Method for manufacturing cold rolled, non-directional electrical

Details Method for manufacturing cold rolled, non-directional electrical Method for manufacturing cold rolled, non-directional electrical

1974-06-21

1976-04-06

Satterfield, Walter R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 3155, 148111, H01F 104

Patent

active

039486915

ABSTRACT:
A method for manufacturing cold rolled, nondirectional electrical steel sheets and strips having a high magnetic flux density wherein a molten steel is solidified to obtain a slab in a manner that columnar grains develop predominantly from the surface in the direction of thickness of the slab up to a depth of more than 50%; said slab is heated to a temperature above 1000.degree.C without cogging and rolling to form .gamma.-phase at least more than about 10% of said slab, and hot rolled strongly with a draft of more than 98% without reheating to obtain a hot rolled steel sheet; and said hot rolled steel sheet is cold rolled with a draft of 64 - 84%, heated with a heating velocity of more than 1.6.degree.C/sec., and annealed at a temperature of 600.degree. - 1200.degree.C.

REFERENCES:
patent: 2193768 (1940-03-01), Masumoto et al.
patent: 3061486 (1962-10-01), Jackson
patent: 3159511 (1964-12-01), Taguchi et al.
patent: 3164496 (1965-01-01), Hibbard et al.
patent: 3203839 (1965-08-01), Takahashi
patent: 3620856 (1971-11-01), Hiraoka
patent: 3671337 (1972-06-01), Kumai et al.
patent: 3764406 (1973-10-01), Littmann
Sachs, G., et al.; Practical Metallurgy, Practical Metallurgy, Cleveland (ASM) 1940 pp. 24-33.
Barrett, C., et al.; Structure of Metals, New York, 1966 pp. 535-536.

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