| 摘要 |
PURPOSE:To obtain excellent magnetic characteristics in a line necessitating low equipment investment with high productivity in production of a silicon steel sheet having a specific compsn., by controlling the change in a cooling rate in the cooling process of a finish annealing stage to a specific value or below. CONSTITUTION:A silicon steel slab contg., by weight, <=0.01% C, <=4.0% Si, 0.1-1.0% Mn, and <=1.0% Al is subjected to hot rolling then to one pass or two passes of cold rolling including intermediate annealing to a cold rolled sheet having a final sheet thickness. The non-oriented silicon steel sheet is thereafter produced by a series of stages in which the finish annealing is executed. The change in the cooling rate in the cooling process of the finish annealing stage is limited to <=10 deg.C/s<2> in this process for production. The change in the cooling rate from a soaking temp. down to the prescribed cooling rate in the cooling process of the annealing stage is restricted to <=10 deg.C/s<2> in the above- mentioned manner, by which the fully satisfactory magnetic characteristics are obtd. in spite of the subsequent cooling at a high speed.
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