| 摘要 |
PURPOSE:To obtain the titled steel sheet without the loss in the effect of improving an iron loss by removing the surface film of a grain oriented electrical steel sheet subjected to finish annealing, electroplating intrusive bodies thereon under specific conditions and forming the intruding bodies at intervals on the steel sheet thereby attaining the finer segmentation of magnetic domains. CONSTITUTION:The surface film such as glass film, insulating film or oxide film of the grain oriented electrical steel sheet subjected to the finish annealing is removed at intervals or over the entire surface to expose the base metal of the steel sheet. The intervals thereof are made about 1-30mm, the removing width is made about 0.01-5mm and the removing direction is made about 30-90 deg. with respect to the rolling direction in the case of removing the surface film at intervals. The intrusive bodies are then electroplated on such steel sheet within 1g/cm<2> coating weight by a fluoric bath or hydrofluoric bath to form the intruding bodies at intervals and to attain the finer segmentation of magnetic domain. Metals such as Sb, Cu, Sn, Zn, Fe, Ni, Cr, Mn, Mo and Co and the alloys thereof are used for the intrusive bodies. The titled electrical steel sheet which does not lose the effect of improving the iron loss even if subjected to strain relief annealing by heating to a high temp. is thus produced. |
