Grain Oriented Electromagnetic Steel Sheet And Method For Forming Insulating Coating

Abstract: This grain-oriented electromagnetic steel sheet comprises a base material steel sheet and an insulating coating formed on the surface of the base material steel sheet. The base material steel sheet comprises a flat section and a groove section that extends in a direction at a 45–135° angle to a rolling direction; the depth of the groove section is 10–30 µm; and the width of the groove section is 10–200 µm. The insulating coating comprises: an intermediate layer that is formed on the base material steel sheet side, that includes a crystalline metal phosphate and that has a thickness of 0.1–15.0 µm; and a tensile coating layer that is formed on the surface side of the insulating coating. For at least 50% of the groove section, by area ratio, the base material steel sheet is covered by the insulating coating which includes the tensile coating layer and the intermediate layer that has a thickness of 0.1–9.0 µm.

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