Method for manufacturing grain-oriented electrical steel sheet, and grain-oriented electrical steel sheet

A method for manufacturing a grain-oriented electrical steel sheet comprising:

• heating a steel slab to a slab extraction temperature Tr (° C.) of 1380° C. or lower by induction heating and holding the steel slab at a temperature T satisfying a range of Tr−10° C.≤T≤Tr+10° C. for at least 5 minutes, the steel slab containing
• C:
• 0.030 mass % to 0.085 mass %,
• Si:
• 2.00 mass % to 4.50 mass %,
• Mn:
• 0.03 mass % to 0.50 mass %,
• S:
• 0.0005 mass % to 0.0300 mass %,
• sol.Al:
• 0.005 mass % or more and less than 0.025 mass %,
• N:
• 0.0030 mass % to 0.0090 mass %, and
• at least one element selected from the group consisting of P, As, and Sb:
• 0.005 mass % to 0.500 mass %, where sol.Al/N satisfies 1.7 or more and 3.0 or less, with the balance being Fe and inevitable impurities,
• wherein, an average current value flowing through the slab is monotonically decreased as heating time passes, and the induction heating is performed with a frequency of 20 Hz to 1000 Hz,
• subjecting the slab to finish rolling to obtain a hot-rolled sheet, wherein a rolling finish temperature at one or both of a leading or trailing end of the hot-rolled sheet is set to 950° C. or lower,
• subjecting the hot-rolled sheet to hot band annealing with soaking at a temperature of 750° C. or higher and 1170° C. or lower for 5 seconds or more and 90 seconds or less to obtain a hot band annealed sheet,
• subsequently, cold rolling the hot band annealed sheet once, or twice or more with intermediate annealing performed therebetween to obtain a cold-rolled sheet with a final sheet thickness, and
• subjecting the cold-rolled sheet to primary recrystallization annealing followed by secondary recrystallization annealing.