Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1977-06-27
1978-11-28
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148 121, 148 3155, H01F 104
Patent
active
041274296
ABSTRACT:
A forsterite insulating film having a good adhesion property to a grain-oriented silicon steel sheet with a high magnetic induction is composed of forsterite grains having a mean grain size of not more than 0.7 .mu.m. The forsterite insulating film is formed by annealing a coil of a cold rolled silicon steel strip having a final gauge in an annealing furnace under an inert gas atmosphere at a constant temperature keeping stage of 800.degree.-920.degree. C so as to fully develop secondary recrystallized grains and then under hydrogen gas atmosphere at a temperature rising stage up to 1,150.degree.-1,250.degree. C and a constant temperature keeping stage of 1,150.degree.-1,250.degree. C during the final annealing, provided that an average dew point of the atmosphere is within a range of -20.degree. C to +20.degree. C in the temperature rising stage up to 1,150.degree.-1,250.degree. C and not more than +10.degree. C in the constant temperature keeping stage of 1,150.degree.-1,250.degree. C.
REFERENCES:
patent: 3116179 (1963-12-01), Carpenter et al.
patent: 3765957 (1973-10-01), Hamachi et al.
patent: 3823042 (1974-07-01), Bolling et al.
patent: 3940299 (1976-02-01), Goto et al.
patent: 3945862 (1976-03-01), Lee et al.
Ichida Toshio
Komatsubara Michiro
Dean R.
Kawasaki Steel Corporation
Sheehan John P.
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