Galvanized steel sheet and method for producing the same

C - Chemistry – Metallurgy – 22 – C

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C22C 38/38 (2006.01) C21D 8/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/18 (2006.01) C23C 2/06 (2006.01) C23C 2/40 (2006.01)

Patent

CA 2632112

A galvanized steel sheet excellent in strength--ductility balance and bake-hardenability as well as a method for producing the same are provided. The chemical components thereof include C, Si, Mn, P, S, Al, N and Cr at content ratios of 0.005 to 0.04%, 1.5% or lower, 1.0 to 2.0%, 0.10% or lower, 0.03% or lower, 0.01 to 0.1%, less than 0.008% and 0.2 to 1.0%, respectively, with Mn (mass%) + 1.29Cr (mass%) being in the range of 2.1 to 2.8, and further include iron and unavoidable impurities as the balance. The structure thereof consists of a ferrite phase and a martensite phase with a volume fraction being at least 3.0% and less than 10%, the average particle diameter of the ferrite is larger than 6 µm and not more than 15 µm, and 90% or more of the martensite phase exists in a ferrite grain boundary. In addition, in the production process of such a galvanized steel sheet, a steel sheet obtained in a cold rolling step is annealed at a temperature being at least the Ac1 point and not more than the Ac3 point.

La présente invention concerne des tôles d~acier enduites de zinc par immersion à chaud excellentes en termes d~équilibre entre la résistance et la ductilité et de trempabilité et son procédé de production. Les tôles d~acier ont une composition chimique contenant de 0,005 à 0,04 % de C, 1,5 % ou moins de Si, de 1,0 à 2,0 % de Mn, 0,10 % ou moins de P, 0,03 % ou moins de S, de 0,01 à 0,1 % d~Al, moins de 0,008 % de N et de 0,2 à 1,0 % de Cr et satisfaisant la relation : 2,1 <= Mn (% en masse) + 1,29 Cr (% en masse) <= 2,8, le complément étant constitué de fer et d~impuretés inévitables, et ont une structure constituée de ferrite et de 3,0 à moins de 10 % en volume de martensite et dans laquelle le diamètre moyen des grains de ferrite dépasse 6 µm et vaut jusqu~à 15 µm, au moins 90 % de la martensite existant dans les surfaces de contour des grains de ferrite. Dans la production des tôles d'acier enduites de zinc par immersion à chaud, les tôles d'acier laminées à froid sont recuites dans la gamme de température d~Ac1 à Ac3.

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