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.

1. Typical Applications

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

2. Product Structure & Features

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

Key Advantages

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

3. Size Range (Typical Manufacturing Capability)

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

4. Chemical Composition (UNS N08825 / Incoloy 825)

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

5. Mechanical Properties

Property	Value
Tensile Strength	≥ 586 MPa
Yield Strength (0.2%)	≥ 241 MPa
Elongation	≥ 30%

Ratings & Review

Overall Rating

4.0

Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings

5 stars

4 stars

100%

3 stars

2 stars

1 stars

All Reviews

K*w

Malaysia Feb 21.2026

Helpful (8)

It's hot and humid here, and our old wrap-on tubes used to rust like crazy. Switched to your extruded ones—the aluminum fin covers the steel pipe perfectly, so corrosion shouldn't be an issue.

Kumar

India Nov 8.2025

Helpful (2)

No corrosion issues so far, though we're running below dew point carefully. Installation was straightforward—tube sheets lined up, ends clean, rolling into the header went smooth.

I*n

Pakistan Aug 9.2024

Helpful (11)

Quality is top-tier, and the price is very competitive compared to others. Most importantly, the SA249 TP304 wall thickness is uniform and the welding looks beautiful.

Tags:

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

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Boiler Tube

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Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

Alloy Steel Heat Exchanger Tube

U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

products details

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube