CPC C21D 8/0226 (2013.01) [C21D 8/0205 (2013.01); C21D 8/0236 (2013.01); C21D 2201/05 (2013.01)] | 6 Claims |
1. A magnetic domain refining method of a grain-oriented electrical steel sheet, comprising:
preparing a grain-oriented electrical steel sheet; and
forming a groove on one surface of the grain-orientation electrical steel sheet by irradiating a laser in a direction intersecting with a rolling direction,
wherein the forming of the groove includes forming a gradient section and forming a uniform section,
in the forming of the gradient section, a laser in which an average energy density is in the range of 0.05 to 0.5 J/mm2 is irradiated, and in the forming of the uniform section, a laser in which the average energy density is more than 0.5 J/mm2 to 5 J/mm2 is irradiated, and
lengths of the gradient section and the uniform section satisfy Equation 1 below:
0.1≤[GSL]/[USL]≤0.5 [equation 1]
wherein equation 1, [GSL] represents the length of the gradient section in μm and [USL] represents the length of the uniform section in mm.
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