Patent ID: 9748028
Date: 2017-08-29
CPC Classifications: C21D,C22C,H01F

Claim:
1. A method of producing a grain-oriented electrical steel sheet, the method comprising: hot rolling a steel slab to form a hot rolled steel sheet, the steel slab having a chemical composition comprising: optionally hot band annealing the steel sheet; subjecting the hot rolled sheet to a final thickness by (i) single cold rolling or (ii) two or more cold rollings including an intermediate annealing therebetween; primary recrystallization annealing the cold rolled steel sheet by heating at a heating rate of not more than 10° C./s for a period of 1 to 7 seconds within a temperature zone in a range of 250° C. to less than 550° C. and rapidly heating at an average heating rate in a range of 40 to 200° C./s at a temperature in a range of 550° C. to 700° C.; and thereafter applying an annealing separator to perform final annealing.