| 摘要 |
PROBLEM TO BE SOLVED: To provide a cold-rolled steel sheet which is excellent in surface quality after molding and is useful as an automotive exterior and interior panels.SOLUTION: The cold-rolled steel sheet has a composition comprising, by mass%, 0.0005-0.0050% C, ≤0.30% Si, ≤0.50% Mn, ≤0.050% P, ≤0.020% S, 0.010-0.100% Ti, ≤0.080% sol. Al, ≤0.0070% N, provided that C, N, S and Ti satisfy the following relation (1): ([%Ti]/48-[%N]/14-[%S]/32)/([%C]/12)≥1.00 (wherein [%M] represents element M content in steel (mass%)), and the balance being Fe and unavoidable impurities. |
