Arcelormittal

Christine Kaczynski

Emmanuel Dechassey

Marie-Christine Theyssier

Quang-Tien Ngo

Vicente Polo Mestre

Christophe Silvy-Leligois

Francisco Chicharro Herranz

Thierry Celotto

Thomas Dupuy

Astrid Perlade

Remi Cavallotti

Céline Musik

Yacine Benlatreche

Thomas Dupuis

Celine Musik

Christophe Silvy Leligois

A pre-coated steel substrate coated with: a first pre-coating including titanium, the first coating having a thickness of 40 nm to 1200 nm, optionally, an intermediate pre-coating layer including at least 8% by weight nickel and at least 10% by weight chromium, the rest being iron or an intermediate pre-coating layer including Fe, Ni, Cr and Ti wherein the amount of Ti is above or equal to 5 wt. % and wherein the following equation is satisfied: 8 wt. %<Cr+Ti<40 wt. %, the balance being Fe and Ni, the intermediate pre-coating layer having a thickness between 2 and 30 nm a second pre-coating being a zinc-based coating and the steel substrate including above 0.05 wt. % of Si.

Method for manufacturing an assembly

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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Maizières-les-Metz, France

Christine Kaczynski