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AssigneeKawasaki Steel Corporation
InventorsHiroshi Shimanaka, Toshio Ichida, Shigeru Kobayashi
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An insulating coating having a high adhesion on an oriented silicon steel sheet, which applies a tension on the surface of the steel sheet and restrains magnetostriction increased when compressive stress is subjected to said oriented silicon steel sheet, is formed by applying a coating aqueous dispersion of 7 - 24% by weight of colloidal silica and 5 - 30% by weight of magnesium phosphate in monobasic magnesium phosphate on the oriented silicon steel sheet and baking the thus treated steel sheet at a temperature of 350.degree. - 900.degree.C. Said coating is more improved by adding 0.01 - 5% by weight of at least one of chromic anhydride, chromates and bichromates to said coating aqueous dispersion.
A method for forming an insulating coating on an oriented steel sheet having a forsterite coating on its surface, said method comprising;
A coating aqueous dispersion for improving the compression stress property of the magnetostriction of an oriented silicon steel sheet consisting essentially of 7-24% by weight of colloidal silica and 5-30% by weight of magnesium phosphate as magnesium primary phosphate, the remainder being water.
Dependencies are inferred from the claim text.