HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

摘要

An object of the invention is to provide a high-strength galvanized steel sheet based on a Si and Mn containing steel sheet and having an excellent surface appearance without bare-spot defects or blistering, and to provide a method for manufacturing such a steel sheet. The high-strength galvanized steel sheet includes a base steel sheet having a specific chemical composition and a zinc coating layer disposed on the surface of the base steel sheet in a coating weight per side of 20 g/m 2 to 120 g/m 2 , wherein the amount of hydrogen measured by a specific method is 0.05 mass ppm to 0.40 mass ppm; and I Si sur /I Si bulk and I Mn sur /I Mn bulk calculated by a specific method are not more than 2.0 and not more than 3.0, respectively.