Arcelormittal

Pascal Bertho

Christian Allely

Hassan Ghassemi-Armaki

Anirban Chakraborty

Tiago Machado Amorim

Stéphanie Michaut

Jean-Marie Helmer

Maxime Brossard

An assembly of at least two metallic substrates spot welded together through at least one spot welded joint is provided, a method for the manufacture of the assembly is also provided, such method including two steps and the use of this assembly for the manufacture of automotive vehicle.

Assembly of at least 2 metallic substrates

The present invention relates to a method for the manufacture of a coated steel sheet comprising the following successive steps: A. the coating of the steel sheet with a first coating consisting of nickel and having a thickness between 600 nm and 1400 nm, the steel sheet having the following composition in weight: 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0%, and on a purely optional basis, one or more elements such as Nb≤0.5%, B≤0.010%, Cr≤1.0%, Mo≤0.50%, Ni≤1.0%, Ti≤0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, B. the recrystallization annealing at a temperature between 820 to 1200° C., C. the coating with a second coating based on zinc not comprising nickel.

Method for the manufacturing of liquid metal embrittlement resistant zinc coated steel sheet

The present invention relates to a method for the manufacture of a galvannealed steel sheet including the steps of A.) coating of the steel sheet with a first coating consisting of nickel and having a thickness between 150 nm and 650 nm, the steel sheet having the following composition in weight percentage 0.10<C<0.40%, 1.5<Mn<3.0%, 0.7<Si<3.0%, 0.05<Al<1.0%, 0.75<(Si+Al)<3.0%, and on a purely optional basis, one or more elements such as Nb≤0.5%, B≤0.010%, Cr≤1.0%, Mo≤0.50%, Ni≤1.0%, Ti≤0.5%., the remainder of the composition is made up of iron and inevitable impurities resulting from the elaboration, B.) annealing of the coated steel sheet being annealed at a temperature between 600 to 1200° C., C.) coating of the steel sheet obtained in step B.) with a second coating based on zinc and D.) an alloying heat treatment to form a galvannealed steel sheet.

Method for the manufacturing of liquid metal embrittlement resistant galvannealed steel sheet

A method for the manufacture of an assembly of at least two metallic substrates spot welded together through at least one spot welded joint, such method including two steps, the assembly obtainable according to this method and the use of this assembly for the manufacture of automotive vehicle.

A steel sheet coated with a coating comprising from 10 to 40% of nickel, the balance being zinc, such steel sheet having a microstructure comprising from 1 to 50% of residual austenite, from 1 to 60% of martensite and optionally at least one element chosen from: bainite, ferrite, cementite and pearlite, and the following chemical composition in weight: 0.10&#x3c;C&#x3c;0.50%, 1.0&#x3c;Mn&#x3c;5.0%, 0.7&#x3c;Si&#x3c;3.0%, 0.05&#x3c;Al&#x3c;1.0%, 0.75&#x3c;(Si+Al)&#x3c;3.0% and on a purely optional basis, one or more elements such as Nb&#x2264;0.5%, B&#x2264;0.005%, Cr&#x2264;1.0%, Mo&#x2264;0.50%, Ni&#x2264;1.0%, Ti&#x2264;0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration.

Method for the manufacture of a coated steel sheet

The present invention relates to a method for the manufacture of a galvannealed steel sheet including the steps of A.) coating of the steel sheet with a first coating consisting of nickel and having a thickness between 150 nm and 650 nm, the steel sheet having the following composition in weight percentage 0.10&#x3c;C&#x3c;0.40%, 1.5&#x3c;Mn&#x3c;3.0%, 0.7&#x3c;Si&#x3c;3.0%, 0.05&#x3c;Al&#x3c;1.0%, 0.75&#x3c;(Si+Al)&#x3c;3.0%, and on a purely optional basis, one or more elements such as Nb&#x2264;0.5%, B&#x2264;0.010%, Cr&#x2264;1.0%, Mo&#x2264;0.50%, Ni&#x2264;1.0%, Ti&#x2264;0.5%, the remainder of the composition is made up of iron and inevitable impurities resulting from the elaboration, B.) annealing of the coated steel sheet being annealed at a temperature between 600 to 1200&#xb0; C., C.) coating of the steel sheet obtained in step B.) with a second coating based on zinc and D.) an alloying heat treatment to form a galvannealed steel sheet.

The present invention relates to a method for the manufacture of a coated steel sheet comprising the following successive steps: A. the coating of the steel sheet with a first coating consisting of nickel and having a thickness between 600 nm and 1400 nm, the steel sheet having the following composition in weight: 0.10&#x3c;C&#x3c;0.40%, 1.5&#x3c;Mn&#x3c;3.0%, 0.7&#x3c;Si&#x3c;3.0%, 0.05&#x3c;Al&#x3c;1.0%, 0.75&#x3c;(Si+Al)&#x3c;3.0%, and on a purely optional basis, one or more elements such as Nb&#x2264;0.5%, B&#x2264;0.010%, Cr&#x2264;1.0%, Mo&#x2264;0.50%, Ni&#x2264;1.0%, Ti&#x2264;0.5%, the remainder of the composition making up of iron and inevitable impurities resulting from the elaboration, B. the recrystallization annealing at a temperature between 820 to 1200&#xb0; C., C. the coating with a second coating based on zinc not comprising nickel.

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Maizieres-les-Metz, France

Pascal Bertho