| 摘要 |
<p>A non-oriented electrical steel sheet having a high magnetic flux density in a rolling direction of the steel sheet is produced by hot rolling a raw steel material comprising C: not more than 0.03 mass%, Si: not more than 4 mass%, Mn: 0.03ˆ¼3 mass%, Al: not more than 3 mass%, S: not more than 0.005 mass%, N: not more than 0.005 mass% and the balance being Fe and inevitable impurities, and then cold rolling and finishing annealing to produce a non-oriented electrical steel sheet, characterized in that a crystal grain size before the cold rolling is rendered into not more than 100 µm and the finishing annealing is conducted by rapidly heating up to a temperature exceeding recrystallization temperature at an average temperature rising rate of not less than 100°C/sec.</p> |
