C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 4/08 (2006.01) B01J 19/02 (2006.01) B23K 35/30 (2006.01) B23K 35/32 (2006.01) C22C 27/06 (2006.01) F28F 19/06 (2006.01)
Patent
CA 2349137
The 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 Cr-Ni 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 alloy comprises 35% by weight or more of Cr and satisfies the relationship: Ni(w%) >0.5Cr. Building-up welding is referably carried out by PPW (Plasma Powder Welding) in which the filler metal is supplied in the form of powder.
Asari Seiya
Kato Yoshihisa
Shimizu Takao
Takeuchi Yuko
Tanaka Isao
Daido Tokushuko Kabushiki Kaisha
Riches Mckenzie & Herbert Llp
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