| 摘要 |
PURPOSE:To manufacture a grain oriented electrical sheet having low iron loss, by regulating strictly quantitites of Mn, S, adding a prescribed quantity of Cu, and selecting suitable conditions of hot rolling, hot rolled plate annealing or intermediate annealing. CONSTITUTION:A silicon steel slab having basic component of <=0.08% C, 12- 4% Si is hot rolled to hot coil, and hot rolled plate annealing, cold rolling, intermediate annealing, cold rolling and decarbonization annealing are performed. Then high temp. annealing for recrystallizing secondarily said meterial at 800-950 deg.C is performed to manufacture the grain oriented electrical sheet. Hereupon, a material in which 0.05-0.07% Mn, 0.02-0.2% Cu, 0.015-0.03% S are incorporated to the silicone steel material, and <=500Angstrom fine (Cu, Mn)1.8S accompanying to gamma-alpha transformation are deposited, is subjected to the final cold rolling by 50-80% draft. |
