ASTM A335 P22 High-Frequency Welded Finned Tube for HRSG
ASTM A335 P22 High-Frequency Welded Finned Tube is a high-performance heat transfer component specially designed for Heat Recovery Steam Generator (HRSG) systems. Manufactured by welding spiral fins onto alloy steel base tubes through high-frequency resistance welding technology, this type of finned tube provides excellent mechanical bonding strength, high thermal efficiency, and reliable performance under elevated temperature and pressure conditions.
ASTM A335 P22 is a chromium-molybdenum alloy steel grade with excellent high-temperature strength, creep resistance, and oxidation resistance. Due to these characteristics, P22 high-frequency welded finned tubes are widely used in HRSG pressure sections, especially in applications requiring long-term operation under high thermal loads.
The high-frequency welding process ensures a strong connection between the fin and tube surface, minimizing thermal resistance while maintaining structural stability during thermal cycling. This makes ASTM A335 P22 finned tubes suitable for demanding power generation and industrial heat recovery applications.
ASTM A335 P22 High-Frequency Welded Finned Tubes are commonly used in:
- Heat Recovery Steam Generators (HRSG)
- Waste Heat Recovery Systems
- Power Generation Plants
- Economizers
- Superheaters
- Reheaters
- High-temperature heat exchangers
- Material: ASTM A335 P22 alloy steel
- Fin Type: High-Frequency Welded Spiral Finned Tube
- Application: HRSG heat recovery systems
- High temperature performance: Excellent creep strength and thermal stability
- Strong fin attachment: High-frequency welded fins provide reliable mechanical bonding
- Long service life: Suitable for continuous operation under high temperature conditions
- High heat transfer efficiency: Enlarged surface area improves heat exchange performance
The dimensions of HRSG finned tubes can be customized according to project requirements, including tube diameter, wall thickness, fin height, fin thickness, and fin pitch.
| Item | Typical Range |
|---|---|
| Base Tube Material | ASTM A335 P22 |
| Outside Diameter of Tube | 25.4 mm – 168.3 mm |
| Tube Wall Thickness | 2.5 mm – 20 mm |
| Tube Length | Up to 18,000 mm (Customized) |
| Fin Height | 10 mm – 35 mm |
| Fin Thickness | 0.8 mm – 2.5 mm |
| Fin Pitch | 2.5 FPI – 10 FPI (Customized) |
| Fin Type | Spiral High-Frequency Welded Fin |
| Fin Material | P22 / Carbon Steel / Stainless Steel (According to Requirement) |
| Bare Tube Ends | Customized according to drawings |
Note: Final dimensions depend on HRSG design parameters, operating temperature, pressure, and heat transfer requirements.
ASTM A335 P22 is a chrome-moly alloy steel containing chromium and molybdenum elements to enhance high-temperature strength and corrosion resistance.
| Element | Chemical Composition (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | ≤ 0.50 |
| Chromium (Cr) | 1.90 – 2.60 |
| Molybdenum (Mo) | 0.87 – 1.13 |
| Iron (Fe) | Balance |
ASTM A335 P22 provides excellent strength retention at elevated temperatures, making it suitable for HRSG components exposed to thermal cycling and high-pressure steam environments.
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 163 HB |
| Density | Approx. 7.85 g/cm³ |
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