GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET HAVING SUPERIOR MAGNETIC PROPERTY, AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a grain-oriented electromagnetic steel sheet which has a low iron loss at a high magnetic flux density, and to further provide the grain-oriented electromagnetic steel sheet having low magnetostriction as well.;SOLUTION: The grain-oriented electromagnetic steel sheet after having been irradiated with a laser beam to reduce the iron loss shows a magnetic flux density B8 of 1.92 T or higher when a magnetizing force of 800 A/m is applied to the steel sheet, and has crystals that include both of the region in which the absolute value of an angle β is 0° and the region in which the absolute value of an angle β is 2°in the same crystal grain, so as to occupy 30% or more in the total area of the steel sheet by an area rate. The steel sheet also includes the region in which the absolute value of the angle β is 2°or higher, in the crystal grain, so as to occupy 20% to 70% in the crystal grain area by the area rate. The steel sheet also has a mark which has been formed by irradiation with the laser beam on the surface or a circulating current magnetic domain which has been formed in a laser-irradiated part, controlled to have a width of 10 μm to 200 μm in a rolling direction.;COPYRIGHT: (C)2006,JPO&NCIPI