Grain-oriented electrical steel sheet having improved glass film

Details Grain-oriented electrical steel sheet having improved glass film Grain-oriented electrical steel sheet having improved glass film

1986-12-05

1990-01-30

Sheehan, John P.

Metal treatment

Stock

Magnetic

148307, 148113, H01F 104

Patent

active

048971316

ABSTRACT:
The adhesiveness of a glass film and watt loss of a grain-oriented electrical steel sheet is improved by partially protruding the glass film into the steel sheet part thereof. To attain the partial protrusion, the steel sheet is subjected, prior or subsequent to decarburization annealing, to a treatment of the surface thereof to form unevenness, by a mechanical device, e.g., brush rolling, buff polishing, marking-off, sand papering, and grinding.

REFERENCES:
patent: 2234968 (1941-03-01), Hayes et al.
patent: 4213804 (1980-07-01), Datta
patent: 4363677 (1982-12-01), Ichiyama et al.
Patent Abstracts of Japan, vol. 6, No. 186, (C-126)(1064), Sep. 22, 1982 corresponding to Japan No. 57-101673 dated Jun. 24, 1982.
Patent Abstracts of Japan, vol. 10, No. 276 (C-373)(2332) Sep. 19, 1986 corresponding to Japan No. 61-96082 dated May 14, 1982.

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