Patent ID: 8734658
Filing Date: 2014-05-27
Classification: C21D,C22C,C23F,C25F,H01F

Abstract:
1. A method for manufacturing a grain-oriented electrical steel sheet comprising the steps of: forming a film on one surface or both surfaces of a steel sheet; and performing etching on the steel sheet where the film is formed such that a groove depth of the steel sheet is 10 μm to 30 μm, and an erosion length of the steel sheet under the film is 2 to 4.5 times of the groove depth, wherein a steel sheet exposed portion where a portion of the steel sheet is exposed is formed in the film, and the steel sheet exposed portion has a first region oriented in a sheet width direction, and a plurality of second regions starting from the first region, widths of the first region and the second regions being 20 μm to 100 μm, and a distance from an end portion of one of the second regions to an end portion of another of the second regions adjacent thereto being 60 μm to 570 μm.