Usinor is a French steel group initially based in northern France, founded in 1948 by the Société des Forges et Aciéries du Nord et de l'Est and the Société de Denain-Anzin. It merged in 1973 with its Lorraine competitor Sacilor and took the name Usinor-Sacilor.

In 1997, Usinor-Sacilor became Usinor again In 2002, Usinor merged with the Spanish Aceralia and the Luxembourgish Arbed to form the European group Arcelor.

This group disappeared in 2006, when Mittal Steel Company launched a takeover bid for Arcelor which resulted in a merger of the two groups in June 2006 to form ArcelorMittal.

Illustrated.

Head office 14 rue d'Athènes, Paris

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