| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hot-rolled steel plate as a material for cold-rolling and a manufacturing method therefor, with which a thin steel sheet after cold-rolling and the steel sheet obtained by applying the surface treatment to the thin steel plate can be manufactured at low cost, even with a cold-rolling mill having small rolling capacity. <P>SOLUTION: The hot-rolled steel plate as the material for cold-rolling has a chemical composition composed, by mass, of 0.016-0.07% C, ≤0.1% Si, 0.05-0.5% Mn, ≤0.03% P, ≤0.03% S, 0.02-0.1% sol.Al, ≤0.005% N, 0.005-0.03% Ti and the balance Fe with inevitable impurities, and has an average crystal grain diameter of ≤13 μm and the aging index AI of ≤10 MPa. <P>COPYRIGHT: (C)2013,JPO&INPIT |
