Process for production of double-oriented electrical steel sheet

Details Process for production of double-oriented electrical steel sheet Process for production of double-oriented electrical steel sheet

1988-11-28

1991-03-05

Andrews, Melvyn J.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

H01F 1047

Patent

active

049974939

ABSTRACT:
In the conventional process for the production of a double-oriented electrical steel sheet, the preparation steps are complicated and the manufacturing cost is very high. Nevertheless, the magnetization characteristic B.sub.10 is lower than 1.85 Tesla and the final sheet thickness cannot be reduced below 0.30 mm. According to the present invention, by strictly controlling the secondary recrystallization temperature and performing a third cold rolling in the same direction as the rolling direction of the first cold rolling, the magnetization characteristic B.sub.10 can be increased above 1.88 Tesla and the final sheet thickness can be reduced to 0.20 mm. Moreover, a double-oriented electrical steel sheet having an excellent shape (flatness) and a much smaller thickness deviation in the longitudinal direction of the product can be produced on an industrial scale. Therefore, this product can be effectively used as a core material of a large-size rotary machine or in a small-size static magneto-electronic device.

REFERENCES:
patent: 1965559 (1934-07-01), Goss
patent: 3130095 (1964-04-01), Kohler et al.
patent: 3136666 (1964-06-01), Taguchi et al.
patent: 3159511 (1964-12-01), Taguchi et al.
patent: 3163564 (1964-12-01), Taguchi et al.
patent: 3640780 (1972-02-01), Stanley
patent: 3932234 (1976-01-01), Imanaka et al.

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