Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1981-05-15
1983-08-02
Stallard, W.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
75124, 75128D, 75128W, 148 35, C22C 3706, C22C 3708, C22C 3710, C21D 938
Patent
active
043964427
ABSTRACT:
The present invention relates to a ductile cast iron roll which is excellent in its resistance breaking and which has the chemical composition comprising 3.0-3.8% C, 1.5-2.5% Si, 0.2-1.0% Mn, 0.01-0.2% P, less than 0.06% S, 0.7-3.0% Ni, 0.1-0.6% Cr, 0.1-0.8% Mo, 0.02-0.1% Mg, balance iron and unavoidable impurities and the base structure having a fine two-phase structure of ferrite mingled with pearlite.
The cast iron roll is manufactured by holding the said cast iron roll at the temperature 780.degree..about.850.degree. C. for less than 20 hours; and after that by cooling the same down to 760.degree. C. at the cooling speed 50.about.300.degree. C./Hr; and after that by holding the same at the temperature 450.degree..about.650.degree. C. for less than 20 hours.
REFERENCES:
patent: 1391215 (1921-09-01), Speer
patent: 2804414 (1957-08-01), Moss et al.
patent: 3273998 (1966-09-01), Knoth et al.
patent: 4124413 (1978-11-01), Komatsu et al.
Separate-Volume of Supplement of "METAL", Jun. 15, 1963, pp. 6-8, Activity of Tough Cast Iron by Tetsuo Takenaka.
Fukuda Masahiro
Nakamura Shiro
Okabayashi Akitoshi
Kubota Ltd.
Stallard W.
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