| 摘要 |
Provided is a hot-rolled steel sheet material making possible low cost production of thin cold-rolled steel sheet, surface treated cold-rolled steel sheet, and the like, even on a cold rolling mill of low rolling capacity, and a method for producing the same. The hot-rolled steel sheet for cold rolling material includes, in mass %, 0.016-0.07% C, no more than 0.1% Si, 0.05-0.5% Mn, no more than 0.03% P, no more than 0.03% S, 0.02-0.1% Sol.Al, no more than 0.005 wt % N, 0.0003-0.0030% B, no more than 0.004% Ti, and no more than 0.003% Nb, the remainder having a chemical composition comprising Fe and unavoidable impurities, and the average crystal particle size being no greater than 13 µm and the aging index (AI) being no greater than 10 MPa. |
