GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING SAME

摘要

Disclosed is a grain-oriented electrical steel sheet exhibiting low hysteresis loss and low coercive force, in which an increase in hysteresis loss due to laser irradiation or electron beam irradiation, which has been a conventional concern, is effectively inhibited. The grain-oriented electrical steel sheet has closure domain regions (X) formed to divide the magnetic domains in a rolling direction, from one end to the other in the width direction of the steel sheet, provided that Expression (1) is satisfied:;−(500t−80)×s+230≦w≦−(500t−80)×s+330  Expression (1),;where t represents a sheet thickness (mm); w represents a smaller one of the widths (μm) of the regions measured on the front and rear surfaces of the steel sheet, respectively, by using a Bitter method; and s represents an average number of the regions present within one crystal grain.

主权项

1. A grain-oriented electrical steel sheet comprising closure domain regions X formed to divide magnetic domains of the steel sheet in a rolling direction, from one end to the other in the width direction of the steel sheet, in a linear or curved manner, and periodically in the rolling direction, provided that Expression (1) is satisfied:
−(500t−80)×s+230≦w≦−(500t−80)×s+330  Expression (1),where t represents a sheet thickness in millimeters; w represents a smaller one of the widths in micrometers of the regions X measured on front and rear surfaces of the steel sheet, respectively, by using a Bitter method; and s represents an average number of the regions X present within one crystal grain.