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Nickel Alloy ASTM B163 Alloy 825 Incoloy 825 N08825 Extruded Fin Tube
What is extruded fin tube?
Aluminum extruded finned tubes, also called “integral finned tubes” using the form of the base tube covered with aluminum tube(the base tube can be carbon steel, stainless steel, copper) through machine extrusion, forming a tube fin, the fin base and
the tube outer wall is close fitting, this fin tubing control can
make finned tubes with high heat transfer coefficient and heat
transfer performance.
Extruded finned tube can be made of iron, copper or aluminum tube
by compound rolling, which has the advantages of tight bonding,
small thermal resistance, good heat transfer performance, high
strength, small flow loss, strong anti-corrosion performance, not
easy to deformation under long-term hot and cold working
conditions, long working life and so on.
Advantage of extruded fin tube
Compared with the ordinary wound finned tube, the contact thermal
resistance remains stable in a large range with the temperature
change, so the heat transfer performance of the bimetallic aluminum
extruded finned tube is better than the spiral fin tube in the
limit tube wall temperature range.
In addition, compared with the coiled tube, the bimetallic aluminum
extruded fin tube has outstanding corrosion resistance and high
strength, it can withstand 4.0MPa water pressure cleaning, the fins
still do not fall down, the base of the bimetallic aluminum
extruded tube.
The tube can be selected according to the corrosion of the fluid in
the tube and the processing technology. The base tube can be carbon
steel, copper, stainless steel, etc.
Chemical Composition Of N08825
Element | Ni | Cr | Mo | Cu | Ti | Iron | C | Mn | S | Si | Al |
% | 38.0-46.0 | 19.5-23.5 | 2.5-3.5 | 1.5-3.0 | 0.6-1.2 | 22.0 min (~33%) | 0.05 max | 1.0 max | 0.03 max | 0.5 max | 0.2 max |
Mechanical and Physical Properties
Alloy state | Tensile strength | Yield strength | Elongation | Brinell hardness | Density / Specific Gravity | Melting point |
Rm N/mm² | R P0. 2N/mm² | A 5 % | HRB Max | |||
N08825 | 517 | 172 | 30 | 200 | 8.1 kg/m³ 0.30 lb/in³ | 1370-1400℃ |
Hot Finished | ||||||
N08825 | 586 | 241 | 30 | 200 | ||
Cold Finished |
Applications
-Power plant
-Steam condensate system
-Chemical and petrochemical
-Food processing plant
-Air conditioning and refrigeration,
-Boilers,
-Finned tube economizers