High Efficiency Air Heater KL Finned Tubes - A179 + Aluminum

Price Negotiable

Price: Negotiable

MOQ: 10PCS

Delivery Time: Depends on quantity

Brand: YUHONG

Product Description

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)

Component	A179 Carbon Steel (%)	AL 1100 Aluminum (%)
C	0.06–0.18	≤ 0.20 (Fe + Si)
Mn	0.27–0.63	≤ 0.05 (Cu)
P	≤ 0.035	99.0+ Al (min)
S	≤ 0.035	–
Si	≤ 0.10	≤ 0.95 (Si)
Al	–	Balance

4. Dimensional Tolerances & Specifications

Table: Precision Engineering Standards (Customizable Sizes)

Parameter	Tolerance Range	Standard Size
Base Tube OD	±0.1 mm	15.88–50.8 mm
Base Tube Thickness	±10%	1.24–3.68 mm
Fin Height	±0.15 mm	12.7–19.05 mm
Fin Thickness	±0.02 mm	0.3–0.5 mm
Fin Density	±1 fin/inch	7–11 FPI (fins per inch)
Straightness	≤1.5 mm/m length	–

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.
Custom Solutions: Tailor fin density/materials (e.g., AL 3003 for saltwater applications).
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.