Grain Oriented Electrical Steel Sheet

Abstract: The present invention further reduces iron loss of an obtained grain-oriented electrical steel sheet by controlling the shape of grooves to be within a predetermined range in order to subdivide a magnetic domain. This grain-oriented electrical steel sheet comprises a steel sheet that has a steel sheet surface having formed therein grooves which extend in a direction intersecting the rolling direction and in which the groove depth direction is the sheet thickness direction. When the steel sheet surface is viewed in the thickness direction, the grain-oriented electrical steel sheet has groove groups each formed of a plurality of said grooves arranged in the sheet width direction, and the groove groups are arranged apart from each other in the rolling direction. In at least 75% of the groove groups, the average width of the grooves forming the groove groups is 42-62 µm. The grooves forming said groove groups are arranged so as to, in a projection plane in which the groove depth direction is parallel to the direction in which the grooves extend, overlap grooves adjacent thereto. In the projection plane, the size of overlap between a first groove and a second groove is 5-30 mm, and the size of undulation of edges of the grooves forming the groove groups is 0.5-5.0 µm.

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