Metal treatment – Compositions – Heat treating
Patent
1989-12-04
1991-11-12
Dean, H.
Metal treatment
Compositions
Heat treating
148321, 148 155, 148141, 148144, 420902, C21D 804
Patent
active
050644785
ABSTRACT:
A method for producing a selectively surface hardened cast iron part includes uniformly heating the surface of the part by immersion into a molten metallic bath until a desired thickness of surface austenite is produced, and thereafter quenching the heated cast iron part in a liquid quenching bath which is maintained at a temperature of between about 450.degree. to about 800.degree. F. for about 10 minutes to about 4 hours. The resultant selectively surface hardened cast iron part is surface hardened with the bulk of the body of the part remaining untempered. An apparatus for performing this process includes a molten metal bath chamber for containing the molten metal and a molten salt bath quenching chamber for quenching the cast iron parts with a conveyor means extending between the molten metal bath and the molten salt bath chambers. A second conveyor means removes the parts from the molten salt bath chamber.
REFERENCES:
patent: 4596606 (1986-06-01), Kovacs et al.
W. Paul Eddy, Jr., "Liquid Baths for Heat Treating-Oil and Lead", The Iron Age, Sep. 1, 1932, pp. 323, 20.
W. Paul Eddy, Jr., "Liquid Baths for Heat Treating--Low Temperature Salt Baths", The Iron Age, Oct. 20, 1932, p. 613.
Keough John R.
Kovacs Bela V.
Pramstaller Douglas M.
Applied Process
Cargill Lynn E.
Dean H.
Ip Sikyin
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