Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1982-05-25
1989-02-21
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148112, H01E 104
Patent
active
048061760
ABSTRACT:
The present invention relates to an improvement in the precipitation annealing of a hot-rolled steel sheet or strip which is carried out immediately before cold-rolling in the production of a grain-oriented electromagnetic steel sheet or strip. Conventionally, precipitation annealing is carried out by heating a steel strip to a temperature of from 750.degree. to 1200.degree. C. and then quenching it. The present invention proposes to control the cooling rate during primary cooling, i.e. from a holding temperature (T.sub.1 temperature) of from 1080.degree. to 1200.degree. C. down to an intermediate temperature (T.sub.2 temperature) of from 900.degree. to 980.degree. C., and to control the staying time during primary cooling so that excellent magnetic properties can be obtained regardless of the unavoidable variation in the Al and Si content. The present invention also proposes to control the rate of temperature elevation between 800.degree. C. and the holding temperature as to obtain AlN particles having an optimum size.
REFERENCES:
patent: 3636579 (1972-01-01), Sakakura et al.
patent: 3933024 (1976-01-01), Matsumoto et al.
patent: 3959033 (1976-05-01), Barisoni et al.
patent: 4123298 (1978-10-01), Kohler et al.
patent: 4319936 (1982-03-01), Dahlstrom et al.
Harase Jiro
Kuroki Katsuro
Nakashima Shozaburo
Wada Toshiya
Nippon Steel Corporation
Sheehan John P.
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