Patent ID: 7118809
Filing Date: 2006-10-10
Classification: C21D,Y10T

Abstract:
1. A hot-dip galvanized steel sheet, wherein 95 area % or more of a steel of the hot-dip galvanized steel sheet is ferrite and martensite, wherein the steel of the hot-dip galvanized steel sheet comprises, by mass % (the contents of the following elements being expressed in the same manner), C: 0.05 to 0.12%, Si: not more than 0.05%, Mn: 2.7 to 3.5%, Cr: 0.2 to 0.5%, Mo: 0.2 to 0.5%, Al: not more than 0.10%, P: not more than 0.03%, and S: not more than 0.03%, and wherein the hot-dip galvanized steel sheet has a tensile strength in a range from 780 to 1180 MPa and a ductility ratio of 0.40 or more, the ductility ratio being a ratio of cross tensile strength to shear tensile strength.