| 摘要 |
PROBLEM TO BE SOLVED: To provide a producing method for producing a high-strength galvanized steel plate excellent in a plating adhesion and a surface appearance, while suppressing a problem to be caused by an oxide to be formed on a steel plate surface containing Cr, and a producing method for producing a high-strength alloy molten galvanized steel plate.SOLUTION: A high-strength galvanized steel plate is manufactured by a method comprising: a first heating step of holding a steel plate of a specific component composition in a specific Hconcentration, in a specific dew-point atmosphere, at a specific temperature and for a specific time period; a cooling step of cooling the steel plate after the first heating step; an electrolytic treatment step of performing electrolytic treatment on the steel plate after the cooling step, under a specific condition; a second heating step of holding the steel plate after the electrolytic treatment, in a predetermined Hconcentration, in a predetermined dew-point atmosphere and at a predetermined temperature for a predetermined time period; and a plating treatment step of subjecting the steel plate after the second heating step, to a molten zinc plating treatment.SELECTED DRAWING: None |
