Patent ID: 7465361

Claim:
A method for manufacturing a grain-oriented electrical steel sheet, comprising the steps of: rolling a steel slab containing 0.08 mass percent or less of carbon, 2.0-8.0 mass percent of Si, and 0.005-3.0 mass percent of Mn into a cold-rolled steel sheet; subsequently performing decarburizing annealing of the cold-rolled steel sheet if desired; subsequently applying an annealing separator to the cold-rolled steel sheet if desired; performing secondary-recrystallization annealing of the cold-rolled steel sheet; and subsequently performing purification annealing of the cold-rolled steel sheet, wherein the steel slab contains less than 100 ppm of Al and not more than 50 ppm each of N, S, and Se and the remainder being Fe and inevitable impurities, the purification annealing is performed at 1050° C. or more, and the partial pressure of hydrogen in the atmosphere is adjusted to 0.4 atm or less in a temperature range above 1170° C. for a purification annealing conducted at a temperature above 1170° C., or 0.8 atm or less in a temperature range of 1050° C. or more for a purification annealing conducted at a temperature of 1170° C. or less.