ASTM A312 TP321H High Frequency Welded Finned Tubes CS Fins for Power Plant
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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