High-strength hot-dip galvanized steel sheet excellent in impact resistance peelability and machined portion corrosion resistance

摘要

A hot-dip galvanized steel sheet having a hot-dip galvanized layer having a tensile strength of 590 MPa or more on a steel sheet base material, wherein the hot-dip galvanized steel sheet has a convex-shaped alloy layer in contact with the steel sheet base material, And the maximum diameter of the convex shaped alloy layer at the interface is not more than 100 mu m per unit length of the interface between the steel sheet base material and the plating layer, and the finely divided layer directly contacting the interface between the steel sheet base material and the plating layer A decarburized layer in contact with the finer layer and present on the inner side of the base material of the steel sheet and an inner layer other than the finely divided layer and the decarburized layer, wherein the finely divided layer, the decarburized layer and the convex- Mn, and at least one of the oxides.