Nickel Alloy Extruded Fin Tube , ASTM B163 NO8825 Incoloy 825 Heat Exchanger Application
Nickel Alloy Extruded Fin Tube , ASTM B163 NO8825 Incoloy 825 Heat Exchanger Application
NO8825 which a nickel-iron-chromium alloy with the addition of molybdenum and copper. The chemical composition of this nickel steel alloy is designed to provide superior resistance to many corrosive environments. It is similar to Alloy 800 but has higher water corrosion resistance. It has excellent resistance to reducing and oxidizing acids, stress corrosion cracking, and localized corrosion such as pitting and crevice corrosion. Alloy 825 Incoloy 825 is particularly resistant to sulfuric and phosphoric acid. This nickel steel alloy is used in chemical processing, pollution control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production and pickling equipment.
Yuhong's Manufacturing process:
The aluminum fin strip is tension wound and placed into a groove cut into the tube with appr. 0.4mm fluted depth.
Applications:
The common application fields are:
- Heat exchangers units for power plant(electric, nuclear, thermal and geothermal power plants);
- High corrosive systems (condensers, evaporators, sea water desalinations, fertilizing, urea systems, ammonia, gas, corrosive acids);
- The petroleum, chemical and petrochemical industries;
- The food processing and refrigeration industries;
- Natural gas treatment;
NO8825 Chemical Composion:
| Element | Ni | Cr | Mo | Cu | Ti | Fe | 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 |
NO8825 Physical Properties:
| Density / Specific Gravity | 8.1 kg/m³ 0.30 lb/in³ |
| Melting point | 1370-1400℃ |
NO8825 Mechanical Properties:
| Alloy state | Tensile strength | Yield strength | Elongation | Brinell hardness |
| Rm N/mm² | R P0. 2N/mm² | A 5 % | HRB Max | |
| N08825 | 517 | 172 | 30 | 200 |
| Hot Finished | ||||
| N08825 | 586 | 241 | 30 | 200 |
| Cold Finished |
Technical details/base tube details/Fin details
Pipe Diameter: Min. OD 20mm to Max. OD 219mm.
Tube Thickness: Min. 2mm to 16mm
Pipe material: stainless steel, alloy steel, carbon steel, Corten steel, duplex steel, super duplex steel, Inconel, high chromium high nickel and some materials such as Incolloy, CK 20 material.
Fin detail
Fin Thickness: Min. 0.8 mm to max. 4 mm
Fin Height: 0.25" (6.35 mm) minimum to 1.5" (38 mm) maximum
Fin Density: Minimum 43 fins per meter, maximum. 287 fins per meter
Materials: Carbon Steel, Stainless Steel, Alloy Steel, Weathering Steel, Duplex Steel and Incolloy.
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