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| Brand Name: | YUHONG |
| Model Number: | ASME SA213 T22 |
| MOQ: | 100 KGS |
| Price: | Negotiable |
| Payment Terms: | T/T,L/C |
| Supply Ability: | 4150 Ton Per Month |
Product Overview
SA213 T22 HFW serrated fin tubes demonstrate clear technical advantages in waste heat recovery applications within the 500–580°C temperature range. In this temperature interval, conventional carbon steel materials such as ASTM A192 exhibit significant performance degradation, with 10⁵-hour creep rupture strength of approximately 20 MPa at 550°C and oxidation rate of about 0.3 mm/year. In comparison, SA213 T22 (2.25Cr-1Mo steel) achieves a 10⁵-hour creep rupture strength of up to 80 MPa at 580°C, with oxidation rate below 0.1 mm/year and sulfur corrosion rate of approximately 0.08 mm/year. These performance metrics make it suitable for medium-to-high temperature flue gas waste heat recovery systems.
The heat treatment process significantly influences material performance, with normalizing at 900–950°C followed by tempering at 700–750°C forming bainitic microstructure and dispersed spherical carbides, which enhance high-temperature strength and creep resistance. The serrated fin design disrupts the airflow boundary layer through periodic notches, with measured data showing a 35–50% improvement in heat transfer coefficient while creating flow field characteristics that reduce ash deposition at elevated temperatures, extending cleaning intervals. The high-frequency resistance welding process ensures reliable metallurgical bonding between fins and base tube, suitable for long-term continuous operation.
Core Fact: When flue gas temperature exceeds 500°C, ordinary carbon steel (such as ASTM A192) rapidly enters a "death zone"—
In contrast, SA213 T22 (2.25Cr-1Mo steel) maintains exceptional performance in this temperature range:
This is the fundamental reason for its selection—in the 500–580°C high-temperature range, it's not merely "better," but the ONLY VIABLE SURVIVAL OPTION!
| Element | Content | High-Temperature Mechanism | Actual Effect |
|---|---|---|---|
| Cr (Chromium) | 1.90–2.60% | Forms dense Cr₂O₃ oxide film at high temperatures | Oxidation rate <0.1 mm/year at 550°C (vs. 0.3 mm/year for A192) |
| Mo (Molybdenum) | 0.87–1.13% | Inhibits dislocation movement and grain boundary sliding | Creep rupture strength reaches 80 MPa at 580°C (A192: 20 MPa) |
| C (Carbon) | 0.05–0.15% | Precise control of carbide precipitation | Balances high-temperature strength with weldability, prevents σ-phase embrittlement |
| Si (Silicon) | 0.10–0.50% | Enhances oxide film adhesion | Reduces scale spallation risk |
Critical Effects:
Waste heat recovery systems operating at 500–580°C face four critical challenges:
| Threat | T22 Serrated Fin Tube Solution | Verification Results |
|---|---|---|
| High-Temperature Creep | Mo strengthens grain boundaries; HFW eliminates stress concentration | After 8 years of operation in a 600MW plant, tube diameter expansion <0.5% (vs. 3% for A192 within 6 months) |
| Scale Spallation | Cr₂O₃ film + internal shot peening | Scale adhesion improved by 40%, spallation rate reduced by 60% |
| Thermal Fatigue Cracking | Optimized C content + serrated notches buffer thermal stress | No cracks after 500 thermal cycles (A192 typically fails before 100 cycles) |
| Sulfur Corrosion | Cr forms protective sulfide layer | Corrosion rate in sulfur-containing flue gas: 0.08 mm/year (vs. 0.35 mm/year for A192) |
Engineering Enhancement Measures:
Conclusion:
In the 500–580°C high-temperature range, T22 serrated fin tubes can operate safely for 10–15 years with an MTBF > 50,000 hours, whereas A192 inevitably fails within 6 months under the same conditions—this is the sole justification for its existence!
| Mechanism | High-Temperature Significance | Measured Effect |
|---|---|---|
| Active Boundary Layer Disruption | High-temperature flue gas has thicker boundary layer; serrated notches force separation | Heat transfer coefficient increased by 35–50% (more significant than with A192 applications) |
| Vortex Anti-Fouling Design | Ash softens above 500°C; serrated notches create "self-cleaning channels" | Fouling cycle extended by 2.5× (from 45 to 110 days) |
| Metallurgical Bond via HFW | Solves fin loosening caused by high-temperature creep | No fin detachment after 10 years of operation (mechanically expanded fins typically fail within 3 years) |
| Thermal Stress Buffer Structure | Serrated notches absorb thermal expansion stress | Reduces weld cracking risk by 70% |
| Dimension | Performance | Value Proposition |
|---|---|---|
| High-Temperature Performance | Maintains structural stability at 580°C | Fills the critical gap between A192 and T91 |
| Heat Transfer Enhancement | Serrated design increases flue gas-side heat transfer coefficient by 40%+ | Recovers 25%+ more heat in the same footprint |
| Economic Efficiency | 70–75% the cost of T91, with 80% of T91's service life | ROI typically <4 years (acceptable for high-temperature projects) |
| Reliability | Metallurgical HFW bond + creep resistance design | MTBF > 50,000 hours, suitable for continuous operation |
| Environmental Contribution | Every 10°C reduction in flue gas temperature ≈ 15,000 tons CO₂ reduction/year (600MW plant) | Supports "dual carbon" goals, enhances ESG ratings |
Address
20 Floor, No.1 New World Building, NO.1018 Min'an Road, Yinzhou District, Ningbo, China, ZIP:315040
Tel
+86-574-88013900
