Bimetallic Extruded Fin Tube
Extruded Finned Tubes
- Fin Tube Types: copper-aluminum fin tubes, steel-aluminum fin tubes, aluminum fin tubes, copper fin tubes.
- Base Tube Material: Carbon steel, alloy steel, copper tube.
- Fins: Aluminum 1060, Aluminum 1100, T2 copper
- Applications: Air coolers, heat exchangers, air heaters, economizers， waste heat recovery system.
Aluminum Extruded Fin Tubes for Sale
4 Types of Extruded Fin Tube: The composite finned tube type (steel-aluminum/copper-aluminum) is produced by placing an aluminum tube over a base tube, base tube material can be made of carbon steel, stainless steel, or copper and then go through cold extrusion to form integral fins, generating mechanical strength by combining the fin and the base tube. The single-metal (copper and aluminum) extruded fin tube is typically formed through the integral extrusion of a solid pure aluminum or pure copper tube.
AGICO supplies 2 types of aluminum-extruded fin tubes for sale: steel-aluminum and copper-aluminum fin tubes. We also produce and supply single-metal extruded fin tubes made from pure copper or aluminum tubes, known as copper fin tubes and aluminum fin tubes. Here are the size details:
Aluminum Extruded Fin Tube Size
| Parameter | Value / Range | Remarks |
|---|---|---|
| Base Tube Outer Diameter (OD) | 16, 19, 25, 32, 38, 42, 48, 51 mm | Standard mainstream sizes: 25 mm and 32 mm; other sizes available upon request. |
| Fin Height (H) | 8 / 10 / 12.5 / 14 / 16 mm | Height measured from the base tube surface to the fin tip. |
| Fin Pitch | 2.8 – 6.0 mm | For dusty/dirty environments, a larger pitch (e.g. ≥4 mm) is recommended to minimise fouling and clogging. |
| Fin Thickness | 0.35 – 0.6 mm | Thickness at the fin tip; can be adjusted per strength and heat transfer requirements. |
| Tube Length | Up to 18,000 mm | Standard maximum production length; can be cut to required length on site by the customer. |
Technical Specifications of Copper-Aluminum Extruded Fin Tubes
| Outer Diameter D（mm） | Fin Height h(mm) | Fin Thickness s(mm) | Fin Pitch t(mm) | Sleeve Tube Wall Thickness (mm) | Base Tube Wall Thickness (mm) | Heat Dissipation Area sw(m2/m) | Fin Aera Ratio a(sw/sn) | Weight (kg/m) | Working Temperature (℃) | Operating Pressure Differential |
|---|---|---|---|---|---|---|---|---|---|---|
| 26 | 5 | 0.3 | 1.5 | 1 | 2 | 0.496 | 13.16 | 0.812 | ≥150 | ≤15 |
| 30 | 7 | 0.4 | 2.5 | 1 | 2 | 0.462 | 12.25 | 0.995 | ||
| 36 | 8 | 0.4 | 2.5 | 1 | 2 | 0.634 | 12.61 | 1.490 | ||
| 39 | 9.5 | 0.4 | 2.5 | 1 | 2 | 0.777 | 15.46 | 1.640 | ||
| 42 | 10 | 0.4 | 2.5 | 1 | 2 | 0.883 | 15.61 | 1.692 | ||
| 45 | 10 | 0.4 | 3.5 | 1.5 | 2 | 0.796 | 13.34 | 1.720 | ||
| 45 | 10 | 0.4 | 3.5 | 2 | 3 | 0.733 | 12.28 | 2.000 | ||
| 48 | 11 | 0.4 | 3.0 | 1.5 | 3 | 0.943 | 15.01 | 2.270 | ||
| 50 | 12 | 0.3 | 3.0 | 1.5 | 3 | 1.100 | 16.62 | 2.380 | ||
| 55 | 14 | 0.3 | 2.0 | 1.5 | 3 | 1.901 | 28.81 | 2.526 | ||
| 60 | 15 | 0.3 | 2.0 | 1.5 | 3 | 2.229 | 29.56 | 2.720 |
What Is an Extruded Fin Tube?
The extruded finned tube is a high-performance fin tube component featuring integral, continuous fins formed directly onto the outer wall of a metal base tube via a cold extrusion process. Extruded fin tube usually refers to bimetallic extruded fin tubes, featuring extruded aluminum fins.
