Usinor (formerly known as Usinor Sacilor), a société anonyme organized under the laws of the French
Republic (“Usinor”), wholly owned by Arcelor, a société anonyme incorporated under the laws of
Luxembourg (“Arcelor”) offers to purchase for cash any and all of its $300 million aggregate principal amount
of 7¼% Bonds due August 1, 2006.

The purpose of the offer is to reduce Arcelor’s gross indebtedness and borrowing costs and optimize the use of its cash. Arcelor intends to fund the offer through cash generated from its operations.
Usinor will conduct the offer in accordance with terms and conditions described in its Offer to Purchase, dated 24 June 2005.

About the Arcelor Group
The Arcelor Group (the “Group”) was created in February 2002. Arcelor was born out of the amalgamation of three steelmakers, Aceralia, Arbed and Usinor, to create a leading steel company in the global steel industry.
The Group is developing its business in four principal sectors: Flat Carbon Steels, Long Carbon Steels, Stainless Steels and Arcelor Steel Solutions and Services (“A3S”). Employing almost 95,000 people in more than 60 countries, Arcelor is a major player in the global steelmaking industry, with output of 47 million tons of steel and sales of 30 billion euros in 2004. Thirty percent of output is produced from scrap through the electric arc furnace, 70% being produced from iron ore. On a proforma basis for 2004, including the Group’s
new Brazilian and Argentine businesses, sales amount to 31.26 billion euros with output of 51 million tons of steel. The Group is a leading player in all its principal markets: automotive, construction, domestic electrical
appliances, packaging and general industry.