ASTM A179 Embedded Finned Tube with Al1060 Fins For Air-Cooled Heat Exchangers
ASTM A179 Embedded Finned Tube with Al1060 Fins For Air-Cooled Heat Exchangers
An ASTM A179 Embedded Finned Tube with Aluminum 1060 fins is a carbon steel heat exchanger tube with aluminum fins that are mechanically bonded by being embedded into grooves on the tube's outer surface. It's designed for efficient, low-to-medium temperature heat transfer in non-corrosive or mildly corrosive environments.
Here are some detailed breakdowns:
1. Base Tube: ASTM A179 seamless tube
Low Carbon Steel (typically ≤0.18% C) – excellent for cold drawing and formability.
(1) Chemical Composition of ASTM A179 seamless tube
Chemical Composition (Heat Analysis, %)
ASTM A179 is a seamless low-carbon steel tube designed for maximum heat transfer efficiency and formability.
| Element | ASTM A179 Requirement |
| Carbon (C) | ≤ 0.18% |
| Manganese (Mn) | 0.27 - 0.63% |
| Phosphorus (P) | ≤ 0.035% |
| Sulfur (S) | ≤ 0.035% |
| Silicon (Si) | ≥ 0.27% (when specified for elevated temperature service) |
Deoxidation Practice: A179 tubes are fully killed steel, meaning they are fully deoxidized with silicon or aluminum, resulting in superior internal surface quality and resistance to aging.
(2). Mechanical Properties
Properties are specified for tubes in the cold-drawn, annealed, or normalized condition. The cold-drawn condition is most common.
| Property | ASTM A179 Requirement (Cold-Drawn) |
| Tensile Strength (min) | 325 MPa (47,000 psi) |
| Yield Strength (min) | 180 MPa (26,000 psi) |
| Elongation (min) | ≥ 35% (in 2 inches or 50 mm) |
Notes on Mechanical Properties:
- High Ductility: The minimum 35% elongation is exceptionally high, reflecting the tube's superior formability and ability to withstand bending and expansion during fabrication.
- Moderate Strength: The strength levels are adequate for heat exchanger pressure containment but are secondary to the primary goals of thermal performance and manufacturability.
- Hardness: Typically ranges from 72-85 HRB (Rockwell B), indicating a relatively soft, formable material.
2. Fins
(1) Fin’s Type: Embedded
How it's made: A precise helical groove is machined (or rolled) into the steel tube wall. A strip of aluminum fin material is fed into the groove. A special rolling tool then "swages" or compresses the steel on both sides of the groove over the aluminum fin root, cold-forming the steel to mechanically lock the fin in place.
(2) Fin’s material: Aluminum 1060
Aluminum 1060 is a commercially pure aluminum (99.6% Al minimum).
Key Properties:
- Excellent Thermal Conductivity: ~230 W/m·K, which is about 4 times higher than carbon steel. This is the primary reason for using aluminum fins—they rapidly conduct heat from the tip to the base.
- Good Formability & Corrosion Resistance: Forms a protective oxide layer. Suitable for clean air applications.
- Lightweight & Cost-Effective.
3. Why This Combination? The Design Logic
| Component | Material Choice | Reason |
| Tube (Pressure & Containment) | A179 Carbon Steel | Strong, handles internal pressure of water/steam/refrigerant. Cold-drawn for clean internal bore. Cost-effective. |
| Fins (Heat Transfer) | Aluminum 1060 | Maximizes heat transfer efficiency due to high conductivity. Lightweight. Lower material cost than copper. |
| Bonding Method | Embedded (Mechanical) | Creates a tight, reliable bond without high heat. Avoids the galvanic corrosion issues that would occur at a brazed or welded joint between Al and steel. The steel "cold-welds" around the Al fin root. |
4. Key Advantages:
- Excellent Heat Transfer: The high conductivity of aluminum fins combined with a tight mechanical bond.
- Galvanic Corrosion Management: The embedded joint protects the aluminum root from direct exposure to the environment, slowing galvanic corrosion between Al and steel.
- No Heat-Affected Zone (HAZ): The cold-forming process doesn't alter the metallurgy of the steel tube (important for A179's properties)
- Good Cleanability: The helical fin design allows for cleaning with air/water jets.
Core Application Philosophy: Air-Cooled Heat Exchange
Unlike the previous A106/11-13Cr tube designed for heat recovery from hot gases, this tube is designed for heat rejection to air. The aluminum fins act as highly efficient "radiators" to maximize surface area for air-side heat transfer.
Detailed Industry Applications
1. Power Generation & Energy
- Air-Cooled Condensers (ACC) in power plants (especially in water-scarce regions)
- Auxiliary Coolers: Lube oil coolers, generator coolers, transformer oil coolers
- Closed Cooling Water System Coolers
2. HVAC&R (Heating, Ventilation, Air Conditioning & Refrigeration)
- Chiller Barrel Tubes in centrifugal and screw chillers
- Condenser & Evaporator Coils for large commercial AC systems
- Heat Pump Coils for geothermal and air-source systems
- Cooling Coils in air handling units (AHUs)
- Refrigeration Condensers in industrial refrigeration plants
3. Oil & Gas / Petrochemical
- Fin-Fan Air Coolers (ACHEs): The most common application
- Process fluid coolers in refineries
- Gas compressor aftercoolers
- Engine jacket water coolers
- Hydraulic oil coolers
- Charge Air Coolers (CAC) for turbocharged engines
- Lube Oil & Seal Oil Coolers
4. Industrial & Manufacturing
- Hydraulic System Coolers for injection molding machines, presses
- Laser Cooling Systems
- Transformer Radiators
- Process Water Cooling in chemical plants
- Compressed Air Aftercoolers
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