ASTM A312 Stainless Steel Seamless TP321H HFW Finned Tubes for Large Heat Transfer Equipment
ASTM A312 TP321H seamless stainless steel high-frequency welded (HFW) finned tubes are made of titanium-stabilized high-carbon austenitic stainless steel as the base material, combined with the high-efficiency HFW finning process.
They are mainly applied in heat transfer systems operating under high temperatures ranging from 427°C to 816°C, corrosive conditions, and thermal cycling environments. Particularly suitable for power plant boilers, petrochemical heating/waste heat recovery, chemical heat exchange, and special industrial heating scenarios, these tubes balance mechanical strength, intergranular corrosion resistance, and heat transfer efficiency.
Typical Application Scenarios
1.Power Industry
Coal-fired/gas-fired power plants: Superheaters, reheaters, economizers of boilers, and flue gas waste heat recovery units.
Nuclear power plants: Heat transfer tubes in secondary loop steam generators.
2. Petrochemical and Oil Refining Industry
Tubular heaters: Finned tubes in convection and radiant sections.
Fluid Catalytic Cracking (FCC): Finned tubes in regenerators and waste heat boilers.
Hydrocracking/hydrofining: Feed heaters for reactors.
3. Chemical and Coal Chemical Industry
Ammonia/urea production plants: Finned tubes in reformers and waste heat boilers.
Sulfuric acid/nitric acid production: Heat exchangers.
Coal chemical gasifiers: Radiant waste heat boilers.
Base Tube Chemical Composition
| Carbon% | Manganese% | Phosphorus% | Sulfur% | Silicon% | Nickel% | Chromium% | Nitrogen% |
|---|---|---|---|---|---|---|---|
| 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 9.0-12.0 | 17.0-19.0 | 0.10 |
The titanium content shall be not less than five times the carbon content and not more than 0.70%.
| Tensile Strength, min | Yield Strength, min | Elongation in 2" or 50mm, min |
|---|---|---|
| 75ksi (515 MPa) | 30ksi (205 MPa) | Longitudinal:35%; Transverse:25% |
ASTM A312 TP321H HFW Finned Tubes Advantages
For large-scale heat transfer equipment (e.g., power plant boilers, petrochemical tubular heaters, coal chemical waste heat boilers), ASTM A312 TP321H seamless HFW finned tubes deliver targeted advantages that address the core challenges of high load, harsh conditions, and long-term reliability.
1.High-Temperature Stability for Continuous Heavy Loads
2.Superior Corrosion Resistance
3.HFW Finned Design Boosts Heat Transfer Efficiency for Large Equipment
4.Seamless Structure Enhances Reliability Under High Pressure
5.Cost-Effectiveness for Large-Scale Deployments
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.