Arcelormittal

Clément Philippot

Martin Beauvais

Alice Dumont

Matthieu Salib

David Dussaussois

Doriane Serra

Hubert Salmon Legagneur

Deborah Herry

Sandra Le Guillard

A hot-stamped coated steel part includes a steel substrate and an aluminum alloy coating comprising, proceeding from steel substrate outwards, an interdiffusion layer and an outer layer. The total thickness of the coating eand the thickness of the interdiffusion layer esatisfy the following condition: The hot-stamped coated steel part comprises an undeformed portion having a thickness efrom 0.6 mm to 3.5 mm, and at least one deformed portion. A lineic density of cracks dC in the coating in the undeformed portion is higher than or equal to a minimum lineic density of cracks dC(e) defined as:

Crack-containing hot-stamped coated steel part with excellent spot-weldability and excellent painting adhesion

A coated steel sheet and press hardened steel part having a composition including, by weight percent: C 0.15-0.25%, Mn 0.5-1.8%, Si 0.1-1.25%, Al 0.01-0.1%, Cr 0.1-1.0%, Ti 0.01-0.1%, B 0.001-0.004%, P≤0.020%, S≤0.010%, N≤0.010% the remainder of the composition being iron and unavoidable impurities resulting from the smelting. The press hardened steel part includes a bulk having a microstructure including, in surface fraction, more than 95% of martensite and less than 5% of bainite, a coating layer at the surface of the steel part, a ferritic interdiffusion layer between the coating layer and the bulk, and a ratio between the ferritic grain width in the interdiffusion layer GWover prior austenite grain size in the bulk PAGS, satisfying following equation (GW/PAGS)−1≥30%.

Coated steel sheet and high strength press hardened steel part and method of manufacturing the same

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Ennery, France

Clément Philippot