L-Type Wrapped Fin Tube | ASTM A179 Carbon Steel Base Tube +
Aluminum Fins
Product Introduction
Our L-Type Wrapped Fin Tubes (also known as L-Foot Tension Wound
Finned Tubes) are cost-effective and reliable heat transfer
components widely used in medium to low temperature applications.
The aluminum fin strip is formed into an L-shape and helically
wound under tension around the base tube, providing a strong
mechanical bond and good thermal contact.
This design offers an excellent balance between performance and
price, making it ideal for air-cooled heat exchangers and other
industrial cooling systems where operating temperatures remain
below 150°C.
Product Material
Base Tube: ASTM A179 / ASME SA179 Seamless Low-Carbon Steel Fin
Material: AL1060 (High-purity aluminum alloy)
Chemical Composition
Base Tube – ASTM A179 Carbon Steel
| Element | Content (%) |
|---|
| Carbon (C) | 0.06 – 0.18 |
| Manganese (Mn) | 0.27 – 0.63 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Silicon (Si) | ≤ 0.25 |
Fins – AL1060 Aluminum
| Element | Content (%) |
|---|
| Aluminum (Al) | ≥ 99.60 |
| Iron (Fe) | ≤ 0.35 |
| Silicon (Si) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.05 |
| Manganese (Mn) | ≤ 0.03 |
| Zinc (Zn) | ≤ 0.05 |
| Others | ≤ 0.03 |
Fin Tube Structure & Manufacturing Process
The L-Type Wrapped Fin Tube features a classic tension-wound
structure:
- Base Tube: ASTM A179 seamless cold-drawn low-carbon steel tube with
smooth outer surface.
- Fins: High-quality AL1060 aluminum strip, pre-formed into an "L"
shape (L-foot).
- Winding Process: The L-shaped aluminum strip is spirally wound
around the base tube under controlled tension. The L-foot covers
part of the tube surface, creating firm mechanical contact and
partial protection of the base tube from atmospheric corrosion. No
welding or adhesives are used — the bond relies on precise tension
and deformation.
This process ensures good fin-to-tube contact while remaining
economical to produce.
Dimensions & Tolerances (Typical Range)
| Parameter | Standard Range | Tolerance |
|---|
| Base Tube OD | 15.88 – 50.8 mm | ± 0.1 mm |
| Base Tube Wall Thickness | 1.0 – 3.5 mm | ± 10% |
| Fin Height | 6.35 – 19.05 mm | ± 0.2 mm |
| Fin Thickness | 0.35 – 0.50 mm | ± 0.05 mm |
| Fin Pitch | 5 – 12 FPI (fins per inch) | ± 1 FPI |
| Tube Length | 500 – 15,000 mm | ± 2 mm |
Custom sizes and specifications are available according to client
drawings.
Performance Advantages
- Cost-Effective Solution: Lower manufacturing cost compared to
embedded or extruded fins while maintaining good heat transfer
performance.
- Good Thermal Contact: Tension-wound L-foot design provides reliable
fin-to-tube bonding for efficient heat transfer.
- Atmospheric Corrosion Protection: Aluminum fins and L-foot
partially shield the carbon steel base tube.
- Lightweight Design: Aluminum fins significantly reduce overall
weight.
- Suitable for Medium-Low Temperatures: Safe continuous operation up
to 150°C.
- Easy Maintenance: Stable performance in clean to moderately
polluted environments.
Application Fields
Our ASTM A179 + AL1060 L-Type Wrapped Fin Tubes are widely used in:
- Air Cooled Heat Exchangers (ACHE)
- Condensers and Coolers in Petrochemical Plants
- Oil and Gas Cooling Systems
- HVAC and Refrigeration Equipment
- Compressor Intercoolers and Aftercoolers
- Power Plant Auxiliary Coolers
- General Industrial Process Cooling
Why Choose Us – Our Advantages & Experience
With more than 15 years of professional experience in manufacturing
and exporting various types of finned tubes, we specialize in
high-quality L-Type Wrapped Fin Tubes. Our key advantages include:
- Advanced automatic tension winding production lines with precise tension control for consistent fin bonding.
- Strict quality control including fin pull-out tests, dimensional
inspection, and hydrostatic testing.
- Full material traceability with EN 10204 3.1 Mill Test
Certificates.
- Rich export experience serving clients in Southeast Asia, Middle
East, Europe, and South America.
- Professional technical team offering customization and engineering
support.
- Competitive pricing, reliable delivery times, and excellent
after-sales service.
We are dedicated to providing efficient heat transfer solutions
that help customers reduce costs and improve system performance.
