Process for producing grain-oriented electric steel sheets havin

Details Process for producing grain-oriented electric steel sheets havin Process for producing grain-oriented electric steel sheets havin

1975-08-28

1976-08-24

Satterfield, Walter R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 27, 148 315, 427127, H01F 104

Patent

active

039765180

ABSTRACT:
Process for producing grain-oriented electric steel sheets having a remarkably improved magnetic flux density, comprising hot rolling silicon steel material containing 0.025 to 0.085% C, 2.0 to 4.0% Si, 0.010 to 0.065% acid soluble Al, continuously annealing the steel at a high temperature between 950.degree. and 1200.degree.C before a final strong cold rolling, rapidly cooling the steel to precipitate AlN, cold rolling the steel by a one-step or two-step cold rolling including a final strong cold rolling with a reduction rate range of 81 to 95% into the final thickness, coating a separating agent on the sheet after a decarburization annealing, and subjecting the sheet to a final annealing to obtain a grain-oriented electric steel sheet having excellent excitation characteristics and B.sub.8 characteristics of at least more than 1.90 Wb/m.sup.2, said separating agent containing 0.1 to 15% of antimony or an antimony-containing compound.

REFERENCES:
patent: 3671337 (1972-06-01), Kumai et al.
patent: 3697322 (1972-10-01), Lee et al.
patent: 3700506 (1972-10-01), Tanaka et al.
Saito, A; Effect of Minor Elements . . . in Silicon Steel, in Nippon Kinzoku, 27, 1963 pp. 191-195.

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