Multi-layered anti-coking heat resisting metal tube and the...

B - Operations – Transporting – 32 – B

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B32B 15/04 (2006.01) B21C 37/06 (2006.01) B21C 37/15 (2006.01) B23K 10/02 (2006.01) B23K 35/30 (2006.01) B32B 1/08 (2006.01) C10G 9/16 (2006.01) C10G 9/20 (2006.01) F28F 19/06 (2006.01)

Patent

CA 2303732

A multi-layered heat resistant metal tube is disclosed. This tube has excellent anti-coking characteristics and is suitable for use under the conditions where carbon tends to deposit and accumulate thereon due to contacting with hydrocarbons at a high temperature. The tube is made by forming weld-mounted overlaid layer of a Cr-Ni-Mo alloy by building-up welding over the inner surface and/or the outer surface of a substrate tube made of a heat resistant metal. The Cr-Ni-Mo alloy consists essentially of, by weight %, Cr: 36-49 wt%, Ni: 35-63 wt% and Mo: 0. 5-5 wt%. Building-up welding is preferably carried out by PPW (Plasma Powder Welding) in which the filler metal is supplied in the form of powder.

Est présenté un tube métallique multi-couche ignifuge. Ce tube présente d'excellentes propriétés anti-cokage et convient à un usage dans des conditions où du carbone tend à s'y déposer et s'y accumuler en raison du contact avec des hydrocarbures à haute température. Le tube est fabriqué par formage d'une couche de chevauchement en alliage Cr-Ni-Mo posée par soudage, et formation d'une soudure au-dessus de la surface intérieure et/ou de la surface extérieure d'un tube substrat fait d'un métal ignifuge. L'alliage Cr-Ni-Mo se compose essentiellement de Cr (36 à 49 % par poids), de Ni (35 à 63 % par poids) et de Mo (0,5 à 5 % par poids). La formation de soudure est, de préférence, exécutée par soudage au plasma à poudre (PPW) dans lequel le métal d'apport est sous forme de poudre.

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