| 摘要 |
PURPOSE: To obtain excellent magnetic characteristics and superior workability by providing a composition containing specific amounts of Si and also containing C, S, N, O and B in amounts made to specific values or below, respectively, specifying average crystal grain size, and regulating the area ratio of such crystal grains that have crystal face orientation within specific angle with respect to the <111> axis at the surface of a steel sheet to a specific percentage or below. CONSTITUTION: The non-oriented silicon steel sheet has a composition containing, by weight, 2.0-4.0% Si and containing C, S, N, O and B in amounts made to less than 50 ppm respectively and also has 50-500 μm average grain size, and further, the area ratio of grains having crystal face orientation within 15°with respect to the <111> axis at the steel-sheet surface is regulated to less than 20%. This steel sheet can be manufactured by forming a molten steel of this composition into slab, hot rolling the slab, carrying out hot rolled plate annealing if necessary, cold rolling the resultant place once or cold rolling it two or more times while performing process annealing between cold rolling steps to finish it into final sheet thickness, and then applying recrystallization annealing to the resultant sheet.
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