| 摘要 |
This oriented electromagnetic steel sheet is provided with a steel sheet having a surface which has, formed therein, grooves which extend in a direction intersecting the rolling direction, and which have a depth direction that becomes the sheet thickness direction. When the groove average depth D is defined as the average value of the depths of the grooves in the sheet thickness direction at central sections of the grooves in the groove longitudinal direction, a groove-end straight line is defined as a straight line linking a first point in a groove inclined section at which the groove depth in the sheet thickness direction is 0.05×D, and a second point at which the groove depth is 0.50×D, a first angle θ is defined as the angle formed between the surface of the steel sheet and the groove-end straight line, and the average groove width W is defined as the average value of the lengths of the grooves in the width direction, i.e. the lengths of line segments each linking two points in the groove outline appearing in a cross section of the groove in the width direction, said two points being where the groove depth in the sheet thickness direction is 0.05×D, the aspect ratio A obtained by dividing the groove average depth D by the average groove width W, and the first angle θ satisfy formula (1), namely θ<-21×A+77. |
