Process for carburizing ferrous metal parts

Details Process for carburizing ferrous metal parts Process for carburizing ferrous metal parts

1993-07-23

1998-10-27

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148235, C23C 822

Patent

active

058273751

ABSTRACT:
The present invention provides a new and improved method of carburizing ferrous metal parts. In one embodiment the invention comprises the steps of heating the process chamber of a furnace to a temperature in excess of about 1100.degree. F., charging such parts to be carburized into the process chamber of the furnace, providing a carrier gas and feeding such carrier gas into the process chamber so as to provide a furnace atmosphere in the process chamber having a carbon potential of at least about 0.5%, providing a source of air and feeding such air to the process chamber so as to raise the carbon potential of the furnace atmosphere by at least 0.1%, and discharging the parts from the furnace. An enriching gas is fed into the process chamber along with the air. The enriching gas is a carbon (C) containing gas that may be decomposed to provide a source of free carbon (C).

REFERENCES:
patent: 3290030 (1966-12-01), Goehring
patent: 3413161 (1968-11-01), Goehring
patent: 4049472 (1977-09-01), Arndt
patent: 4306918 (1981-12-01), Kaspersma et al.
Metals Handbook : Gas Carburizing, AMS, ninth Edition, vol. 4 1979, pp. 135-175.
Carburizing With Direct-feed Mixtures of Natural Gas and Air, F. Kuhn, Heat Treatment of Metals 1993 pp. 39-44.

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