| 摘要 |
PURPOSE:To surely and stably produce a grain-oriented silicon steel sheet having excellent magnetic characteristics by subjecting a silicon steel billet having the specific compsn. consisting of C, Si, Mn, S, Se, Al, N, and Fe adequately repeatedly to cold rollings and specific intermediate annealings. CONSTITUTION:The silicon steel billet contg. 0.01-0.06wt% C, 2.0-4.0% Si, 0.01-0.20% Mn, 0.005-0.1% at least either of S and Se, 0.01-0.09% Sol.Al, and 0.001-0.01% N, further contg. 0.005-0.20% Sb and 0.003-0.10% Mo, and consisting of the balance substantially consisting of Fe except unavoidable impurities is hot rolled. The hot rolled sheet is subjected to homogenization annealing and is then subjected adequately repeatedly to the cold rollings and intermediate annealings. The heating rate from 500 deg.C up to 900 deg.C and the cooling rate from 900 deg.C down to 500 deg.C after the intermediate annealing are respectively set at >=5 deg.C/sec in the stage of the above-mentioned intermediate annealing. The cold rolled sheet of the final product thickness obtd. in the above-mentioned manner is subjected to the primary recrystallization annealing in common use as decarburization and the final finish annealing to develop the secondary recrystal grains of the {110}<001> orientation. |
