorities  but  remains  subject to Acindar  being  released  from its general
restriction  on  asset   dispositions   under  its  ongoing   out-of-court  debt
restructuring and the satisfaction of applicable publicity requirements relating
to bulk transfers of assets.
     The facilities that would be acquired with this  transaction have an annual
capacity of 80,000 tons of welded  pipes whose small  diameter  size range would
complement the range of welded pipes that it currently produces in 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,  Romania and Venezuela and a network of customer service centers present
in over 20 countries worldwide.


    CONTACT: Tenaris
             Nigel Worsnop, 1-888-300-5432
             www.tenaris.com