| 摘要 |
PURPOSE:To obtain a unidirectional electromagnetic steel plate with excellent iron loss in the right- angled direction to rolling, having a linear fine strain in almost parallel with the direction of rolling on the surface of a steel plate already subjected to a finish annealing treatment. CONSTITUTION:A unidirectional electromagnetic steel plate with improved iron loss in the right- angled direction to rolling is obtained by introducing a linear small strain in almost parallel with the direction of rolling on the surface of a unidirectional electromagnetic steel plate already subjected to a finish annealing treatment for secondary crystallization by a method of lessening surface defects without using blade tip, etc., in which a line drawing is made by turning an approx. 1mm.-diameter spherical rotator, for example, in contact with the surface of a steel plate while applying a load on it. The small strain-introducing process may be applied in any process after the completion of the secondary crystallization, or after the formation of insulating film for raising its insulating property. Also, in order to raise the insulating property after the strain-introducing process, the application of a coat of a phosphorus-containing compound, an organic compound, or an ultraviolet rays-curable resin is recommendable. |
