| 摘要 |
<p>A process for producing grain oriented magnetic sheets by subjecting a steel slab≰100 mm, containing 2.5-3.5% si, to the following operations: optional first heating, to a temperature T1≰1250° C.; first rough hot-rolling at T2 between 900 and 1200° C., the reduction ratio (% Rid) being at least 80% in the absence of a subsequent heating or, in the presence of a subsequent heating to T3≰1300° C., at least 60% determined by % Rid=80−(T3−T2)/5; second finishing hot-rolling at T4<1300° C. to a rolled-section thickness of 1.5 3.0 mm; cold-rolling, in one or more stages with optional intermediate annealing and with a cold reduction ratio≧60% applied in the last stage; primary recrystallization annealing, optionally in a decarburizing atmosphere; second recrystallization annealing.</p> |
