| 摘要 |
PURPOSE:To manufacture a nonoriented electrical steel sheet having a fine shape and superior magnetism by subjecting a steel having a low Si and Al content to hot rolling, self-annealing, cooling in a time represented by a specified equation, pickling and cold rolling. CONSTITUTION:A steel contg. <=2.0% Si+Al is hot rolled, self-annealed for about 10-40min, and cooled to <=600 deg.C in a time (t) represented by the equation. The cooling is carried out while retaining the grains recrystallized uniformly to a prescribed grain size without forming coarse grains. The resulting plate is pickled and cold rolled to a prescribed final thickness. The thickness of the plate is uniformly reduced during the cold rolling, and a cold rolled steel sheet having a fine shape and superior magnetism is obtd. |
