Patent ID: 9728312
Date: 2017-08-08
CPC Classifications: B21B,C21D,C22C,H01F

Claim:
1. A manufacturing method of a non-oriented electrical steel sheet, comprising: on a slab having a steel composition containing, in mass %, C: 0.005% or less, Si: 0.2% to 0.7%, Mn: 0.05% to 0.6%, P: 0.100% or less, Al: 0.5% or less, and a balance being composed of Fe and inevitable impurities, performing hot rolling to obtain a hot-rolled steel sheet; performing cold rolling on the hot-rolled steel sheet to obtain a cold-rolled steel sheet; and performing finish annealing on the cold-rolled steel sheet, wherein; in the hot rolling, a heating temperature of the slab is set to 1050° C. to 1250° C., a finish rolling finishing temperature is set to 850° C. to an Ar1 transformation point+20° C., and as part of the hot rolling, a coil winding temperature is set to 820° C. or higher, and an annealing temperature in the finish annealing is set to 800° C. to an Ac1 transformation point.