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.