POSCO Holdings Inc.
Grain-oriented electrical steel sheet and method for manufacturing same

Abstract:

Disclosed are a grain-oriented electrical steel sheet and a method of manufacturing the same. The method for manufacturing a grain-orientated electrical steel sheet according to an exemplary embodiment of the present invention includes: providing an electrical steel sheet before forming primary recrystallization or after forming the primary recrystallization; and forming a groove in a surface of the electrical steel sheet by radiating laser and simultaneously spraying gas onto the electrical steel sheet, in which energy density E.sub.d and a laser scanning speed V.sub.s of the radiated laser satisfy the following conditions, 1.0 J/mm.sup.2.ltoreq.E.sub.d.ltoreq.5.0 J/mm.sup.2, 0.0518 mm/.mu.sec.ltoreq.V.sub.s.ltoreq.0.2 mm/.mu.sec.