METHOD FOR PRODUCING GRAIN-ORIENTED MAGNETIC STEEL PLATE

摘要

The present invention provides a method of production of grain-oriented electrical steel sheet greatly reducing the Watt loss of the grain-oriented electrical steel sheet and making the magnetostriction as small as possible, that is, a method of production of grain-oriented electrical steel sheet with small magnetostriction by improving the magnetic properties by irradiation by a finely focused laser beam comprising using a power modulated laser controlled in maximum power density to 1 × 10 2 to 1 × 10 4 W/mm 2 to optimize the amount of strain given by laser irradiation in both the sheet width direction and rolling direction and, in particular, to make the modulation duty 70% to less than 100%.