| abstract |
This grain-oriented electrical steel sheet contains, in mass%, C: 0.010% or less, Si: 2.50 to 4.00%, Mn: 0.050 to 1.000%, S+Se: 0.005% or less in total, Sol.Al: 0.005% or less, N: 0.005% or less, Bi+Te+Pb: 0 to 0.0300% in total, Sb: 0 to 0.50%, Sn: 0 to 0.50%, Cr: 0 to 0.50%, Cu: 0 to 1.0%, the remainder being A base steel sheet having a chemical composition composed of Fe and impurities, and a tension imparting insulating film provided on a surface of the base steel sheet, the surface of the base steel sheet in a direction perpendicular to the rolling direction in a rolling 90° direction has an arithmetic mean roughness (Ra) of 0.60 µm or less, and when the cross section of the base steel sheet is observed along the rolling 90° direction, there are 1.0 concave portions with a depth of 0.1 μm or more and 2.0 μm or less on the surface of the base steel sheet /100 µm or more and 6.0 pieces/100 µm or less. |