Process for manufacturing silicon-aluminum steel sheet with orie

Details Process for manufacturing silicon-aluminum steel sheet with orie Process for manufacturing silicon-aluminum steel sheet with orie

1974-07-23

1976-05-25

Satterfield, Walter R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 3155, 148111, H01F 104

Patent

active

039590330

ABSTRACT:
Low carbon silicon-aluminum single-oriented steel sheet having high magnetic induction is produced by hot rolling at 1370.degree.-1430.degree.C., annealing from 10 to 60 seconds at 1050 to 1170.degree.C., slow cooling to 700.degree.-900.degree.C., quenching from 700.degree.-900.degree.C., cold rolling with a reduction in thickness of 80 to 90%, recrystallization and decarburization annealing in wet hydrogen from 780.degree. to 870.degree.C. for 2 minutes, and final annealing at 1200.degree.C. in a mixture of 10-50% hydrogen and 50-90% nitrogen. Cold rolling can be effected in two stages, the first stage to reduce the thickness by 20 to 50% followed by annealing at 700.degree. to 900.degree.C., quenching and final cold rolling with a reduction in thickness of 80 to 90%. The preferred temperature range prior to quenching, for one-step cold rolling, is 750.degree. to 850.degree.C.; and for two-step cold rolling, the first quench is preferably from a temperature of 750.degree. to 850.degree. C. and the second quench preferably from a temperature of 850.degree. to 900.degree.C.

REFERENCES:
patent: 1752490 (1930-04-01), Karcher
patent: 3151005 (1964-09-01), Alworth et al.
patent: 3287183 (1966-11-01), Taguchi et al.
patent: 3632456 (1972-01-01), Sakakura et al.
patent: 3636579 (1972-01-01), Sakakura et al.
patent: 3671337 (1972-06-01), Kumai et al.
patent: 3846187 (1974-11-01), Sakakura et al.

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