| 摘要 |
PURPOSE:To remarkably reduce the iron loss of a silicon steel sheet, by radiating a plasma flame in a specific direction at the time of reducing iron loss by radiating a plasma flame to the surface of a grain-oriented silicon steel sheet for use in a transformer, etc. CONSTITUTION:A silicon steel sheet used as an iron core for a transformer and other electric apparatus is finish-annealed and then subjected to insulation coating, to which a plasma flame is radiated in a direction perpendicular to the rolling direction by using an Ar gas. At this time, the plasma flame is radiated at intervals of (l)mm represented by 22-2.5D<=l;<=36-2.5D when the average secondary recrystallized grain size of the silicon steel sheet is Dmm. By the above plasma flame radiation treatment, the iron loss of the silicon steel sheet is drastically reduced, and electric energy loss in a transformer, etc., prepared by using this steel sheet can be reduced.
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