Directional electromagnetic steel sheet, manufacturing method of directional electromagnetic steel sheet, coiled core and laminated core

Abstract

[Problem] To provide a directional electromagnetic steel sheet, a method for manufacturing the directional electromagnetic steel sheet, and a low-iron-loss coiled core; the directional electromagnetic steel sheet can be appropriately controlled to control the magnetic flux flow between adjacent steel sheets in the thickness direction after lamination. [Solution] The directional electromagnetic steel sheet of the present invention is an electromagnetic steel sheet, which, in a cross section orthogonal to the surface of the steel sheet, has a 200µm wide region in a specific direction parallel to the surface of the steel sheet, including: tensile strain regions 13 and 14 with tensile strain in the aforementioned specific direction, and a plurality of compressive strain regions 12 with compressive strain in the aforementioned specific direction; and if the shortest distance from the point of maximum strain in the largest compressive strain region to the nearest steel sheet surface is LO, and the average of the shortest distances from the points of maximum strain in the two sequentially largest tensile strain regions to the steel sheet surface is LA(n), then the following equation (1) is satisfied: 1.00<LO / LA(n)<16.00 ・・・(1).

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