| 摘要 |
PURPOSE:To produce a grain-oriented silicon steel plate having a high magnetic flux density by subjecting a silicon steel slab contg. an adequate amt. of N, Al or B to hot rolling, annealing, cold rolling, pulse annealing and secondary recrystallization annealing under specific conditions. CONSTITUTION:A silicon steel slab contg. <0.01% C, 2.0-4.0% Si, and either one of <0.01% S and <0.005% Se, 0.005-0.05% total N2 and at least one of 0.01-0.08% SolAl and 0.0003-0.0040% B is heated to <=1,300 deg.C and is hot rolled to a plate material. The plate material is uniformly annealed in a temp. range of 900-1,100 deg.C and is thereafter cooled for 10-100sec. between 800-400 deg.C in the succeeding cooling process. The plate material is subjected to one time of cold rolling or two times of cold rolling including intermediate annealing to a final plate thickness and during or after primary recrystallization annealing performing commonly decarburization annealing, the steel plate surface is subjected repeatedly for a short time to pulse annealing involving high temp. heating and finally to secondary recrystallization annealing. The decarburization annealing is omitted if the content of C is <=0.003%. |