Bimetallic extruded fin tubes have an outer aluminum sleeve over a base tube structure; the base tube material can be carbon steel or copper, and the extruded fins are formed by cold rolling. For single-metal extruded finned tubes, fins are rolled directly on the base tube; there are extruded copper and aluminum fin tube types.
Why Use Aluminum as the Fin Tube Material?
Aluminum has the lowest specific gravity among common non-ferrous and ferrous metals, the lightweight aluminum fins can help reduce the weight of heat exchangers.
Bimetallic Extruded Fin Tube Types
Steel Aluminum Extruded Fin Tube
Steel-aluminum composite fin tubes are formed by cold-rolling a pressure-resistant base tube and an aluminum tube together on specialized machinery, overcoming the inability to weld aluminum to other metals. Also known as heat exchange tubes, heat dissipation tubes, or rolled-fin tubes, they leverage the pressure resistance of the base tube alongside the high thermal conductivity and ductility of aluminum, highlighting the distinct technical advantages of both materials.
The extruded fin tube has integrally rolled fins with smooth and burr-free surface, after it undergoes anodizing, it has a good appearance and excellent corrosion resistance. It is widely used for wet cooling processes in HVAC applications, drying, heating, and other heat-exchange applications.
Copper Aluminum Extruded Fin Tube
The copper-aluminum extruded fin tubes produced by AGICO has rolling fin structure on a copper-aluminum composite tube. They feature a tight bond, low thermal resistance, excellent heat transfer performance, high strength, minimal flow loss, and strong corrosion resistance. Our fin tubes provide good resistance to deformation under long-term thermal cycling for your heat exchange device.
Internal Medium for Copper-Aluminum Extruded Fin Tube
Copper-aluminum extruded fin tubes are typically used in air heat exchange applications involving a liquid inside the tube and air outside; the internal fluid is usually water, an aqueous mixture, ethylene glycol, or another cooling medium. Copper tube serves as the base tube, the internal medium must not be steam or heat-transfer oil; excessive pressure or temperature can cause the tube to deform, crack, leak, or bend.
Features of Extruded Fin Tube
- Good Heat Transfer Performance: It offers high thermal conductivity and typically absorbs and dissipates heat quickly. For aluminum has a thermal conductivity of approximately 211.9 W/m·K; it is a cost-effective solution compared to silver or copper.
- Low Air Resistance: It has smooth fin surfaces and no wrinkles; air can pass through the fin gaps easily.
- Large Heat Dissipation Area: The finning ratio of these extruded fin tubes can reach up to 22.7, providing a larger heat dissipation area per unit length than wrapped finned tubes.
- Long Service Life: The base tube and aluminum fins are tightly bonded into one single unit. A cladding layer is formed on the base tube, protecting it from contact with the ambient air.
- Stable Heat Transfer Performance: Resistant to dust accumulation and scaling; easy to clean and drain of surface water; capable of withstanding rapid temperature fluctuations; and able to maintain high heat transfer performance over the long term.
Manufacturing Process of Extruded Fin Tube
The extruded fin tubes are produced in 2 steps: first combining a base tube (made of carbon steel, stainless steel, copper, etc.) with an outer sleeve (typically aluminum or aluminum alloy); then subjecting the assembly to cold extrusion using rollers on a specialized mill (utilizing a three-roll cross-rolling method). During the rolling process, continuous, helical fins are formed by forcing the outer sleeve’s wall material upward.
How are extruded fins formed?
This extruded fin forming is a cold-working process that creates an integral structure with a seamless, gap-free bond between the fins and the base tube. Fin formation generally proceeds through 3 stages: cutting-in, extrusion, and shaping. As the entire process is carried out at ambient temperature without high-temperature welding, the microstructure and mechanical properties of the base tube remain unaltered.
Why Choose Us
AGICO has been focused on the R&D, production, and sales of finned tubes, including high-frequency welded (HFW) fin tubes, G-type embedded fin tubes, extruded aluminum fin tubes, wrapped finned tubes, and laser-welded finned tubes, and heat exchangers. Our factory owns production lines for high-frequency welding, laser welding, tube wrapping, and extrusion, alongside high-standard automatic cleaning lines, automatic argon-arc tube welding systems, and a full line of metal forming equipment.
