ASTM A335 P22 Solid Finned Tube With 11-13Cr Fins For Refineries and Petrochemical
ASTM A335 P22 HFW Solid Finned Tube with 11-13Cr Fins is a specialized type of heat exchanger tube designed for high-temperature and high-pressure applications. Here's a breakdown of its components and features:
1. Base Tube: ASTM A335 P22
(1). Chemical Composition of ASTM A335 P22 (Weight %)
| Element | Composition Range (%) |
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) (max) | 0.025 |
| Sulfur (S) (max) | 0.025 |
| Silicon (Si) | 0.50 max |
| Chromium (Cr) | 1.90 – 2.60 |
| Molybdenum (Mo) | 0.87 – 1.13 |
Notes:
Small amounts of residual elements (Cu, Ni, etc.) may be present but are not specified.
The Cr-Mo alloy provides high-temperature strength and oxidation resistance.
(2). Mechanical Properties of ASTM A335 P22
| Property | Value |
| Tensile Strength (min) | 415 MPa (60,000 psi) |
| Yield Strength (min) | 205 MPa (30,000 psi) |
| Elongation (min, %) | 30% (in 50 mm) |
| Hardness (max) | 250 HB (Brinell) / 25 HRC (Rockwell C) |
Additional Notes:
Heat Treatment: P22 tubes are typically supplied in normalized and tempered condition for optimal mechanical properties.
Impact Testing: Required for certain applications (e.g., ASME Boiler & Pressure Vessel Code).
High-Temperature Performance: Retains strength up to 593°C (1100°F).
2. Manufacturing Process: HFW (High-Frequency Welded
- The tube is manufactured using High-Frequency Welding (HFW), a process that ensures a strong, consistent weld seam.
- HFW tubes are cost-effective compared to seamless tubes while maintaining good mechanical properties.
3. Finned Tube Design: Solid Fins with 11-13% Chromium (Cr)
Fin Type: Solid fins (as opposed to serrated or embedded fins) for better durability.
Fin Material: 11-13% Chromium steel, offering:
- High corrosion resistance (especially against oxidation at elevated temperatures).
- Good heat transfer efficiency due to the finned surface area.
- Fin Attachment: Fins are typically welded or integrally formed onto the base tube.
4. Key Advantages
- Enhanced Heat Transfer: Fins increase the surface area, improving thermal efficiency.
- High-Temperature Performance: P22 base material + Cr-rich fins resist oxidation and creep.
- Cost-Effective: HFW manufacturing reduces costs compared to seamless alternatives.
5. Comparison with Other Fin Types
- 11-13Cr Fins vs. Low-Alloy Steel Fins: Better oxidation resistance at high temperatures.
- Solid Fins vs. Serrated Fins: More durable but may have slightly lower heat transfer efficiency than serrated fins in some cases.
The ASTM A335 P22 HFW (High-Frequency Welded) Solid Finned Tube with 11-13% Chromium (Cr) Fins is designed for high-temperature, high-pressure, and corrosive environments where efficient heat transfer and durability are critical. Below are its key applications:
1. Power Generation (Boilers & Heat Recovery Systems)
- Superheaters & Reheaters:
- Used in coal-fired, gas-fired, and biomass power plants to increase steam temperature efficiently.
- The 11-13Cr fins resist oxidation and flue gas corrosion at high temps (up to 600°C+).
- Economizers:
- Recovers waste heat from exhaust gases to preheat boiler feedwater.
- HFW P22 base tube handles high-pressure steam/water cycles.
- Heat Recovery Steam Generators (HRSGs):
- Captures heat from gas turbine exhaust to produce steam for additional power generation.
2. Petrochemical & Oil Refining
- Fired Heaters & Process Furnaces:
- Transfers heat to hydrocarbons in cracking units (e.g., ethylene production).
- Cr-Mo P22 base material resists sulfidation (sulfur attack) in refinery environments.
- Catalytic Reforming Units:
- Withstands hydrogen-rich atmospheres (resistant to hydrogen embrittlement).
3. Chemical Processing
- High-Temperature Reactors:
- Used in ammonia, methanol, and sulfuric acid production.
- Waste Heat Boilers:
- Recovers energy from exothermic reactions.
4. Waste Incineration & Biomass Plants
- Corrosive Flue Gas Handling:
- The 11-13Cr fins resist chlorine/sulfur compounds from burning waste or biomass.
- Air Preheaters:
- Improves combustion efficiency by preheating intake air with exhaust heat.
Key Industries & Use Cases
| Industry | Typical Application |
| Power Plants | Boilers, superheaters, economizers |
| Oil & Gas | Fired heaters, coker units |
| Chemicals | Reactors, reformer furnaces |
| Waste-to-Energy | Incinerator heat recovery |
Conclusion
This finned tube is ideal for high-temperature, high-pressure environments where corrosion resistance and heat transfer efficiency are critical. The combination of P22 alloy steel base tube and 11-13Cr fins ensures long-term performance in demanding industrial applications.
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ASTM A335 P22 Solid Finned Tube with 11-13Cr Fins for Heat Exchangers Images
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