ASTM A335 P22 HFW Serrated Finned Tube with AS Fins For HRSG and Economizers
ASTM A335 P22 HFW Serrated Finned Tube with AS Fins For HRSG and Economizers
It is a high-efficiency heat transfer component for high-temperature/pressure industrial service, consisting of a ASTM A335 P22 seamless alloy steel base tube with alloy steel serrated fins helically wound and bonded via HFW (High-Frequency Welded). It excels in heat transfer, fouling resistance, and structural integrity, widely used in power, petrochemical, and refinery heat exchangers.
1. Base Tube: ASTM A335 P22 seamless pipes
(1) Chemical Composition (Weight %) of ASTM A335 P22
| Element | Minimum | Maximum |
| Carbon (C) | 0.05 | 0.15 |
| Manganese (Mn) | 0.30 | 0.60 |
| Silicon (Si) | — | 0.50 |
| Chromium (Cr) | 1.90 | 2.60 |
| Molybdenum (Mo) | 0.87 | 1.13 |
| Phosphorus (P) | — | 0.025 |
| Sulfur (S) | — | 0.025 |
(2) Mechanical Properties (Room Temperature, Normalized + Tempered) of ASTM A335 P22
| Property | Requirement |
| Tensile Strength | 415 – 585 MPa (60,000 – 85,000 psi) |
| Yield Strength (0.2% Offset) | ≥ 205 MPa (30,000 psi) |
| Elongation in 50 mm | ≥ 30% |
| Charpy V-Notch Impact Energy | ≥ 27 J (20 ft-lbf) at −20 °C |
| Brinell Hardness (HBW) | ≤ 228 |
2. Fin Type: HFW Serrated Fins
- Serrated: Helically wound fins with notched edges; disrupts boundary layer, boosts turbulence, increases heat transfer area (3–10× vs. bare tube), and reduces fouling.
Fin Material: Alloy Steel (Typically 11-13% Chromium Steel)
- The chromium-rich alloy steel fins provide outstanding resistance to oxidation, corrosion, and sulfidation from hot flue gases. This protects the fin integrity in aggressive environments like refinery furnaces.
The component functions as a "hybrid" heat transfer device. The P22 alloy steel base tube is a pressure-containing part, designed to safely carry high-temperature fluids like steam or process oils. The serrated alloy steel fins are the heat exchange surface. Hot flue gases flowing over the outside of the tubes transfer their heat to the fins, which then efficiently conduct it to the tube and the fluid inside.
3. Performance Advantages
- Heat Transfer Efficiency: Serrations enhance turbulence and surface area; outperforms solid fins in gas–liquid/gas–gas heat transfer.
- High-Temp/Pressure Resistance: P22 base + alloy fins resist creep, oxidation, and hydrogen attack up to ~600°C.
- Fouling Resistance: Serrated edges break up deposits, reducing maintenance in dusty/corrosive flue gas or process streams.
- Structural Rigidity: Welded fin–tube bond withstands thermal cycling and vibration in boilers, economizers, and waste heat recoverers.
Applications of ASTM A335 P22 HFW Serrated Finned Tube (Alloy Steel Fins)
1. Power Plant Equipment
Boilers (water-wall panels, economizers)
Superheaters & Reheaters
Waste heat recovery units
Air preheaters
2. Petrochemical & Refinery Industry
High-temperature heat exchangers
Hydrogen processing units
Furnace coils & convection sections
Reformers & cracking units
3. Energy & Industrial Heat Recovery
Waste heat boilers
Combined heat and power (CHP) systems
Thermal oil heaters
Industrial waste heat recovery systems
4. Chemical & Process Plants
High-temperature/pressure process heat exchangers
Units exposed to creep, oxidation, and thermal cycling
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