Multi-layered anti-coking heat resistant metal tube and method for manufacture thereof
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United States of America Patent
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-
Jun 17, 2003
Grant Date -
Jan 31, 2002
app pub date -
Jun 11, 2001
filing date -
Jun 12, 2000
priority date (Note) -
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Abstract
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%).gtoreq.0.5Cr(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.
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