GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR

摘要

A grain-oriented electrical steel sheet according to the present invention has a film on a surface thereof and a thickness of t (mm). No rust is produced on a surface of the steel sheet after a humidity cabinet test lasting 48 hours at a temperature of 50 °C in an atmosphere of 98 % humidity, and iron loss W 17/50 after electron beam irradiation is reduced by at least (-500t 2 + 200t-6.5) % of the iron loss W 17/50 before the electron beam irradiation and is (5t 2 -2t + 1.065) W/kg or less. As a result, it is possible to achieve a grain-oriented electrical steel sheet suitable for use as an iron core of a transformer or the like and having low iron loss without deterioration of corrosion resistance.