Feb. 10, 2006 — Arcelor SA is extending the expiry date of its offer to acquire all of the outstanding Common Shares of Dofasco Inc. to February 20, 2006 in order to allow for sufficient time to obtain the required regulatory approvals. February 9, 2006 was the original expiry date.

Arcelor's extended offer is included in its formal notice of extension, which is now being mailed to Dofasco's shareholders. The notice will also be available on the SEDAR website.

UBS and Merrill Lynch are acting as financial advisers and Ogilvy Renault LLP is acting as legal advisor to Arcelor.

Established in 1912, Dofasco is a leading North American steel solutions provider. Product lines include hot rolled, cold rolled, galvanized, Extragal^(TM), Galvalume^(TM), and tinplate flat rolled steels, as well as tubular products, laser-welded blanks and Zyplex^(TM), a proprietary laminate. Dofasco's wide range of steel products is sold to customers in the automotive, construction, energy, manufacturing, pipe and tube, appliance, packaging and steel distribution industries. The company has additional operations in Canada, the United States and Mexico. Dofasco also owns 98.7% of Quebec Cartier Mining (QCM). QCM owns and operates the Mont-Wright open pit mine and a pellet plant at Port-Cartier.

Arcelor holds leadership positions in its main markets: automotive, construction, household appliances and packaging as well as general industry. The company — number one steel producer in Europe and Latin America — intends to further expand internationally in order to capture the growth potential of developing economies and offer technologically advanced steel solutions to its customers. Arcelor employs 94,000 associates in over 60 countries. The company places its commitment to sustainable development at the heart of its strategy and ambitions to be a benchmark for economic performance, labor relations and social responsibility.