ORIENTED ELECTROMAGNETIC STEEL PLATE AND PRODUCTION METHOD FOR SAME

摘要

The present invention can obtain an oriented electromagnetic steel plate with magnetic domain refinement by electron beam irradiation and which achieves excellent low-noise characteristics when assembled on an existing transformer, as a result of: the ratio (Wa/Wb) between a film thickness (Wa) of a fosterite coating on a distortion introduction side of a steel plate and a film thickness (Wb) of the fosterite coating on a distortion non-introduction side being 0.5 or greater; the average width of a discontinuous section in a magnetic domain in the steel plate surface on the distortion introduction side being 150-300 µm; and the average width of the discontinuous section in the magnetic domain in the steel plate surface on the distortion non-introduction side being 250-500 µm.