| 摘要 |
A grain-oriented electromagnetic steel sheet having a forsterite base film and an insulating tension coating on the surface thereof, wherein if magnetic domain refinement processing is performed by using a laser beam, a plasma flame, or electron beam irradiation, a sufficient iron loss reduction effect is achieved within a range in which film peeling does not occur, said effect being achieved by: the relationships FX(Ti)/FX(Al) ≥ 0.15 and FX(Ti)/FX(Fe) ≥ 0.004 being satisfied if FX(Ti) is Ti strength, FX(Al) is Al strength, and FX(Fe) is Fe strength when the surface has been quantitatively analysed by X-ray fluorescence analysis; furthermore, the grain boundary frequency of secondary recrystallised grains in the direction perpendicular to rolling being 20 boundaries/100 mm or less; and moreover, the relationship t(Fo)/t(C) ≥ 0.3 being satisfied if t(Fo) is the average thickness of the forsterite base film and t(C) is the thickness of the insulating tension coating. |
