EP 0375491 B1 19940413 - Method and installation for heat treatment for case-hardening, carbonitriding or heating before the quenching of metallic work pieces.
Title (en)
Method and installation for heat treatment for case-hardening, carbonitriding or heating before the quenching of metallic work pieces.
Title (de)
Verfahren und Anlage für Wärmebehandlungen wie Einsatzhärten, Karbonitrieren oder Erwärmung vor dem Härten von metallischen Werkstoffen.
Title (fr)
Procédé et installation de traitement thermique de cémentation, carbonitruration ou chauffage avant trempe de pièces métalliques.
Publication
Application
Priority
FR 8816792 A 19881220
Abstract (en)
[origin: US5045126A] 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.
IPC 1-7
IPC 8 full level
C23C 8/32 (2006.01); C21D 1/74 (2006.01); C21D 1/76 (2006.01); C23C 8/30 (2006.01)
CPC (source: EP US)
C21D 1/74 (2013.01 - EP US); C21D 1/76 (2013.01 - EP US); C23C 8/30 (2013.01 - EP US)
Citation (examination)
"Stealing nitrogen from the air", W. C. Quantz, Advanced Materials and Processes, vol. 134, no. 3, septembre 1988, p. 100-107.
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0375491 A1 19900627; EP 0375491 B1 19940413; AT E104361 T1 19940415; AU 4713389 A 19900628; AU 625618 B2 19920716; CA 2005823 A1 19900620; CA 2005823 C 19941213; DE 68914624 D1 19940519; DE 68914624 T2 19940721; ES 2050834 T3 19940601; FR 2640646 A1 19900622; FR 2640646 B1 19930205; JP H02217459 A 19900830; PT 92615 A 19900629; PT 92615 B 19950912; US 5045126 A 19910903; ZA 899627 B 19900926
DOCDB simple family (application)
EP 89403347 A 19891204; AT 89403347 T 19891204; AU 4713389 A 19891220; CA 2005823 A 19891218; DE 68914624 T 19891204; ES 89403347 T 19891204; FR 8816792 A 19881220; JP 32620289 A 19891218; PT 9261589 A 19891219; US 45243289 A 19891219; ZA 899627 A 19891215