ASME SA179 Carbon Steel Seamless L Type Fin Tube with 1060 Aluminum Fin
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ASME SA179 Carbon Steel Seamless Tube With 1060 Aluminum Fin Wound L Type Fin Tube For Air Cooler/ Heater
ASME SA179 carbon steel seamless base tube with 1060 aluminum L-type wound fin is a high-performance composite heat transfer element engineered for enhanced air-side thermal performance. It features a cold-drawn seamless carbon steel pressure vessel (ASME SA179 compliant) with helically wound 1060 aluminum fins in an interlocking L-profile configuration. This unique design combines the high thermal conductivity of aluminum fins (~200W/m·K) with mechanical robustness - the L-foot anchorage prevents fin loosening under airflow erosion and thermal cycling, designed for air coolers, heaters, and finned tube heat exchangers.
1.Product Overview
The trapezoidal section formed by rolling of L-shaped finned tube is consistent with the distribution of heat flow density, and the tubes are closely combined with high thermal efficiency, thus eliminating the contact thermal resistance caused by the gap between the fins.
Working temperature: 230°C characteristics: winding process, high production efficiency, uniform spacing, good heat transfer, high fin ratio, the base pipe can be protected from air erosion.
2.Chemical & Mechanical Properties
| ASME SA179 Chemical Composition (%) | |||||
| C | Mn | P | S | Si | Fe |
| ≤ 0.06 - 0.18% | 0.27 - 0.63% | ≤ 0.035% | ≤ 0.035% | ≥ 0.10% (typically 0.25-0.50%) | Balance (≥ 98%) |
| Aluminum 1060 Fins Chemical Composition (%) | ||||||
| Al | Fe | Si | Cu | Mn | Zn | Else |
| ≥ 99.60% | ≤ 0.35% | ≤ 0.25% | ≤ 0.05% | ≤ 0.03% | ≤ 0.05% | ≤ 0.40% |
Mechanical Properties
| Component | Mechanical Performance | Key Features |
| ASME SA179 Base Tube |
· Tensile Strength: ≥325 MPa · Yield Strength: ≥180 MPa · Elongation (in 50mm): ≥35% · Hardness: ≤ 72HRB |
· Precision cold-drawn seamless tubing for minimum wall thickness · Thermal Conductivity: 52 W/m·K at 20°C · Superior resistance to oxidation and water corrosion · Maximum Operating Temperature: 450°C (843°F) for continuous service · Moderate strength: Suitable for low/medium-pressure heat exchangers. |
| Aluminum 1060 Fins | · Tensile Strength: 70-110 MPa · Elongation: 15-25% · Hardness: 23 HB. |
· Lightweight Design Reduces System Load · Ductile For Vibration Absorption |
3. Key Features
- High-Efficiency Heat Transfer Design
Helical L-type wound fin design maximizes heat dissipation area for superior air-side thermal performance
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Exceptional Mechanical Stability
Mechanically locked fins resist vibration and loosening, ideal for high-velocity airflow conditions
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Corrosion-Resistant Combination
Carbon steel base tube (internal protection) + 1060 aluminum fins (oxidation-resistant) for harsh outdoor/chemical environments
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Broad Temperature Range
Base tube withstands 400°C, aluminum fins operate stably up to 250°C
4. Key Applications
- Power Plant Boiler Economizers & Air Preheaters
- Petrochemical Process Heater/Furnace Convection Sections
- Industrial Kiln/Furnace Waste Heat Recovery Systems
- Various Industrial Heat Exchangers (Gas-Liquid, Gas-Gas)
- HVAC Systems
- Drying Equipment
- Marine Boilers & Heat Exchange Equipment
| Dimension | L-Type Fin Tube | KL-Type Fin Tube | LL-Type Fin Tube |
|---|---|---|---|
| Structure | • Aluminum fin with single L-shaped hook at root • Line contact with base tube |
• Knurled L-foot design • Grooves pressed into fin root for mechanical locking |
• Extended L-foot (Long Leg) • Double-hook structure at root |
| Vibration Resistance | ★★☆ (Better than embedded, weaker than KL/LL) |
★★★ (Excellent) |
★★★ (Dual hooks prevent loosening) |
| Thermal Contact Resistance | • Relatively high (Limited by line contact) |
• Lowest (Knurling increases contact area) |
• Low (Improved vs. L-type, but higher than KL) |
| Process Complexity | • Simple & mature (Lowest cost) |
• Higher (Requires precision knurling; cost ↑) |
• Moderate (Precision forming needed for dual hooks) |
| Max. Service Temp. | ≤ 250°C (Al fin) | ≤ 280°C (Knurling resists thermal expansion) |
≤ 260°C (Dual hooks resist thermal fatigue) |
| Typical Applications | • HAVC coils, economizers • Low-vibration environments |
• Power plant air preheaters • High-flow/high-vibration gas heat recovery |
• Air-cooled condensers (ACC) • Marine heat exchangers • Medium-vibration systems |
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