| 摘要 |
PURPOSE:To improve magnetic flux density by applying rolling by means of longitudinally grooved upper and lower rolls to a part of rollings prior to the annealing of a hot rolled plate. CONSTITUTION:A hot rolled strip of a steel having a composition consisting of, by weight, <=0.01% C, <=7.0% Si, 0.1-1.5% Mn, <=0.1% P, <0.01% S, <=0.001% or 0.05-1.0% Al, <=0.005% N, and the balance Fe is used. This steel strip is subjected, if necessary, to annealing, cold-rolled or warm-rolled once or subjected to cold rolling or warm rolling twice or more while process-annealed between the cold or warm rolling stages, and then annealed, by which a silicon steel sheet is obtained. At this time, in the above cold or warm rolling stage, rollings in one or more passes not including the final pass are carried out by using the upper and the lower roll which has longitudinal grooves formed in a manner to be arranged so that they are equally spaced in the longitudinal direction of the roll in the peripheral direction of the roll surface and in which respective sectional forms of the grooves in the upper and the lower roll are identical and the deviation (e)(mm) of a groove pitch (l)(mm) between the upper and the lower roll satisfies an inequality. Then, rollings in one or more passes including the final pass are carried out by using smooth rolls as the upper and the lower roll. |
