| 摘要 |
PROBLEM TO BE SOLVED: To provide a producing method for a high tensile strength hot dip galvanized steel sheet by which the problem of nonplating in hot dip galvanizing for an Si added high tensile strength steel sheet can be solved without adding equipment and process. SOLUTION: As to the producing method for a high tensile strength hot dip galvanized steel sheet, in the production of a zinc plated steel sheet containing, by mass, >=0.3% Si and moreover containing one or two kinds of <=3% Ni and <=3% Cu so as to satisfy (1.5×Ni+Cu)>=1.5%, pickling is performed for 1 to 15 min in a pickling bath in which the concentration of hydrochloric acid is 8 to 37 mass %, and the bath temperatue is 80 to 95 deg.C and, after that, hot dip galvanizing is performed.
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