Treatment solution for insulation coating for grain oriented electrical steel sheet and method for producing grain oriented electrical steel sheet having insulation coating
AssigneeJfe Steel Corporation
InventorsMinoru Takashima, Mineo Muraki, Makoto Watanabe, Tomofumi Shigekuni
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Abstract
A treatment solution for insulation coating for grain oriented electrical steel sheet includes at least one member selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, and colloidal silica in a proportion of 0.2 to 10 mol in terms of SiO2 and a titanium chelate compound in a proportion of 0.01 to 4.0 mol in terms of Ti, relative to PO4: 1 mol in the phosphates.
Claims9
A treatment solution for insulation coating for grain oriented electrical steel sheet, comprising:
- at least one member selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn;
- and
- colloidal silica in a proportion of 0.2 to 10 mol in terms of SiO2 and a titanium chelate compound in a proportion of 0.01 to 4.0 mol in terms of Ti, relative to PO4:1 mol in the phosphates.
A method for producing a grain oriented electrical steel sheet having an insulation coating, comprising a series of steps of:
- forming a slab for grain oriented electrical steel sheet into a sheet having a final sheet thickness by rolling,
- subjecting the sheet to primary recrystallization annealing,
- subjecting the sheet to secondary recrystallization annealing,
- applying a treatment solution for insulation coating to the sheet, and
- baking the sheet,
- wherein the treatment solution for insulation coating contains at least one member selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, colloidal silica in a proportion of 0.2 to 10 mol in terms of SiO2 relative to PO4:1 mol in the phosphates being used, and a titanium chelate compound in a proportion of 0.01 to 4.0 mol in terms of Ti, relative to PO4:1 mol in the phosphates being used, and
- the baking step being performed at a temperature of 350° C. or higher and 1100° C. or lower.
Dependencies are inferred from the claim text.