Process and apparatus for heat treating articles while hardening

Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal

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Details

148626, 148633, 266251, 266254, 55 27, 55 68, 55 75, C21D 600, C21D 900

Patent

active

051586258

ABSTRACT:
Process for heat treating articles by hardening them in a recirculating gas medium which is in contact with the treated articles, the hardening gas being cooled by means of a heat exchanger, of the type in which helium is used as hardening gas, and is stored under holding pressure in a buffer container, wherein at the end of a hardening operation, a helium load is extracted from the treatment enclosure, in final phase by means of pump until a primary vacuum is obtained, the extracted helium is brought to purifying pressure by means of a compressor associated to a mechanical filter, and the helium under purifying pressure is sent to a purifier in which impurities are removed, after which it is transferred, if desired, after recompression in the buffer container.

REFERENCES:
patent: 2450081 (1948-09-01), Burkhardt
patent: 3713271 (1973-01-01), Franz et al.
patent: 4675030 (1987-06-01), Garnecki et al.
patent: 4867808 (1989-09-01), Heilmann et al.

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