Arcelormittal

Thomas Dupuy

Emmanuel Dechassey

Marie-Christine Theyssier

Christine Kaczynski

Francisco Chicharro Herranz

Vicente Polo Mestre

Quang-Tien Ngo

Christophe Silvy-Leligois

Thierry Celotto

Christophe Silvy Leligois

A steel sheet that is welded and then cold rolled to a thickness between 0.5 mm and 3 mm, the deformation ratio created by cold rolling in the base metal is equal to ε, for which the deformation ratio created by the cold rolling in the welded joint is equal to ε, where:

Welded steel sheets, and sheets thus produced

A method for the manufacture of a cold-rolled steel sheet of thickness ebetween 0.5 mm and 3 mm is provided. At least two hot-rolled sheets of thickness eare supplied and butt welded, so as to create a welded joint (S1) with a direction perpendicular to the direction of hot rolling. The at least two hot-rolled sheets are pickled by continuous passage through a bath, then the assembly is cold rolled, in a step (L1), to an intermediate thickness e, the direction of cold rolling (DL) coinciding with the direction of hot rolling. The cold rolling is carried out with a reduction ratio such that: then the welded joint (S1) is removed so as to obtain at least two intermediate cold-rolled sheets. Then the two intermediate cold-rolled sheets are butt welded, so as to create a welded joint (S2), the direction of which is perpendicular to the direction of hot rolling, then the assembly of the at least two intermediate cold-rolled and welded sheets is cold-rolled, in a step (L2), to the final thickness e, the direction (DL) of the cold rolling step (L2) coinciding with the direction of rolling (DL).

Method for manufacturing cold-rolled, welded steel sheets, and sheets thus produced

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Le Ban-Saint-Martin, France

Thomas Dupuy