GRAIN-ORIENTED ELECTRICAL STEEL SHEET

摘要

The present invention proposes a method that can reduce the noise generated by a transformer core and the like when formed by laminations of a grain-oriented electrical steel sheet in which core loss has been reduced by a magnetic domain refinement process. In this steel sheet, linear distortion extending with an orientation in which an angle formed with a direction perpendicular to the rolling direction of the steel sheet is an angle of 30° or less is periodic in the direction of rolling of the steel sheet, core loss (W17/50) is 0.720 W/kg or less, and magnetic flux density (B8) is 1.930 T. The volume of the closure domain arising in the distortion part is 1.00-3.00% of the total magnetic domain volume within the steel sheet.

主权项

1. A grain-oriented electrical steel sheet with an excellent noise property, comprising linear strain in a rolling direction of the steel sheet periodically, the linear strain extending in a direction that forms an angle of 30° or less with a direction orthogonal to the rolling direction of the steel sheet, iron loss W17/50 being 0.720 W/kg or less, a magnetic flux density B8 being 1.930 T or more, and a volume occupied by a closure domain occurring in the strain portion being 1.00% or more and 3.00% or less of a total magnetic domain volume in the steel sheet.