Method for manufacturing metal pipe

Details Method for manufacturing metal pipe Method for manufacturing metal pipe

C - Chemistry, Metallurgy

23

C

C23C 8/10 (2006.01) B21C 37/20 (2006.01) B21C 37/22 (2006.01) B21C 37/30 (2006.01) C21D 7/06 (2006.01) C21D 9/08 (2006.01) C22C 19/05 (2006.01) C22C 38/00 (2006.01) C22C 38/60 (2006.01)

Patent

CA 2750014

In this method, the inner surface of a metal pipe containing, by mass percent, 20 to 55% of Cr and 20 to 70% of Ni is subjected to mechanical treatment, the metal pipe is subjected to heat treatment such as to be held in a temperature range of 1050 to 1270°C for 0.5 to 60 minutes, and thereby an oxide scale layer consisting mainly of Cr is formed on at least the inner surface of the metal pipe. A metal pipe excellent in carburization resistance and coking resistance in a carburizing gas environment can be obtained by the method.

Cette invention concerne un procédé de production d'un tube métallique présentant une excellente résistance à la carburation et à la cokéfaction en atmosphère gazeuse carburante. La surface interne d'un tube métallique contenant de 20 à 55 % en masse de Cr et de 20 à 70 % en masse de Ni est soumise à un traitement mécanique suivi d'un traitement thermique dans une plage de températures allant de 1 050 à 1 270 ºC pendant 0,5 à 60 minutes. Ainsi, une couche de calamine contenant principalement du Cr est formée au moins sur la surface interne du tube métallique.

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