ASTM A179 L Finned Tube With Aluminum 1060 Fins For Air-Cooled Heat Exchangers
ASTM A179 L Type Finned Tube with Aluminum 1060 Fins is a type of heat exchanger tube designed for efficient heat transfer in applications such as boilers, condensers, and heat recovery systems.
Here's a detailed breakdown:
1. Base Tube (ASTM A179)
Material: Low-carbon steel (carbon content ≤ 0.06%)
Standard: ASTM A179 (Standard Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes)
(1) Chemical Composition (Weight %)
| Element | Composition (%) |
| Carbon (C) | ≤ 0.06 (max) |
| Manganese (Mn) | 0.27–0.63 |
| Phosphorus (P) | ≤ 0.035 (max) |
| Sulfur (S) | ≤ 0.035 (max) |
| Silicon (Si) | ≥ 0.10 (min) |
| Iron (Fe) | Balance |
Low carbon content ensures good weldability and formability.
Low sulfur & phosphorus reduce brittleness and improve corrosion resistance.
(2) Mechanical Properties
| Property | Value (Typical) |
| Tensile Strength | ≥ 325 MPa (47,000 psi) |
| Yield Strength | ≥ 180 MPa (26,000 psi) |
| Elongation (in 50 mm) | ≥ 35% (for wall thickness ≤ 0.015 in) |
| Hardness (Rockwell B) | ~ 72 HRB (typical) |
Additional Notes:
- Cold-drawn process enhances strength and surface finish.
- Good ductility (high elongation) allows for bending and forming.
- Smooth internal surface minimizes fouling in heat exchangers.
(3) Properties:
- Excellent thermal conductivity
- Good corrosion resistance (when properly maintained)
- Smooth inner surface for reduced fouling
- Typically used in moderate-temperature applications
2. Fins (Aluminum 1060)
Material: Aluminum alloy 1060 (99.6% pure aluminum)
Properties:
- High thermal conductivity (~235 W/m·K)
- Lightweight and corrosion-resistant
- Soft and malleable, making it easy to form fins
- Good resistance to oxidation
3. Fin Type: L-Type (Embedded Fins)
Construction: The aluminum fins are mechanically bonded (often by extrusion or wrapping) into a groove or knurled surface on the steel tube.
Advantages:
- Strong bond between fin and tube, reducing thermal resistance
- Better heat transfer efficiency compared to plain tubes
- Resistant to thermal cycling and vibration
4. Key Benefits
- Enhanced Heat Transfer: Fins increase the surface area, improving thermal efficiency.
- Corrosion Resistance: Aluminum fins protect the steel tube in mild environments.
- Cost-Effective: Combines the strength of steel with the thermal performance of aluminum
Key Application of ASTM A179 L Type Finned Tube with Aluminum 1060 Fins
The ASTM A179 L-Type Finned Tube with Aluminum 1060 Fins is widely used in heat transfer applications where enhanced thermal efficiency, corrosion resistance, and lightweight construction are essential. Below are its key applications:
1. Heat Exchangers & Condensers
- Air-Cooled Heat Exchangers (ACHEs) – Used in refineries, power plants, and chemical processing to cool process fluids (e.g., steam, oil, gases) using ambient air.
- Condensers – Efficiently condenses vapors (e.g., in refrigeration, HVAC, and power plant steam cycles).
- Economizers – Recovers waste heat from flue gases to preheat boiler feedwater.
Why this tube?
✔ Aluminum fins increase surface area for better heat dissipation.
✔ Lightweight compared to steel-finned tubes.
✔ Good corrosion resistance in mild environments.
2. Boilers & Thermal Power Plants
- Waste Heat Recovery Systems – Captures heat from exhaust gases to improve energy efficiency.
- Low-Pressure Boilers – Suitable for heat exchange in systems where temperatures stay below 300°C (Aluminum fins soften at higher temps).
Why this tube?
✔ ASTM A179 base tube handles moderate pressure and temperature.
✔ L-Type fin bonding ensures strong mechanical attachment.
3. HVAC & Refrigeration Systems
- Chiller Tubes – Used in cooling water circuits.
- Evaporators & Coolers – Efficient heat transfer in commercial refrigeration.
Why this tube?
✔ Aluminum 1060 fins provide excellent thermal conductivity (~235 W/m·K).
✔ Smooth inner surface of A179 reduces fouling.
4. Petrochemical & Oil Refineries
- Process Gas Cooling – Cools hydrocarbon streams in refineries.
- Lube Oil Coolers – Maintains optimal oil temperature in machinery.
Why this tube?
✔ Resists mild chemical exposure (for non-corrosive environments).
✔ Cost-effective compared to stainless steel finned tubes.
5. Industrial Drying & Heating Systems
- Heat Recovery Steam Generators (HRSGs) – Recovers heat from turbine exhaust.
- Duct Air Heaters – Used in industrial drying processes.
Why this tube?
✔ Aluminum fins improve air-side heat transfer.
✔ Durable in moderate thermal cycling.
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