| 摘要 |
PURPOSE:To produce a high grade non-directional silicon steel sheet having a low iron loss and a high magnetic flux density by decreasing considerbly S, O and N among the impurities contained unavoidably in a blank material for a silicon steel and annealing a base strip under specific conditions after hot rolling then cold rolling the strip at a high draft. CONSTITUTION:A blank material for a silicon steel contg., by weight %, <=0.005 % C, 2.5-4.0% Si, 0.25-1.00% Al, and 0.1-1.0% Mn is hot rolled by an ordinary method. A base strip is annealed and is then made into a final plate thickness by one time of a cold rolling method, in succession to which the strip is subjected to continuous finish annealing. The S, O and N among the impurities contained unavoidably in the blank materal are considerably decreed to <=15ppm, <=20ppm and <=25ppm respectively in the above-mentioned stage. The annealing of the base strip is accomplished under the conditions of 900-1,050 deg.C and 2- 15min. The draft in the cold rolling is set at >=65%. The non-directional silicon steel sheet having an extremely outstanding magnetic characteristic is thus produced. |
