Process for preparation of oriented electrical steel sheet havin

Details Process for preparation of oriented electrical steel sheet havin Process for preparation of oriented electrical steel sheet havin

1994-01-21

1999-03-30

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148111, H01F 104

Patent

active

058883142

ABSTRACT:
In a process for the preparation of oriented electrical steel sheet having a high magnetic flux density a primary recrystallization annealed steel sheet is nitrided for a short period of time in a temperature range of 800.degree. C. or less whereby growth of crystal grains does not substantially occur. The nitrided sheet is held at a temperature range of 700.degree. C. to 800.degree. C. for at least four hours during temperature raising to final annealing temperature whereby nitride formed by the nitriding dissolves and re-precipitates allowing the nitride to transform to a thermally stable nitride containing aluminium.

REFERENCES:
patent: 4929286 (1990-05-01), Komatsu et al.
patent: 5049205 (1991-09-01), Takahashi et al.
patent: 5082509 (1992-01-01), Ushigami et al.
J.E. May. D. Turnbull (Trans. Met. Soc. AIME 212 (1958) pp. 769/781).
Trans. of Japanese Metal Association, vol. 27 (1963) pp. 186/195.
Iron & Steel, vol. 53 (1967) pp. 1007/1023.
Trans. of Japan Metal Association, vol. 43 (1979). pp. 175/181.

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