ASTM A312 TP321H High-Frequency Welded Finned Tube for Waste Heat Boilers
ASTM A312 TP321H High-Frequency Welded Finned Tube for Waste Heat Boilers is a high-performance heat transfer component designed for demanding thermal recovery systems. Manufactured with ASTM A312 TP321H austenitic stainless steel tubes as the base material, these finned tubes combine excellent high-temperature strength, oxidation resistance, and reliable heat transfer efficiency.
The high-frequency resistance welding process creates a strong metallurgical bond between the tube and fins, ensuring excellent mechanical stability under continuous thermal cycling, vibration, and high-temperature operating conditions. Compared with conventional finning methods, high-frequency welded fins provide a higher fin-to-tube connection strength and better long-term performance in harsh industrial environments.
TP321H is a stabilized stainless steel grade containing titanium, specifically developed for high-temperature service. It offers improved creep resistance and maintains mechanical properties during prolonged exposure to elevated temperatures, making it suitable for waste heat recovery equipment.
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Typical applications include:
- Waste heat boilers
- Heat recovery steam generators and heat recovery units
- Process gas heat recovery systems
- Petrochemical and chemical processing plants
- Refineries
- Power generation facilities
- Industrial furnaces and high-temperature exhaust gas systems
- Gas turbine exhaust heat recovery systems
These finned tubes are especially suitable for applications requiring high corrosion resistance, thermal stability, and long service life under elevated temperatures.
- Base Tube Material: ASTM A312 TP321H Stainless Steel
- Fin Type: High-Frequency Welded Helical Fins
- Manufacturing Process: High-frequency resistance welding
- High Temperature Performance: Excellent creep strength and oxidation resistance
- Strong Bonding: Continuous welded connection between tube and fin
- Thermal Efficiency: Increased heat transfer area compared with plain tubes
- Long Service Life: Suitable for continuous operation in demanding industrial environments
The following dimensions are commonly available for ASTM A312 TP321H High-Frequency Welded Finned Tubes. Customized dimensions can be manufactured according to customer drawings and project requirements.
| Item | Typical Range |
|---|---|
| Base Tube Outside Diameter | 16 mm – 219 mm |
| Tube Wall Thickness | 1.5 mm – 20 mm |
| Tube Length | Up to 18,000 mm |
| Fin Height | 6 mm – 30 mm |
| Fin Thickness | 0.8 mm – 3.0 mm |
| Fin Pitch | 2.0 mm – 10 mm |
| Fin Outside Diameter | 30 mm – 280 mm |
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.04–0.10 |
| Chromium (Cr) | 17.0–19.0 |
| Nickel (Ni) | 9.0–12.0 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Titanium (Ti) | 5 × C – 0.70 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation (50 mm) | ≥ 35% |
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