ASTM A312 TP321H High Frequency Welded Finned Tubes CS Fins for Power Plant
ASTM A312 This specification covers seamless, straight-seam welded, and heavily cold worked welded austenitic stain less steel pipe intended for high-temperature and general corrosive service,such as power plants, boilers, superheaters, and heat exchangers.Wall thickness generally for pipes is average.
TP321H is a high-carbon variant of 321 for improved high-temperature strength. Austenitic stainless steel with Titanium can prevent carbide precipitation (sensitization) during welding or high-temperature service.
TP321H with a excellent creep resistance and oxidation resistance at elevated temperatures,and suitable for boiler tubes, superheaters, and reheaters in coal-fired, gas-fired, and nuclear power plants. And the material has good resistance to sulfidation, steam oxidation, and acidic environments,can resistant to intergranular corrosion due to titanium stabilization.
Testing & Certification
• Hydrostatic testing
• Non-destructive testing (NDT) – Ultrasonic, Eddy Current
• Chemical & Mechanical Property Certification (MTC)
Chemical Composition (%) max S32109
| Grade | C | Mn | P | S | Si | Cr | Ni |
| TP321H | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 1.00 | 17.0-19.0 | 9.0-12.0 |
Mechanical Properties S32109
| Grade | Heat Treating Temperature | Tensile Strength,min | Yield Strength (0.2%Offset,min) |
| TP321H | Cold: 2000°F[1100°C] | Hot:1925°F[1050°C] | 75ksi (515 MPa) | 30ksi (205 MPa) |
Design Advantages ASTM A312 TP321H Solid Fin Tubes With CS Fins
| Enhanced Heat Transfer Efficiency | High thermal conductivity of carbon steel fins improves heat exchange.TP321H base tube ensures corrosion resistance in high-temperature steam/water environments.Extended surface area (due to fins) increases heat transfer rates in boilers, superheaters, and economizers. |
| High-Temperature & Creep Resistance | Titanium stabilization prevents sensitization (carbide precipitation) during prolonged high-temperature exposure.TP321H (high-carbon 321) offers superior creep resistance at a high temperatures. |
| Corrosion & Oxidation Resistance | CS fins (externally) can be coated/aluminized if exposed to harsh environments.TP321H inner tube resists steam oxidation and sulfidation&acid flue gas corrosion. |
| Cost Optimization | Carbon steel fins are cheaper than stainless steel, reducing overall cost while maintaining performance. |
Applications in Power Plant
High-pressure steam sections:Boiler tubes
Exposed to extreme heat:Superheaters & reheaters
Improving thermal efficiency:Air preheaters & economizers
Corrosion-resistant inside, cost-effective outside:Flue gas heat recovery systems
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ASTM A312 TP321H High Frequency Welded Finned Tubes CS Fins for Power Plant Images
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