Extruded Finned Tubes | High Efficiency Bimetallic Aluminum Fin Tubes for Heat Exchangers
Extruded finned tubes are advanced heat transfer components manufactured by mechanically forming aluminum fins directly from an outer aluminum sleeve around a base tube.
Unlike traditional wrapped fin tubes where the fin strip is attached to the tube surface, extruded finned tubes feature an integral fin structure, creating a strong mechanical bond between the fin and tube.
This unique construction provides excellent thermal contact, high mechanical strength, and superior corrosion protection, making extruded fin tubes widely used in industrial heat exchangers, air cooled heat exchangers, power generation systems, and petrochemical applications.
- ●
Inner base tube: Carbon steel, stainless steel, copper, copper alloy, or other materials - ●
Outer aluminum sleeve: Extruded into continuous aluminum fins
This design allows engineers to select the best material combination for both heat transfer performance and corrosion resistance.
Structure and Working Principle of Extruded Finned Tubes
The working principle of an extruded finned tube is based on increasing the external heat transfer surface area. In many heat exchanger systems, air or gas has a much lower heat transfer coefficient compared with liquids flowing inside tubes. By adding aluminum fins outside the tube, the effective heat transfer area is significantly increased, improving overall heat exchange efficiency.
The aluminum fins are formed directly from the outer sleeve, eliminating gaps between the fin and tube. This reduces thermal contact resistance and improves heat conduction efficiency.
For bimetallic extruded fin tubes, the aluminum outer layer provides excellent protection against atmospheric corrosion, moisture, and environmental exposure.
Compared with conventional tension wound fin tubes, extruded fins have higher resistance against vibration, impact, and thermal cycling.
The continuous connection between the aluminum fins and base tube creates excellent thermal conductivity. This makes extruded fin tubes suitable for applications requiring compact heat exchanger designs and higher thermal performance.
One of the biggest advantages of extruded finned tubes is their aluminum protective layer. The aluminum fins cover the external surface of the base tube, helping protect carbon steel or other tube materials from corrosion caused by:
- Moisture
- Outdoor environments
- Salt atmosphere
- Industrial gases
Because the fin and tube form a strong mechanical structure, extruded finned tubes maintain stable performance during long-term operation. They are commonly selected for projects where equipment reliability is critical, maintenance access is difficult, and continuous operation is required.
| Type | Fin Connection | Main Advantage | Typical Applications |
|---|---|---|---|
| Extruded Finned Tube | Integral aluminum extrusion | High strength, corrosion resistance, excellent thermal contact | Air coolers, petrochemical, power plants |
| Embedded Fin Tube (G Type) | Aluminum fin embedded into tube groove | Good high-temperature performance | Heat exchangers, industrial heating |
| L Foot/LL/KL Fin Tube | Wrapped aluminum strip | Economical solution | HVAC, general cooling |
| Welded Fin Tube | Welded fin strip | High temperature and mechanical strength | Boilers, waste heat recovery |
Compared with conventional wrapped fin tubes, extruded finned tubes provide a more robust fin-to-tube connection and better protection in harsh operating environments.
Bimetallic extruded fin tubes are the most widely used type for industrial applications. Typical combination: Carbon steel tube + aluminum fins, Stainless steel tube + aluminum fins, Copper alloy tube + aluminum fins.
All-aluminum extruded fin tubes use aluminum for both tube and fins. Advantages: Lightweight construction, Excellent corrosion resistance, High thermal conductivity. Common applications: HVAC systems, Refrigeration equipment, Heat pump systems, Air cooling units.
Serrated extruded fin tubes have specially designed interrupted fins. The serrated structure improves airflow disturbance, reduces boundary layer effects, and can provide additional heat transfer performance where space is limited.
- Air cooled heat exchangers
- Gas processing equipment
- Compressor cooling systems
- Refinery cooling units
- Air cooled condensers (ACC)
- Cooling systems
- Heat recovery equipment
- Process coolers
- Heat exchanger systems
- Gas cooling equipment
- Condensers / Evaporators
- Chillers
- Heat pump systems
| Item | Specification |
|---|---|
| Base Tube Material | Carbon Steel, Stainless Steel, Copper Alloy |
| Fin Material | Aluminum |
| Fin Height | Customized |
| Fin Pitch | Customized |
| Tube Length | According to prect requirements |
| Application Temperature | According to material combination |
| Manufacturing Standard | Customer specification or international standards |
Higher temperatures require suitable base tube materials.
Different fluids require different tube materials: Water, Oil, Gas, Steam, Refrigerant.
Outdoor, coastal, and chemical environments usually require stronger corrosion protection.
Fin geometry, fin height, and fin pitch directly affect thermal performance.
As a professional finned tube manufacturer, we provide customized extruded finned tube solutions according to customer heat exchanger requirements.
Aluminum extruded fin tubes
Customized tube dimensions
Material selection support
Technical drawing review
From raw material inspection to finished tube testing, every production stage is controlled to ensure reliable performance for industrial projects.
Extruded fin tubes form aluminum fins directly from an outer sleeve, creating an integral structure. Embedded fin tubes use aluminum strips inserted into grooves machined on the base tube. Extruded fin tubes generally provide better corrosion protection and stronger mechanical performance.
Yes. Extruded finned tubes are one of the commonly selected solutions for air cooled heat exchangers because they provide large heat transfer surfaces, corrosion resistance, and long service life.
The most common design is a steel or stainless steel inner tube combined with aluminum outer fins. Other materials can be selected depending on temperature, pressure, and corrosion requirements.
Service life depends on operating conditions, materials, and environment. With proper material selection, extruded finned tubes can provide long-term reliable operation in industrial heat exchanger systems.
Looking for high-efficiency extruded finned tubes for your heat exchanger project?
Send us your tube specifications, drawings, or application requirements.
Our engineering team can help select the most suitable fin tube design for your project.
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