EP 0451050 B1 19950301 - Process and equipment for thermal treatment with gas quenching.
Title (en)
Process and equipment for thermal treatment with gas quenching.
Title (de)
Verfahren und Einrichtung zur Wärmebehandlung mit Gasabschreckung.
Title (fr)
Procédé et installation de traitement thermique d'objets avec trempe en milieu gazeux.
Publication
Application
Priority
FR 9004309 A 19900404
Abstract (en)
[origin: EP0451050A1] Heat treatment of objects with quenching in a gaseous medium with recirculation (8) on contact of the said treated objects with cooling of the quenching gas by means of a heat exchanger, of the kind in which helium is employed as quenching gas, which is stored under pressure while waiting in a buffer vessel (2) into which, at the end of a quenching operation, the helium charge is extracted (27-28) out of the treatment enclosure, as a final stage using a pump (5) until a primary vacuum is obtained, the said extracted helium is raised to a purification pressure by a compressor (14) used in combination with a mechanical filter (15), and the said helium is taken to purification pressure in a purifier for removing impurities (20-35) in order to transfer it, if appropriate, after recompression, into the buffer vessel (2). <IMAGE>
IPC 1-7
IPC 8 full level
C21D 1/18 (2006.01); C21D 1/613 (2006.01); C21D 1/767 (2006.01); C21D 1/773 (2006.01); F27D 17/00 (2006.01)
CPC (source: EP US)
C21D 1/613 (2013.01 - EP US); C21D 1/767 (2013.01 - EP US); C21D 1/773 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE ES FR IT SE
DOCDB simple family (publication)
EP 0451050 A1 19911009; EP 0451050 B1 19950301; CA 2039515 A1 19911005; DE 69107651 D1 19950406; DE 69107651 T2 19950706; ES 2069234 T3 19950501; FR 2660669 A1 19911011; FR 2660669 B1 19920619; JP H06207214 A 19940726; US 5158625 A 19921027
DOCDB simple family (application)
EP 91400900 A 19910403; CA 2039515 A 19910402; DE 69107651 T 19910403; ES 91400900 T 19910403; FR 9004309 A 19900404; JP 6576391 A 19910329; US 68042391 A 19910404