CPC C21D 8/1283 (2013.01) [C21D 1/30 (2013.01); C21D 8/12 (2013.01); C21D 8/1222 (2013.01); C21D 8/1233 (2013.01); C21D 8/1255 (2013.01); C21D 8/1272 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01); C22C 38/60 (2013.01); C23C 22/22 (2013.01); C23C 22/74 (2013.01)] | 12 Claims |
1. A composition for forming an insulation coating film of an oriented electrical steel sheet, comprising:
a composite metal phosphate, a derivative thereof, or a mixture thereof, and
at least two colloidal silicas having different average particle diameters,
wherein a weight ratio of the colloidal silicas to the composite metal phosphate, the derivative thereof, or the mixture thereof (colloidal silicas/composite metal phosphate, a derivative thereof, or a mixture thereof) is 1.3 to 1.8.
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