| 摘要 |
PURPOSE:To improve the adhesion and press workability by introducing a steel sheet contg. specified amounts of C, Si, Mn, P, etc., into a hot dip galvanizing tank and by forming an alloy layer of a prescribed thickness between the steel sheet and a Zn layer formed by hot dip galvanizing. CONSTITUTION:A steel sheet consisting of <=0.07% C, <=0.1% Si, <=0.4% Mn, <=0.03% P, <=0.03% S, <=0.1% Al, <=0.007% N, 0.003-0.04% Ti, 0.003-0.04% Nb and the balance Fe is introduced into a hot dip galvanizing tank, where the steel sheet is coated with a Zn layer of 4-30mum thickness by hot dip galvanizing. At this time, an alloy layer formed between the steel sheet and the Zn layer is regulated to 1/4-3/4 of the total thickness of the Zn layer and the alloy layer.
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