Patent ID: 8999084
Filing Date: 2015-04-07
Classification: C21D,C22C,C23C,Y10T

Abstract:
1. A method for manufacturing a galvanized steel sheet, comprising: annealing and galvanizing a steel sheet in a continuous galvanizing line, wherein the steel sheet is galvanized such that the partial pressure (Po where [Si] represents a content in mass percent of Si in steel, [Mn] represents a content in mass percent of Mn in steel, and Po 2 represents a partial pressure (Pa) of oxygen, wherein the steel sheet contains a zinc plating layer, and an oxide of at least one selected from the group consisting of Fe, Si, Mn, Al, P, B, Nb, Ti, Cr, Mo, Cu, and Ni is present in a surface portion of the steel sheet that lies directly under the zinc plating layer and that extends up to 100 μm from the surface of a base steel sheet, the content of Si is from 0.001% to 0.2% by mass, and an amount of oxide per unit area is 0.05 g/m