Process and equipment for the heat treatment, before hardening,

Details Process and equipment for the heat treatment, before hardening, Process and equipment for the heat treatment, before hardening,

1989-12-19

1991-09-03

Kastler, S.

Metal treatment

Compositions

Heat treating

266251, 266257, C21D 100

Patent

active

050451260

ABSTRACT:
The invention is exclusively concerned with heat treatments before hardening, of metallic pieces, by cementation, carbonitridation and heating. The process concerns the feeding of a non muffle heat treatment furnace with various components including nitrogen which is produced by an adsorption or selective permeation generator and which has a residual oxygen content of the order of 2%. According to the invention, after the furnace has ceased to be in operation for a substantial period of time, it is reconditioned by injecting purer nitrogen which has a residual oxygen content lower than 0.3% and which is produced by said generator, adjusted at a lower extraction rate.

REFERENCES:
patent: 4279406 (1981-07-01), Bourhis et al.
patent: 4805881 (1989-02-01), Schultz et al.
Iron and Steel Engineer, vol. 39, No. 8, Aug. 1962, pp. 124-134; R. Herbert et al.: "Nitrogen Form an Air Separation Plant as a Heat-Treating Atmosphere".
Metal Progress, vol. 127, No. 6, May 1985, p. 67, Metals Park, Ohio, US; "New Products: New Air Separation Technology Makes Nitrogen for Heat Treating".
Journal of Heat Treating, vol. 5, No. 2, 12/1988, pp. 97-114, Springer--Verlag New York Inc., N.Y., U.S., J. Stycke et al.: "Assessment of Nitrogen Base Atmospheres for Industrial Heat Treating".
Steel in the U.S.S.R., vol. 15, No. 12, Dec. 1985, pp. 610-611, Londres, GB; V. M. Rebikov: "Single-Compocomponent Controlled Atmosphere in Muffle-Less Shaft Type Electric Furnace".

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