Grain-oriented electrical steel sheet and method of production of same

Abstract

The present invention has as its object to provide grain-oriented electrical steel sheet better improved in core loss in control of magnetic domains for forming laser grooves in cold rolled steel sheet. The present invention provides grain-oriented electrical steel sheet meeting the following requirements for achieving the object: That is, it provides grain-oriented electrical steel sheet comprising a base material steel sheet having a plurality of grooves on the surface of the steel sheet and a glass coating on the surface of the base material steel sheet, in which grain-oriented electrical steel sheet, an absolute value of an angle θ formed by a direction perpendicular to a rolling direction and a sheet thickness direction of the base material steel sheet and a longitudinal direction of the grooves is 0 to 40°, a width W of the grooves is 20 μm to 300 μm, a depth D of the grooves is 10 μm to 40 μm, and a pitch P of the grooves in the rolling direction is 1.0 mm to 30 mm, and, when a thickness of the glass coating at flat parts of the surface of the base material steel sheet is t1, a glass coating thickness of deepest parts of the grooves in the recessed parts of the grooves is t2, and a glass coating thickness of side parts of the grooves is t3, the relationship of formula (1) is satisfied: (t2+t3)/2≥t1  formula (1)

Dependencies are inferred from the claim text.