Extruded Finned Tubing for Waste Heat Recovery Systems A179 Carbon Steel, Al Fins
High-Efficiency Extruded Finned Tubes | A179 Carbon Steel Base with Aluminum Fins
1. Product Overview: Extruded Bimetal Finned Tubes
Material: Base Tube - ASME SA-179 Carbon Steel | Fins - Aluminum 1100/3003
Extruded finned tubes combine the superior pressure resistance of carbon steel with the exceptional thermal conductivity of aluminum fins. Through a cold extrusion process, fins are metallurgically bonded to the base tube, creating a seamless heat transfer surface ideal for high-corrosion and high-temperature applications.
2. Material Composition & Specifications
▶ Base Tube Material: ASME SA-179 Carbon Steel
| Element | Composition (%) | Standard |
|---|---|---|
| Carbon (C) | 0.06 - 0.18 | ASTM A179 |
| Manganese (Mn) | 0.27 - 0.63 | |
| Phosphorus (P) | ≤0.035 | |
| Sulfur (S) | ≤0.035 | |
| Iron (Fe) | Balance |
▶ Fin Material: Aluminum 1100/3003
| Element | Composition (%) |
|---|---|
| Aluminum (Al) | ≥99.0 (1100) / 98.6 (3003) |
| Copper (Cu) | ≤0.05 |
| Iron (Fe) | ≤0.45 |
| Manganese (Mn) | - / 1.0-1.5 |
3. Structural Design & Manufacturing Process
Base Tube: Seamless cold-drawn carbon steel (OD: 15.88 - 50.8 mm)
Fins: Helical aluminum fins (Height: 6-16 mm, Thickness: 0.8-1.2 mm)
Bonding: Cold Extrusion Process
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- Aluminum sleeve forced over base tube under 200-300 tons pressure
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- Fins extruded from sleeve with >35 MPa interfacial strength
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- Zero contact resistance (metallurgical bond)
4. Dimensional Tolerances (Per ASTM Standards)
| Parameter | Tolerance |
|---|---|
| Base Tube OD | ±0.10 mm |
| Fin Height | ±0.15 mm |
| Fins per Inch (FPI) | ±1 fin |
| Straightness | ≤1.5 mm/m |
5. Performance Advantages
- Heat Transfer Efficiency: 8-12x higher than bare tubes (fin surface ratio)
- Corrosion Resistance: Aluminum fins protect carbon steel core
- Fouling Resistance: Optimized fin spacing (3-5 FPI) for dusty gases
- Pressure Integrity: Base tube withstands 6.5 MPa working pressure
- Thermal Expansion Compatibility: Δα < 0.5×10⁻⁶/°C
6. Application Industries & Equipment
| Industry | Equipment |
|---|---|
| Power Generation | Waste heat boilers, Air preheaters, Economizers |
| Petrochemical | Process heaters, Reformers, Sulfur recovery units |
| Marine | Exhaust gas boilers, Desalination plants |
| Pulp & Paper | Recovery boilers, Flue gas condensers |
| HVAC | Thermal fluid heaters, Dehumidifiers |
7. Why Choose Our Finned Tubes?
- 15+ Years Expertise: ISO 9001-certified extrusion facilities
- Customization: Fin density (2-8 FPI), tube lengths (1-12m), coatings (anodized/Al-zinc)
- Quality Assurance:
100% pressure testing (hydrostatic/pneumatic)
Eddy current inspection of base tubes
Bond strength shear testing (per ASTM D1002)
Global Supply: MOQ 500 meters, lead time 4-6 weeks
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.