Arcelormittal

Arcelormittal Investigacion Y Desarrollo, S.l.

Jonas Staudte

Pascal Drillet

Jean-Michel Mataigne

Juan David Puerta Velasquez

Michel Bordignon

Astrid Perlade

Kangying Zhu

John A Rotole

Hubert Saint-Raymond

Michel Roger Louis Bordignon

Pauline Briault

Franco Del Frate

Ian Alberto Zuazo-Rodriguez

Thierry Hourman

A hot-dip coated steel substrate coated with a layer of Sn directly topped by a zinc or an aluminum based coating is provided, the steel substrate having the following chemical composition in weight percent:

Hot-dip coated steel substrate

A hot-dip coated steel substrate coated with a layer of Sn directly topped by a zinc or an aluminum based coating is provided, the steel substrate having the following chemical composition in weight percent:0.10&#x2264;C&#x2264;0.4%,1.2&#x2264;Mn&#x2264;6.0%,0.3&#x2264;Si&#x2264;2.5%,Al&#x2264;2.0%,and on a purely optional basis, one or more elements such asP&#x3c;0.1%,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, the steel substrate further having between 0.0001 and 0.01% by weight of Sn in the region extending from the steel substrate surface up to 10 &#x3bc;m.

A method for producing a metallic coated steel sheet is provided. The method includes continuously annealing a steel sheet in a continuous annealing furnace and hot dip coating the steel sheet.

Method for producing a metallic coated steel sheet

A method of annealing of steel sheets is provided which includes a first step consisting in fully oxidizing the surface of such steel sheet thus creating a fully oxided surface layer, a second step consisting in selectively oxidizing elements other than iron of such steel, in an area extending under said fully oxided layer, thus creating a selectively oxided internal layer and a third step consisting in fully reducing said fully oxided surface layer.

Method of annealing steel sheets

A cold rolled and hot dip coated steel sheet presenting a tensile strength above 1000&#x2212;50&#xd7;Al MPa, a uniform elongation above 15% and a low density is provided. The steel includes, by weight percent: The balance being Fe and impurities and the microstructure containing 25% to 90% of ferrite, 10% to 50% of austenite, kappa precipitates lower than 5% and martensite lower than 25%. The steel is able to be coated using total oxidation.

Cold rolled steel sheet and vehicle

A cold-rolled sheet is provided. The cold-rolled sheet includes a steel substrate with a carbon content Cbetween 0.07% and 0.5%, expressed by weight, and a metal pre-coating on at least the two principal faces of the steel substrate. The substrate has a decarburized area on the surface of each of the two principal faces. The depth pof the decarburized area is between 6 and 30 micrometers, and pis the depth at which the carbon content is equal to 50% of the content C. The sheet does not contain a layer of iron oxide between the substrate and the metal pre-coating.

Precoated sheets for manufacturing press-hardened coated steel parts

A cold-rolled sheet is provided. The cold-rolled sheet is annealed and pre-coated for the fabrication of press hardened parts, composed of a steel substrate for heat treatment with a carbon content Cbetween 0.07% and 0.5%, expressed by weight, and a metal pre-coating on at least the two principal faces of the steel substrate. The substrate comprises a decarburized area on the surface of each of the two principal faces. The depth pof the decarburized area is between 6 and 30 micrometers, and pis the depth at which the carbon content is equal to 50% of the content C. The sheet does not contain a layer of iron oxide between the substrate and the metal pre-coating. Processes are also provided.

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Montigny-les-Metz, France

Jonas Staudte