ASTM B163 N08825 Extruded Finned Tube for Seawater Cooling Heat Exchangers
Extruded finned tubes manufactured with ASTM B163 / ASME SB163 UNS N08825 (Incoloy 825) base material are engineered for highly corrosive seawater and marine cooling environments. The metallurgical bonding between the aluminum fin and the nickel-iron-chromium alloy tube ensures excellent heat transfer efficiency while maintaining long-term resistance to chloride-induced corrosion, pitting, and stress corrosion cracking.
This product is widely used in seawater-based cooling systems where conventional stainless steels are insufficient due to aggressive chloride exposure and fluctuating salinity conditions.
ASTM B163 N08825 extruded finned tubes are widely used in:
- Seawater cooling heat exchangers
- Offshore platform cooling systems
- Marine engine jacket water coolers
- LNG support cooling systems
- Coastal power plant seawater condensers
- Auxiliary seawater cooling loops
- Turbine heat rejection systems
- Offshore oil & gas processing units
- Produced water cooling systems
- Gas compression aftercoolers
- Chloride-rich process cooling systems
- Chemical industry corrosive fluid heat exchangers
- Base Tube Material: ASTM B163 / ASME SB163 UNS N08825 (Incoloy 825)
- Fin Material: High-purity aluminum (commonly AL1060)
- Fin Type: Extruded solid fin (integrated metal bonding)
- Manufacturing Process: Cold extrusion forming with metallurgical bonding
- Excellent resistance to seawater corrosion and chloride attack
- High thermal conductivity due to aluminum fins
- Strong mechanical bonding between fin and tube
- Suitable for vibration and offshore operating conditions
- Long service life in marine environments
| Parameter | Range |
|---|---|
| Base Tube Outer Diameter | 12 mm – 50 mm |
| Base Tube Wall Thickness | 1.0 mm – 5.0 mm |
| Tube Length | 1 m – 25 m (customized) |
| Fin Height | 6 mm – 17 mm |
| Fin Thickness | 0.3 mm – 0.6 mm |
| Fin Pitch | 2.0 mm – 5.0 mm |
| Fin Density | 300 – 1000 fins/m |
| Element | Content (%) |
|---|---|
| Ni (Nickel) | 38.0 – 46.0 |
| Fe (Iron) | ≥ 22.0 |
| Cr (Chromium) | 19.5 – 23.5 |
| Mo (Molybdenum) | 2.5 – 3.5 |
| Cu (Copper) | 1.5 – 3.0 |
| Ti (Titanium) | 0.6 – 1.2 |
| C (Carbon) | ≤ 0.05 |
| Mn (Manganese) | ≤ 1.0 |
| Si (Silicon) | ≤ 0.5 |
| Others | Balanced |
| Property | Value |
|---|---|
| Tensile Strength | ≥ 586 MPa |
| Yield Strength (0.2%) | ≥ 241 MPa |
| Elongation | ≥ 30% |
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