Method of carburizing workpiece

Details Method of carburizing workpiece Method of carburizing workpiece

1983-05-23

1985-05-28

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

C23C 1110

Patent

active

045198535

ABSTRACT:
The method of carburizing steel workpieces comprises loading workpieces to be carburized in a furnace and maintaining them in a carbon enriching atmosphere comprising carbon monoxide, hydrogen and nitrogen. The treatment comprises a first phase carried out at a temperature from 850.degree. C. to 1050.degree. C. followed by a second phase carried out at a temperature from 700.degree. C. to 950.degree. C. During the first phase an atmosphere is used having a carbon potential from about 1.1% to about 1.6% by weight and during the second phase the amount of nitrogen in the atmosphere is increased from two to thirty times so that the carbon potential for the second phase is at least about 0.5% by weight less than the carbon potential for the first phase.

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patent: 4317687 (1982-03-01), Kaspersma et al.
patent: 4322255 (1982-03-01), Kostelitz
Metal Progress, "Drip Feed Carburizing", Nov. 1978, pp. 24-31.

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