| 摘要 |
The present invention provides a low core loss grain-oriented electrical steel sheet that does not suffer deterioration in magnetic flux density and the lowering of a space factor and can withstand stress-relieving annealing, wherein: melted and re-solidified layers are formed on either or both of the surfaces of the grain-oriented electrical steel sheet in the manner of extending in the direction perpendicular to the rolling direction, namely in the direction of the width thereof, at a cyclic interval of not less than 2 mm to less than 5 mm in the rolling direction; the melted and re-solidified layers on each surface of the grain-oriented electrical steel sheet have an aspect ratio, the aspect ratio being the ratio of the depth to the width of a melted and re-solidified layer, of not less than 0.20 and a depth of not less than 15 mu m; and further the melted and re-solidified layers are formed by using a laser. <IMAGE> |
