Abstract: A grain-oriented electrical steel sheet according to the present invention includes a silicon steel sheet as a base steel sheet, and when an average value of amplitudes in a wavelength range of 20 to 100 ?m among wavelength components obtained by performing Fourier analysis on a measured cross-sectional curve parallel to a sheet width direction of the silicon steel sheet is set as ave-AMPC100, ave-AMPC100 is 0.0001 to 0.050 ?m.

Abstract: A method for manufacturing a grain-oriented electrical steel sheet includes: heating a steel slab having a prescribed chemical composition to lower than 1250° C. and subjecting the steel slab to hot rolling to obtain a hot-rolled steel sheet; performing hot-band annealing on the hot-rolled steel sheet; pickling the hot-rolled steel sheet which has been subjected to the hot-band annealing; subjecting the hot-rolled steel sheet which has been subjected to the pickling to cold rolling to obtain a cold-rolled steel sheet having a final sheet thickness d of 0.15 to 0.23 mm; performing a decarburization nitriding treatment including decarburization annealing and nitriding on the cold-rolled steel sheet; performing final annealing on the cold-rolled steel sheet which has been subjected to the decarburization nitriding treatment; and then applying a coating liquid for insulation coating formation to the cold-rolled steel sheet which has been subjected to the final annealing and baking the cold-rolled steel sheet.

Abstract: A grain-oriented electrical steel sheet according to the present invention includes a silicon steel sheet as a base steel sheet, and when an average value of amplitudes in a wavelength range of 20 to 100 ?m among wavelength components obtained by performing Fourier analysis on a measured cross-sectional curve parallel to a sheet width direction of the silicon steel sheet is set as ave-AMPC100, ave-AMPC100 is 0.0001 to 0.050 ?m.

Abstract: A grain oriented electrical steel sheet includes: by mass %, 0.010% or less of C; 2.50 to 4.00% of Si; 0.0010 to 0.0100% of acid soluble Al; 0.012% or less of N; 1.00% or less of Mn; 0.02% or less of S; and a balance consisting of Fe and impurities, and has a tension-insulation coating at steel sheet surface and a SiO2 intermediate oxide film layer with an average thickness of 1.0 nm to 1.0 ?m at an interface between the tension-insulation coating and the steel sheet surface. In the grain oriented electrical steel, a time differential curve fM(t) of a glow discharge optical emission spectrum of a metallic element M (Al) in the SiO2 intermediate oxide film layer satisfies a predetermined condition.