High strength steel sheet and method for manufacturing the same

Details High strength steel sheet and method for manufacturing the same High strength steel sheet and method for manufacturing the same

C - Chemistry, Metallurgy

22

C

C22C 38/00 (2006.01) C21D 9/46 (2006.01) C22C 38/14 (2006.01) C23C 2/06 (2006.01)

Patent

CA 2616360

A steel sheet having a tensile strength as high as 980 MPa or above. It has a structure consisting substantially of a ferrite phase only and has dispersed/precipitated carbide particles containing Ti, Mo, and V and having an average particle diameter smaller than 10 nm, the carbides containing Ti, Mo, and V having an average composition satisfying the relationship V/(Ti+Mo+V)>=0.3 (atomic ratio). The steel sheet is excellent in both elongation and stretch flangeability, and is suitable for use in applications where the sheet is pressed so as to have a complicated sectional shape, as in the formation of automotive members.

Feuille d~acier dont la résistance à la traction peut dépasser 980 MPa. Cette feuille d~acier comporte une structure constituée sensiblement uniquement d'une phase de ferrite et comporte des particules de carbure dispersées/précipitées contenant du Ti, du Mo, et du V et présentant un diamètre de particule moyen inférieur à 10 nm, les carbures contenant du Ti, du Mo, et du V présentant une composition satisfaisant la relation V/(Ti+Mo+V)³0,3 (rapport atomique). La feuille d~acier selon l~invention présente à la fois une élongation et une capacité de former des bords étirés et rétreints élevées, et est adapté à une utilisation dans des applications où la feuille d'acier est comprimée pour créer une forme de section compliquée, comme dans la formation d'éléments automobiles.

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