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

Fins – AL1060 Aluminum

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)

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

• Marine Heat Exchangers

• 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.