INSULATING FILM EXCELLENT IN TENSION-IMPARTING PROPERTY, GRAIN-ORIENTED MAGNETIC STEEL SHEET WITH LOW IRON LOSS AND ITS PRODUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide an insulating film wherein film characteristics such as adhesiveness and a tension-imparting property are improved by improving properties of the insulating film formed on the surface of a steel sheet in the final step of a production method of the grain-oriented magnetic steel sheet, the grain-oriented magnetic steel sheet having the insulating film and its production method.

SOLUTION: The insulating film excellent in tension-imparting property comprises colloidal silica covered with a metal phosphate (preferably aluminum phosphate) and a phosphate as essential components and, preferably, further comprises a chromate or boric acid as components other than the essential components.

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