Method of carburizing spheroidizing and quenching

Details Method of carburizing spheroidizing and quenching Method of carburizing spheroidizing and quenching

1989-07-25

1990-11-20

Morris, Theodore

Metal treatment

Compositions

Heat treating

148 166, C23C 823, C23C 832

Patent

active

049716344

ABSTRACT:
A method of carburizing and quenching involves the following three steps of: pre-carburizing a steel member containing Cr with precipitating carbide by heating to achieve a surface carbon concentration of not less than 1%; spheroidizing the carbide obtained by alternately holding the steel member at a temperature slightly above and slightly below the A.sub.1 transformation temperature under a carbon potential of from 0.5 to 1.0%; and carburizing and quenching or carbo-nitriding and quenching the steel member followed by reheating at not more than the heating temperature of pre-carburizing.

REFERENCES:
patent: 2260249 (1939-08-01), Harder
patent: 4202710 (1980-05-01), Naito et al.
patent: 4836864 (1989-06-01), Murakami et al.
patent: 4921025 (1990-05-01), Tipton et al.

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