Process for producing ultrahigh silicon electrical thin steel sh

Details Process for producing ultrahigh silicon electrical thin steel sh Process for producing ultrahigh silicon electrical thin steel sh

1991-07-15

1997-03-25

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148112, H01F 104

Patent

active

056140347

ABSTRACT:
The present invention provides a thin sheet product having a combination of excellent magnetic properties inherent in the steel having a silicon content of 6.5% or near 6.5% with a further lowered iron loss property, particularly in a high frequency region, through the production of a magnetic thin steel sheet having a thickness of 0.23 mm or less by cold-rolling a steel sheet comprising by weight not more than that 0.006% of carbon, 5.0 to 7.1% of silicon, 0.07 to 0.30% of manganese, not more than 0.007% of sulfur, 0.006 to 0.038% of acid soluble aluminum and 8 to 30 ppm of total nitrogen with the balance consisting of iron and unavoidable impurities at a sheet temperature in the range of from 120.degree. to 350.degree. C. optionally after annealing the sheet at a temperature in the range of from 750.degree. to 1020.degree. C., and annealing the cold-rolled sheet at a temperature in the range of from 800.degree. to 1020.degree. C. for recrystallization and grain growth, to thereby prepare a magnetic steel sheet having a small thickness of 0.23 mm or less.

REFERENCES:
patent: 4773948 (1988-09-01), Nakaoka et al.
Patent Abstracts of Japan, vol. 12, No. 25, (M-718) [3098] Jul. 15, 1988 European Search Report EP 91 11 1772 (Feb. 17, 1988).
C. A. Clark: IEE. 113 (1966) p. 345.
K. Narita : IEE. Trans. Mag. MAG-14 (1978) p. 258.
H. Kimura : Bulletin of the Japan Institute of Metals, vol. 21, No. 10, p. 757 (1982).
NKK. Technical Report No. 125, p. 58 (1989).

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