Patent ID: 6635125
Filing Date: 2003-10-21
Classification: C21D,C23C,H01F

Abstract:
A grain-oriented electrical steel sheet which has excellent film characteristics and magnetic characteristics,comprising up to 0.005% of C, 2.0 to 7.0% of Si in terms of weight % and the balance Fe and unavoidable impurities, having an oxide film which mainly contains forsterite and is formed on the surface, and an insulating coating formed on the oxide film, wherein the amount of the oxide film is from 1 to 4 g/m2 per side, and the depth of the peak position of Si from the oxide film surface, obtained by glow discharge spectral analysis (GDS analysis) is up to {fraction (1/10)} of the depth of that of Al, and showing a ratio y (%) with which peeling of the oxide film does not take place when subjected to a bending test with a curvature of 20 mm and which satisfies the following formula (1): y(%)&gE;âˆ’122.45t+112.55â€ƒâ€ƒ(1) wherein t represents a sheet thickness in terms of mm, and iron loss characteristics W (W/kg) which satisfy the following formula (2):W (W/kg)&lE;2.37t+0.280â€ƒâ€ƒ(2) wherein t represents a sheet thickness in terms of mm.