| 摘要 |
PURPOSE:To manufacture a silicon steel sheet having superior soft magnetic characteristics by specifying the composition of an Fe alloy and selecting conditions during finish hot rolling in accordance with the structure before the finish hot rolling. CONSTITUTION:An Fe alloy contg., by weight, 4-7% Si, <0.5% Mn, <0.1% P, <0.02% Si and <2% Al is manufactured by melting. The alloy is cast by ingot making or continuous casting and rough rolled at >=1,000 deg.C and >=50% total draft. Cogging and rough rolling may be carried to in place of the rough rolling. The resulting plate is subjected to finish hot rolling at a total draft R represented by formula I or II in accordance with the average grain size (d) of the plate before the finish hot rolling, and then coiling at <=750 deg.C, descal ing, cold rolling, warm rolling and annealing are carried out. In case of d>lambda0 [lambda0=1.9-0.26XSi(wt%)], the total draft R (%) is represented by the formula I. In case of d<=lambda0, the total draft R (%) is represented by the formula II.
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