LAMIERA DI ACCIAIO ELETTRICO A GRANA ORIENTATA AVENTE UNA BASSA PERDITA DI POTENZA E METODO PER LASUA FABBRICAZIONE

摘要

Method for subdividing the magnetic domains of a grain-oriented electrical steel sheet is improved so that the watt loss can be further lessened and the watt-loss improving effect does not disappear during stress relief annealing. An intrudable means is formed on the finishing-annealed steel sheet on or in the vicinity of strain which promotes the intrusion of an intrudable means. Sb or Sb containing material is a preferred intrudable means and the laser irradiation is a preferred method for imparting the strain and also for attaining the removal of a surface coating.