POSCO Holdings Inc.
HIGH-STRENGTH GALVANIZED STEEL SHEET HAVING EXCELLENT ELECTRICAL RESISTANCE SPOT WELDABILITY, AND METHOD FOR PRODUCING SAME

Abstract:

Provided is a galvanized steel sheet having excellent spot weldability; and a method for producing same. The galvanized steel sheet includes a base steel sheet and a zinc-based plating layer formed on the base steel sheet, wherein the surface layer of the base steel sheet may have a decarburization rate of at least 30% as represented by equation 1. [Equation 1]: Decarburization rate (%) of surface layer=(1-average carbon concentration in surface layer/bulk carbon concentration)*100, where the surface layer refers to a region extending to a depth of 35 .mu.m from the surface of the base steel sheet.