ASME SA312 TP321H High-Frequency Welded (HFW) Fin Tube
The ASME SA312 TP321H High-Frequency Welded (HFW) Fin Tube is a high-performance heat transfer component engineered for extreme industrial environments. It combines the superior high-temperature strength and corrosion resistance of ASME SA312 TP321H stainless steel with the exceptional thermal efficiency of integrally welded fins. This makes it a critical solution in demanding applications across power generation, petrochemical, and process heating industries.
321H is a high-carbon austenitic stainless steel grade: the "H" denotes high carbon content (0.04–0.10%), which enhances high-temperature strength.Key Alloying Element: Titanium (Ti). This is the crucial stabilizer that prevents chromium carbide precipitation during exposure to high temperatures (450-900°C / 842-1652°F), which causes sensitization and intergranular corrosion.
Chemical Composition(%)
| TP321H Chemical Composition(%) |
| Element | C | Si | Cr | Mn | Ni | Ti |
| Range | 0.04-0.10 | ≤0.75 | 17.00-19.00 | ≤2.00 | 9.00-123.00 | 4*C-0.7 |
Mechanical Properties
| ASME SA312 TP321H Mechanical Properties |
| Tensile Strength | Yield Strength | Hardness | Elongation |
| 515MPa | ≥205MPa | ≤ 192HB | ≥35% |
Equivalent Material of TP321H
| ASTM/AISI | UNS NO | EN | ISO | JIS | GOST |
| TP321H | UNS32109 | 1.4874 | X7CrNiTi18-10 | SUS 321H | 08Ch18N12T |
Advantages of HFW Fin Tubes:
1.Stronger Bond: Metallurgical fusion provides superior resistance to vibration, thermal cycling, and fin peeling.
2.Higher Efficiency: Eliminates air gaps and flux residues, boosting heat transfer by 5–15% over rolled or brazed tubes.
3.Material Flexibility: Welds dissimilar metals (e.g., stainless to carbon steel) without needing ductility or specific alloys.
4.Greater Durability: Withstands high temperatures (800–850°C) and pressure without braze softening or stress cracking.
5.Lower Lifetime Cost: High-speed production and a 2–3x longer service life reduce total cost of ownership.
Applications Of ASME SA312 TP321H High-Frequency Welded (HFW) Fin Tube
1.Power Generation: Boiler superheaters, reheaters, economizers, and air preheaters in coal-fired and combined-cycle plants.
2.Petrochemical & Refining: Heat exchangers in catalytic reforming, hydrocracking, and ethylene pyrolysis furnaces; charge gas coolers.
3.Industrial Furnaces: Convection sections, radiant tubes, and waste heat recovery units in chemical, steel, and glass manufacturing.
4.Waste Heat Recovery Systems: Capturing and repurposing energy from high-temperature exhaust streams.
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ASME SA312 TP321H High Frequency Welded Fin Tube For Heat Exchanger Images
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