Metal treatment – Compositions – Heat treating
Patent
1975-03-21
1976-09-28
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
75126H, 75126Q, 148121, 148142, C04B 3500, H01F 100
Patent
active
039829723
ABSTRACT:
The semihard magnetic alloy of the present invention consists essentially of, by weight, 17 to 45 % chromium, 3 to 14 % cobalt, 0.2 to 5 % silicon and balance substantially iron, preferably 23 to 35 % chromium, 6 to 12 % cobalt, 0.3 to 3 % silicon and balance substantially iron and has a residual magnetic flux density of 7,000 Gauss or more and a coersive force of 100 to 600 Oersted. Said alloy is produced by solution treating an alloy having the above indicated composition at a temperature of 650.degree.C. to 1,300.degree.C., preferably 850.degree.C. to 1,085.degree.C., and then either maintaining the solution-treated alloy at a temperature of not higher than 650.degree.C. for a given period of time and repeatedly aging said alloy in multi-stage at gradually lowered temperatures, or cooling the solution-treated alloy continuously from a temperature of not higher than 700.degree.C. down to at least 550.degree.C. at a rate of not higher than 50.degree.C. per hour.
REFERENCES:
patent: 1866925 (1932-07-01), Cioffi
patent: 3806336 (1974-04-01), Kaneko et al.
Bozorth, R; Ferromagnetism; New York, 1951, pp. 199-205 and 416.
Fujita Osamu
Ishijima Yoichi
Iwata Masao
Hitachi Metals Ltd.
Satterfield Walter R.
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