| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot dip galvanized steel sheet which is satisfactory in surface property without causing any stripe pattern, and has excellent press formability and secondary working brittleness resistance. SOLUTION: The steel sheet has a composition containing, by mass, 0.0005 to <0.010% C,≤1.0% Si, 0.05 to 2.50% Mn, >0.015 to 0.10% P, <0.010% S, <0.0050% sol.Al,≤0.005% N, 0.003 to 0.20% sol.Ti, 0.010 to 0.20% Nb,≤0.015% O and 0.0002 to 0.0030% B, and in which the contents of sol. Ti and Nb satisfy relational formulae (1) to (3), and the balance Fe with impurities, and in which the content of Ti oxides in oxide inclusions is≥50.0% expressed in terms of TiO<SB>2</SB>and the content of Nb oxides is <1.0% expressed in terms of NbO. COPYRIGHT: (C)2010,JPO&INPIT
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