| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of producing a high-strength galvanized steel sheet having an excellent plating appearance and excellent corrosion resistance, plating peeling resistance in high processing and processability by using a high-strength steel sheet containing Si and Mn as base material sheet and a high-strength galvanized steel sheet.SOLUTION: The concentration of hydrogen in an atmosphere is controlled in such a relatively low temperature range that surface enrichment occurs while internal oxidation does not occur sufficiently, and the dew point in the atmosphere is controlled in a limited temperature range. More specifically, the concentration of hydrogen in an atmosphere in the temperature range of a heating furnace of 500°C to A°C (A:520≤A≤600) is controlled so as to be 15 vol.% or higher, and the dew point in the atmosphere in the temperature range of higher than A°C and equal to or lower than B°C (B:550≤B≤700) is controlled so as to be -10°C or higher. |
