Method of heat treatment for steel

Details Method of heat treatment for steel Method of heat treatment for steel

1997-09-30

1999-08-31

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148233, C23C 822

Patent

active

059449160

ABSTRACT:
A method of heat treating steel for use in transmission gears of a vehicle including the steps of carburizing the steel to 900-950.degree. C. quenching the carburizing steel at 830-850.degree. C., reheating the steel with ammonia gas to a temperature of 800-900.degree. C., and fusing the reheated steel at a temperature of 150-230.degree. C. for providing excellent anti-abrasion, contact fatigue strength and blending fatigue strength properties, thereby controlling the quality of steel in a furnace.

REFERENCES:
patent: 4913749 (1990-04-01), Hengerer et al.
patent: 5595610 (1997-01-01), Maeda et al.
patent: 5676769 (1997-10-01), Kawamura et al.
patent: 5769965 (1998-06-01), Liedtke et al.

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