ASTM A312 TP321H HWF Fin Tube with Carbon Steel Fin
ASTM A312 TP321H is a high-carbon version of the stabilized austenitic stainless steel grade 321. The "H" designation signifies its suitability for high-temperature service, guaranteeing enhanced elevated temperature strength while maintaining excellent resistance to intergranular corrosion due to its titanium stabilization.
The ASTM A312 TP321H HWF (High-Frequency Welded) Fin Tube with Carbon Steel Fin is a specialized bimetallic component engineered for demanding heat transfer applications. It combines a TP321H stainless steel base tube with a carbon steel external fin, creating a cost-effective solution where the corrosion resistance and high-temperature strength of the base tube are critical, while the fin operates in a less aggressive environment.
Chemical Composition
| Element | C | Si | Cr | Mn | P | Ni | Ti |
| Range | 0.04-0.10 | ≤ 0.75 | 17.00-20.00 | ≤ 2.00 | ≤ 0.045 | 9.00-13.00 | ≥5*C≤0.70 |
Mechanical Properties (Base Tube - TP321H)
| Tensile Strength | Yield Strength | Elongation | Hardness |
| ≥ 515 MPa (75 ksi) | ≥ 205 MPa (30 ksi) | ≥ 35% | ≤ 192 HB |
Key Features & Advantages
1.Optimized Cost-Efficiency: The carbon steel fin provides substantial cost savings compared to an all-stainless-steel construction, without compromising the core tube's performance.
2.Superior High-Temperature Strength: The TP321H base tube offers guaranteed minimum strength at elevated temperatures, making it suitable for superheater and high-temperature heat exchanger applications.
3.Excellent Intergranular Corrosion Resistance: Titanium stabilization prevents chromium carbide precipitation in the base tube during exposure to the sensitization temperature range (450°C - 850°C).
4.Robust Mechanical Bond: The HWF process creates a strong, metallurgical bond between the carbon steel fin and the stainless steel base tube, ensuring low thermal contact resistance and high durability.
5.Enhanced Heat Transfer: The extended fin surface significantly increases the external heat transfer area, improving overall thermal efficiency.
Comparison with Related Options
TP321H HWF with CS Fin vs. Solid TP321H Fin Tube:
The solid TP321H fin tube offers uniform corrosion resistance throughout but at a significantly higher material cost. The bimetallic version is the economical choice where the finned section is not exposed to a corrosive or oxidizing atmosphere severe enough to require stainless steel.
TP321H vs. TP321:
Standard TP321 has a lower maximum carbon content and prioritizes corrosion resistance. TP321H is specifically required for ASME-code high-temperature pressure components due to its guaranteed high-temperature strength.
Applications of ASTM A312 TP321H HWF FinTube
1.Power Plant Boilers: As superheater and reheater tubes in sections where the base tube must withstand high-temperature steam corrosion, while the fins are exposed to less aggressive flue gas.
2.Heat Recovery Steam Generators (HRSGs): In economizer and evaporator sections for recovering energy from turbine exhaust gases.
3.Petrochemical Heaters: For convection bank tubes in fired heaters where process-side corrosion resistance is needed, but the fin-side environment is manageable for carbon steel.
4.Industrial Air Heaters: Pre-heating combustion air or process streams, leveraging the cost-effectiveness of carbon steel fins for gas-side heat transfer enhancement.
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ASTM A312 TP321H HWF Fin Tube with Carbon Steel Fin For Boiler Images
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