| 摘要 |
The present invention provides a grain-oriented electrical steel sheet with an extremely low core loss by scanning by a small focused laser beam spot and a method of production of the same, that is, a grain-oriented electrical steel sheet improved in electrical characteristics by scanning by a continuous wave fiber laser of the TEM00 mode with a wavelength lambda of 1.07≤ lambda ≤2.10 mu m substantially perpendicular to the steel sheet rolling direction and at substantially constant spacing and a method of production of the same, wherein a rolling direction focused spot diameter d (mm) of the irradiated beam, a linear scan rate V (mm/s) of the laser beam, an average output P (W) of the laser, a width of the formed laser scribing traces or with of the electrical domains Wl (mm), and a rolling direction Pl (mm) of the laser scribing traces are in the following ranges: <DF>0<d≤0.20 </DF> <DF>0.001≤P/V≤0.012 </DF> <DF>0<Wl≤0.20 </DF> <DF>1.5≤Pl≤11.0 </DF> <IMAGE> |
