Grain Oriented Electrical Steel Sheet

Abstract: The present invention further reduces iron loss in an obtained grain-oriented electrical steel sheet by controlling the shape of a linear groove formed for magnetic domain refinement and controlling the Sa values for the surface roughness of the bottom surface of the groove interior and the side surfaces of the groove interior to be within a fixed range. Provided is a grain-oriented electrical steel sheet comprising a steel sheet that contains, in mass%, 2.50-4.50% of Si and 0.01-0.15% of Mn, with the remainder comprising Fe and impurities, and that has a steel sheet surface in which linear grooves extending in a direction forming an angle of 0-30° relative to a direction orthogonal to the rolling direction are formed at intervals of 2-10 mm, wherein the depth D of the grooves is 10-40 µm, the width W of the grooves is 20-200 µm, the Sabottom value for the roughness of the bottom surface of the groove interior is 1.0-5.0 µm, and the Saside value for the roughness of the side surfaces of the groove interior is 1.0-5.0 µm.

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