| 摘要 |
PURPOSE: To produce a nonoriented silicon steel sheet having high magnetic flux density and reduced in iron loss with high productivity by subjecting a slab of a steel minimal in impurity content to hot rolling, coiling at specific temp., and cold rolling and then annealing the resulting cold rolled steel sheet. CONSTITUTION: A slab of high purity steel, having a composition consisting of, by weight, <0.005% C, 0.1-2.0% Si, 0.1-1.5% Mn, <0.003% S, <0.002% N, <0.003% Ti, <0.003% V, <0.005% Nb, and the balance Fe, is hot-rolled and the resulting hot rolled plate is coiled at a temp. between 700 deg.C and the A1 transformation point. This hot rolled steel plate is cold-rolled once or is cold- rolled two or more times while process-annealed between the cold rolling stages into a cold rolled steel sheet of prescribed sheet thickness, or further, skin pass rolling is done at 2-12% draft, if necessary. By this method, the nonoriented silicon steel sheet, having high magnetic flux density and reduced in iron loss, can be produced with high productivity at low manufacturing cost. |
