| 摘要 |
A precipotaton hardening high strength cold rolled steel sheet comprises 0.03 to 0.25% C, not more than 1.5% Si, 0.6 to 2.5% Mn, 0.01 to 0.15% Al, 0.01 to 0.40% effective Ti total Ti% - 3.4 N% - 1.50% -1.5 S% and satisfying 4 C%-0.6% < effective Ti <4 C% , with the balance being Fe and unavoidable impurities.
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