Grain oriented electrical steel sheet with low iron loss and production method for same

摘要: A grain oriented electrical steel sheet comprises metal part containing Si: about 2.5 to about 5.0 mass% and Cr: 0.05 1.0 mass%, an insulation coating formed on a surface of the part. tension imparted in the rolling direction by insulation coating is not smaller than 3.0 MPa. Magnetic flux density B 8 satisfies specific relation formula. plurality linear strains or grooves are in linearly extended at an angle larger 45° (in each direction) relative direction perpendicular such that interval D linear strains or grooves formula depending Cr content. grain oriented thereby obtained which has lower iron loss after domain refining treatment conventional values. In production process for steel sheet invention, parameters as annealing temperature before final cold controlled.