High-strength steel sheet, hot-dipped steel sheet, and alloy...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 38/14 (2006.01) C21D 8/02 (2006.01) C21D 9/46 (2006.01)

Patent

CA 2759256

Provided is a high-strength steel sheet that contains, by mass, 0.030.10% carbon, 0.011.5% silicon, 1.02.5% manganese, no more than 0.1% phosphorus, no more than 0.02% sulfur, 0.011.2% aluminum, 0.060.15% titanium, and no more than 0.01% nitrogen, with the remainder comprising iron and unavoidable impurities. The steel sheet has a tensile strength of at least 590 MPa and a tensile strength/yield strength ratio of at least 0.80. The microstructure of the steel sheet comprises bainite with an area ratio of at least 40%, with the remainder comprising ferrite and/or martensite. The density of Ti(C, N) deposits no larger than 10 nm is at least 1010 deposits per mm3, and the ratio (Hvs/Hvc) between the hardness at a depth of 20 µm from the surface (Hvs) and the hardness at the center of the thickness of the sheet (Hvc) is at least 0.85.

L'invention porte sur une tôle d'acier à haute résistance qui contient, en masse, 0,030,10 % de carbone, 0,011,5 % de silicium, 1,02,5 % de manganèse, pas plus de 0,1 % de phosphore, pas plus de 0,02 % de soufre, 0,011,2 % d'aluminium, 0,060,15 % de titane et pas plus de 0,01 % d'azote, le reste comprenant du fer et des impuretés inévitables. La tôle d'acier a une résistance à la traction d'au moins 590 MPa et un rapport résistance à la traction/limite élastique d'au moins 0,80. La microstructure de la tôle d'acier comprend de la bainite en une proportion surfacique d'au moins 40 %, le reste comprenant de la ferrite et/ou de la martensite. La densité de dépôts de Ti(C, N) de taille inférieure ou égale à 10 nm est d'au moins 1010 dépôts par mm3 et le rapport (Hvs/Hvc) entre la dureté à une profondeur de 20 µm à partir de la surface (Hvs) et la dureté au centre selon l'épaisseur de la tôle (Hvc) est d'au moins 0,85.

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