Manufacturing method and a method of manufacturing a non-oriented electrical steel sheet of non-oriented electrical steel sheet for hot-rolled steel sheet

摘要

PROBLEM TO BE SOLVED: To provide a non-oriented electromagnetic steel sheet with a magnetic flux density improved by making minute the structure before hot rolling and after slab heating so as to make minute the structure of the hot-rolled sheet.;SOLUTION: In producing a non-oriented electromagnetic steel sheet with a slab produced by continuous casting as raw material, taking the temperature at which the slab transforms from an austenite phase to a ferrite phase as the temperature A₃, the surface temperature of the slab is kept at a temperature lower than the temperature A₃ for 10 s or longer, and the treatment of keeping at a temperature equal to or higher than the temperature A₃ for 10 s or longer once, twice or more.;COPYRIGHT: (C)2015,JPO&INPIT