| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-strength hot-dip galvanized steel sheet which is composed of a high Si-containing steel sheet as a base material and has excellent plating peeling resistance. SOLUTION: In the high-strength hot-dip galvanized steel sheet, the surface of a steel sheet having a composition containing, by mass, 0.01 to 0.15% C, 0.8 to 2.0% Si, 1.0 to 3.0% Mn,≤0.025% P and≤0.01% S, and the balance Fe with inevitable impurities has a galvanizing layer thereon. In the surface layer part of the steel sheet in a range from the boundary between the plating layer and the steel sheet to 5μm, the oxide of Si is present by≥0.05g/m<SP>2</SP>in terms of an Si content, the oxide of Mn is present by≥0.05 g/m<SP>2</SP>in terms of an Mn content, and also, the total content of the Si content and the Mn content is≥0.15 g/m<SP>2</SP>. COPYRIGHT: (C)2011,JPO&INPIT |
