| 摘要 |
An object of the present invention is to provide a grain oriented electrical steel sheet having reduced iron loss by carrying out magnetic domain refinement free of the iron-loss deteriorating factors. Specifically, the present invention provides a grain oriented electrical steel sheet, comprising: forsterite film on a surface of base steel sheet and a selenium-concentrated portion in at least one of the forsterite film and an interface between the forsterite film and the base steel sheet by presence ratio expressed as area-occupying ratio of the Se-concentrated portion, of at least 2%, per 10000 µm 2 of the surface of the base steel sheet, which has been subjected to magnetic domain refinement treatment by means of electron beam irradiation. |
