High Efficiency Air Heater KL Finned Tubes - A179 + Aluminum

KL Type Wound Finned Tube (Base Tube A179 + Fin AL) for High-Efficiency Heat Transfer

1. Product Introduction: A179 Carbon Steel Base Tube with Aluminum Fins

The KL series wound finned tubes integrate a high-strength A179 carbon steel base tube with corrosion-resistant aluminum fins using advanced mechanical winding technology. Designed for extreme thermal cycling environments (operating range: -40°C to 250°C), these tubes amplify heat transfer efficiency by 4–8x compared to bare tubes. Ideal for gas-to-liquid heat exchange, the aluminum fins maximize surface area while the A179 base ensures structural integrity under 30 MPa pressure.

2. Finned Tube Structure & Manufacturing Process

• Base Tube: Seamless cold-drawn A179 carbon steel, providing leak-proof performance.

• Fins: Pure aluminum (AL 1100/AL 3003) strips wound helically for optimal turbulence.

• Embedding Process: 

• • Fins are tension-wound at 200–300 RPM into precision-cut base tube grooves.
  • Cold-work bonding creates a metallurgical interlock (shear strength >35 MPa) without welding.
  • Post-winding annealing eliminates residual stress.

3. Chemical Composition of Base Tube (A179) & Fin (AL)

Table: Material Composition Compliance (ASTM Standards)

4. Dimensional Tolerances & Specifications

Table: Precision Engineering Standards (Customizable Sizes)

5. Key Performance Advantages

• Thermal Efficiency: Fin-to-base contact ratio >96%, reducing thermal resistance.

• Corrosion Resistance: Aluminum fins self-passivate in humid/acidic environments (pH 4–9).

• Mechanical Durability: Withstands 50,000+ thermal cycles without fin loosening.

• Easy Maintenance: Smooth fin surface minimizes fouling; cleanable with air/water jets.

• Weight Reduction: 40% lighter than all-steel alternatives.

6. Application Fields

• Energy Recovery: Boiler economizers (reducing flue gas to 90°C), CHP systems.

• Process Industries: Sulfuric acid plants, refinery gas coolers, drying ovens.

• HVAC & Refrigeration: Evaporators/condensers for chillers (-30°C to 150°C).

• Renewable Energy: Biomass boilers, geothermal heat exchangers.

7. Our Manufacturing Expertise & Quality Assurance

With 15+ years in finned tube production, we guarantee:

• ISO 9001-Certified Production: Laser-measured dimensional checks every 50 tubes.
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• Custom Solutions: Tailor fin density/materials (e.g., AL 3003 for saltwater applications).
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• Testing Protocols: Hydrostatic pressure tests (2x design pressure), fin bond shear tests.

      Global Supply: 5,000+ tons/year capacity; lead time ≤4 weeks for bulk orders.