Continuous heat treatment furnace and utilizing the same,...

C - Chemistry – Metallurgy – 21 – D

Patent

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Details

C21D 9/08 (2006.01) C21D 1/00 (2006.01) C21D 1/74 (2006.01)

Patent

CA 2615962

One aspect of the present invention provides a continuous heat treatment furnace in which an atmosphere-control gas is introduced to a heating chamber 1 having a heating zone 1a, metal tubes are continuously charged along an axial direction from a furnace entrance 2a, and the metal tube subjected to a heat treatment is taken out from a furnace exit 2b. The continuous heat treatment furnace includes a front chamber 4 which has a preheating zone 3 on an entrance side of the heating chamber and seal curtains 5a and 5b which are located on an entrance side and an exit side of the front chamber. Another aspect of the present invention provides a metal tube subjected to the heat treatment using the continuous heat treatment furnace, and yet another aspect of the present invention provides a heat treatment method for performing the heat treatment using the heat treatment furnace. Desirably a rear chamber 6 is provided on an exit side of the heating chamber and seal curtains 7a are attached onto an entrance side of the rear chamber. Even if a post-cold working washing process is performed only by alkali degreasing and washing, an adhered substance to inner and outer surfaces of the metal tube can easily be removed before the heat treatment by the heat treatment furnace and the heat treatment method.

L~invention concerne un four de traitement thermique continu adapté pour introduire un gaz ambiant dans la chambre de chauffage (1) ayant une zone de chauffage (1a), pour charger en continu des tuyaux de métal dans une direction axiale à partir de l~entrée du four (2a) et pour décharger les tuyaux de métal après avoir subi un traitement thermique depuis la sortie du four (2b), où le compartiment antérieur (4) possédant une zone de préchauffage (3) est disposé sur le côté entrée de la chambre de chauffage et où des rideaux d~étanchéité (5a,5b) sont disposés sur le côté entrée et le côté sortie du compartiment antérieur. De plus, elle divulgue un tuyau de métal traité thermiquement par ce four de traitement thermique et un procédé de traitement thermique réalisé à l~aide du four de traitement thermique. On préfère que le compartiment postérieur (6) soit installé sur le côté sortie de la chambre de chauffage et que le rideau d~étanchéité (7a) soit installé sur le côté entrée du compartiment postérieur. Avec ce four de traitement thermique et ce procédé de traitement thermique, même si l~opération de nettoyage après formage à froid consiste uniquement en dégraissement et lavage alcalins, les fixations aux surfaces internes et externes des tuyaux de métal peuvent être retirées facilement avant le traitement thermique.

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