- Fin Tube Design and R&D: Our independent laboratory is equipped with comprehensive thermal performance testing devices, helping us in fin tube design and technology upgrading.
- Main Market: In the past decades, our fin tube products have been exported to the following countries and regions, including the USA, Italy, Germany, Malaysia, Thailand, South Korea, Kuwait, the Czech Republic, Indonesia, Hong Kong, India, Iran, and Singapore.
- Customized Production Services: We offer custom manufacturing of non-standard products according to client specifications, as well as anti-corrosion processing.
- Quality Assurance: AGICO owns advanced testing equipment, so our fin tube products can meet customer standards and requirements, including X-ray and ultrasonic flaw detectors, hydrostatic testing machines, tensile testing machines, and metallographic analyzers—all supported by a physical-chemical laboratory and a complete inspection system.
Testing Devices and Extruded Fin Tubes Fabrication
FAQ of Extruded Fin Tubes
What’s the difference between extruded fin tubes and wrapped, embedded fin tubes?
Extruded finned tubes are produced via a mechanical extrusion process that forms fins directly onto a base tube (or sleeve), which is the major difference compared with wrapped and embedded fin tubes.
- Wrapped tubes involve spirally winding and welding a metal strip onto the base tube; The production cost is less, but at the cost of lower corrosion resistance and fin adhesion compared to extruded types.
- Embedded tubes require cutting grooves into the base tube before inserting the fins, the production cost is complex and high. Extruded tubes feature a simpler and firm structure and low production cost.
What are the common metal materials used for extruded finned tube production?
The base tube (inner tube) can be carbon steel, stainless steel, or copper—depending on operating conditions. The fins (outer tube) are typically tubes made of aluminum alloys (e.g., 6063 or 6061) or copper to offer excellent thermal conductivity.
What are the common technical specifications for extruded fin tubes?
You can have customized design of extruded finned tube specifications. Here are the details:
- Base tube: Outer diameter (e.g., 8–51 mm), wall thickness (e.g., 1.5–20 mm), and length (e.g., 0.5–24 m).
- Fins Size: Height (e.g., 5–32 mm), thickness (e.g., 0.2–0.7 mm), and fin pitch (e.g., 1.6–10 mm).
- Performance: Maximum operating temperature (e.g., approx. 290°C) and bond strength (e.g., interference fit of 0.2–0.4 mm).
How is the performance of extruded fin tubes in harsh operating conditions of corrosion or vibration.
Extruded fin tubes from AGICO offer long-term stability as follows, use our fin tubes can help you reduce maintenance costs.
- Corrosive environments: The aluminum outer tube completely covers the base tube, thereby avoiding crevice corrosion. They are suitable for applications of marine or offshore projects.
- Vibration environments: The fin and base tube are tightly bonded during extrusion process, offering superior vibration resistance.
How is the quality of extruded fin tubes supplied from AGICO?
AGICO supplies extruded fin tubes and other fin tubes strictly according to customer requirement, product quality is guaranteed as follows:
- Raw Material Inspection: Base tubes and aluminum materials are certified and analyzed for chemical composition, and inspected for surface defects.
- Process Control: We have accurate real-time control of temperature and pressure in during fin extrusion, and fin dimensions are measured periodically.
- Bond Strength Testing: AGICO goes through pull-out tests for finished fin tubes to verify that the bond strength level of fins and base tubes.
- Finished Product Inspection: We make comprehensive checks and inspections of finished fin tube product covering appearance, dimensions, and performance (e.g., hydrostatic testing).
How to choose the right extruded fin tube?
AGICO supplies extruded fin tubes and other fin tubes strictly according to customer requirement, product quality is guaranteed as follows:
- Does the operating environment involve corrosive conditions, high temperatures, or vibrations?
- What level of heat transfer efficiency is needed?
- What’s the budget for fin tubes? Find a balance between initial procurement costs and long-term maintenance costs.
Why is the extruded fin tube more expensive than some other fin tube types?
Extruded fin tubes have higher production costs, for they require high-precision specialized equipment and molds. While considering they can offer superior corrosion resistance, a long service life, and low maintenance costs, it is a better choice if you have enough budget.
What should be done if a finned tube is damaged during use?
For minor damage involving small leak points, you can choose to weld. If it is severely damaged, the most reliable solution is to replace the fin tubes with a new one.
