| 摘要 |
PURPOSE:To obtain an extra thin steel plate having excellent formability, having small in-plane anisotropy and in which no breaking occurs as well at the time of continuous annealing, by subjecting the steel in which C, Si, Mn, P, S, N, Al, Ti and Nb are specified to rolling and annealing under prescribed conditions. CONSTITUTION:The steel plate contg., by weight, <=0.004% C, <=0.1% Si, <=0.5% Mn, <=0.025% P, <=0.025% S, <=0.006% N, 0.001-0.1% Al, 0.01-0.1% Ti, 0.003-0.03% Nb and 0.0001-0.001% B is refined. Said steel is hot rolled at 850-900 deg.C hot rolling finish temp. and at 300-600 deg.C winding temp. The steel is then cold rolled at 85-95% pressurizing ratio and is applied to the continuous annealing at 650-750 deg.C. Said steel is thereafter subjected to skin pass rolling, by which the extra thin steel plate having 0.15-0.6mm thickness is obtd.
|
