Grain Oriented Electrical Steel Sheet And Method For Forming Insulating Film

Abstract: This grain-oriented electrical steel sheet has a base steel sheet and an insulating film formed on a surface of the base steel sheet. The base steel sheet has, on the insulating film side, an iron-based oxide layer containing an iron-based oxide. The insulating film has: an intermediate layer that is formed on the base steel sheet side and that contains a crystalline metal phosphate; and a tensile film layer formed on the surface side of the insulating film. The average thickness of the iron-based oxide layer is 0.10-1.50 µm, the average thickness of the intermediate layer is 0.3-10.0 µm, and the average thickness of the insulating film is 2.0-10.0 µm. The crystalline metal phosphate in the intermediate layer is one or two among zinc phosphate, manganese phosphate, iron phosphate, and zinc phosphate calcium. The tensile film layer contains a metal phosphate and silica. The contained amount of the silica in the tensile film layer is 20-60 mass%.

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