Heat exchanger tube, method of manufacturing heat exchanger tube, and fluidized-bed furnace
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United States of America Patent
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Mar 1, 2011
Grant Date -
Jul 12, 2007
app pub date -
Dec 27, 2006
filing date -
Dec 28, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A heat exchanger tube 41 includes: a first cover layer 44 provided on an outer side of a tube main body 42 to partly or completely cover a tube main body 42; and a second cover layer 45 provided on an outer side of the first cover layer 44 to partly or completely cover the first cover layer 44. The first cover layer 44 is formed by overlay-welding a material higher in ductility than the second cover layer 45 to the tube main body 42. The second cover layer 45 is formed by overlay-welding a material higher in hardness than the first cover layer 44 to the first cover layer 44.
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