| 摘要 |
<p>PURPOSE: A high strength steel sheet having high yield ratio and a manufacturing method thereof are provided to reduce manufacturing costs and improve the curing capacity and strength by adjusting the addition amount of the chrome. CONSTITUTION: A high strength steel sheet having high yield ratio comprises C 0.02~0.20 weight%, Si 0~1.5 weight%, Mn 1.5~3.0 weight%, P 0.001~0.10 weight%, S 0~0.010 weight%, Al 0.01~0.40 weight%, N 0~0.020 weight%, Cr 0.3~1.5 weight%, B 0.0010~0.0060 weight%, Sb 0.001~0.10 weight%, Ti 0.003~0.08 weight%, Nb 0.003~0.08 weight%, and the rest including Fe and inevitable impurities.</p> |
