| 摘要 |
<p>A high-strength galvanized steel sheet having a low YP, good stretch flangeability, and excellent corrosion resistance and a method for manufacturing the same are provided. The steel sheet contains, on a percent by mass basis, more than 0.015% to less than 0.10% of C, 0.5% or less of Si, 1.0% to 1.9% of Mn, 0.015% to 0.050% of P, 0.03% or less of S, 0.01% to 0.5% of sol. Al, 0.005% or less of N, less than 0.40% of Cr, 0.005% or less of B, less than 0.15% of Mo, 0.4% or less of V, and less than 0.020% of Ti, in which 2.2‰¤[Mneq]‰¤3.1 and [%Mn]+3.3[%Mo]‰¤1.9, and [%Mn]+3.3[%Mo])/(1.3[%Cr]+8[%P]+150B*)<3.5 are satisfied. A steel has a microstructure consists of ferrite and second phases, the volume fraction of the second phase is 2% to 12%, and as the second phase, martensite having a volume fraction of 1% to 10% and retained ³ having a volume fraction of 0% to 5% are contained.</p> |
