| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength cold rolled steel sheet having low in-plane anisotropy of yield strength and excellent press formability.SOLUTION: A high strength cold rolled steel sheet has a composition comprising by mass%, C: 0.06 to 0.12%, Si: not more than 0.7%, Mn: 1.2 to 2.6%, P: not more than 0.020%, S: not more than 0.03%, sol. Al: 0.01 to 0.5%, and N: not more than 0.005%, with the balance being Fe and inevitable impurities, and has a structure comprising a ferrite phase in a volume ratio of 60% or more as a main phase and a martensite phase in a volume ratio of 5% or more and not more than 20%, relative to the whole steel sheet structure, with a three dimensional crystal orientation distribution function at {&phgr;1, Φ, &phgr;2}={0°, 35°, 45°} made to be not higher than 2.5. |
