Cold rolled steel sheet having improved bake hardenability

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/14 (2006.01) C22C 38/00 (2006.01) C22C 38/04 (2006.01) C22C 38/12 (2006.01)

Patent

CA 2301722

Cold rolled steel sheets having improved bake hardenability is provided. Specifically, the present invention relates to a cold rolled steel sheet, with improved bake hardenability, comprising an ultra low carbon steel containing titanium and/or niobium, wherein the relationship between the contents of carbon and molybdenum in solid solution being regulated in a specified range, and a cold rolled steel sheet, with improved bake hardenability, which further contains a specified amount of boron in addition to the above constituents.

L'invention concerne une tôle d'acier laminée à froid présentant une excellente aptitude à la trempe par cuisson et comprenant de l'acier à très faible teneur en carbone contenant Ti et/ou Nb, caractérisée en ce que la relation entre les contenus de Mo et de carbone ayant participé à une solution solide est limitée à une plage spécifique, et la tôle d'acier laminée à froid précitée présente une excellente aptitude à la trempe par cuisson contenant également B en une quantité spécifique.

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