Patent ID: 8034196

Claim:
A grain-oriented electrical steel plate comprising: a steel plate having a front surface and a rear surface, wherein at least one of the front surface and the rear surface has grooves having a width of 10 μm to 200 μm and a depth of 10 μm to 30 μm at intervals of 1 mm to 10 mm, the grain-oriented electrical steel plate is obtained by rolling the steel plate so that an angle between a direction in which the grooves extend and a rolling direction of the steel plate is 60 degrees to 120 degrees, and wherein differing tensile stresses arc generated in the steel plate, wherein the portion(s) having the maximum tensile stress are located within 10 μm to 300 μm from side surfaces of the grooves and have a value of 20 MPa to 300 MPa.