公开(公告)号：US5082509A

公开(公告)日：1992-01-21

申请号：US508772

申请日：1990-04-12

申请人： Yoshiyuki Ushigami ,  Toyohiko Konno ,  Yozo Suga ,  Kiyoshi Ueno ,  Mikio Itoh ,  Toshio Nishiyama ,  Kenichi Takimoto

发明人： Yoshiyuki Ushigami ,  Toyohiko Konno ,  Yozo Suga ,  Kiyoshi Ueno ,  Mikio Itoh ,  Toshio Nishiyama ,  Kenichi Takimoto

IPC分类号： C21D8/12

CPC分类号： C21D8/1255 ,  C21D8/1283

摘要： A method of producing an oriented electrical steel sheet having superior magnetic properties comprises the steps of, hot rolling a slab containing 0.8 to 6.8% of Si, 0.008% of Al acid soluble, the balance being Fe and accompanying impurities, by weight to form a strip, cold rolling the strip, primary-recrystallization annealing, coating the strip with an annealing separator, and finishing annealing, a nitriding treatment being effected after the primary recrystallization annealing but before the start of the secondary recrystallization of the finishing annealing. According to the present invention, with an atmosphere oxidizing degree (PH.sub.2 O/PH.sub.2): x in a soaking process in said primary recrystallization annealing an annealing is effected in an atmosphere which has an oxidizing degree (PH.sub.2 O/PH.sub.2): y in a range defined by the following inequality, at a temperature ranging from 650.degree. to 800.degree. C. in the heating process, for at least 5 secs. ##EQU1##