Alloy Steel Seamless Tube ASTM A335 P22 HFW Fin Tube For Furnace And Heater
Alloy Steel Seamless Tube ASTM A335 P22 HFW Fin Tube For Furnace And Heater
Product Overview
The ASTM A335 P22 HFW Fin Tube is a high-temperature alloy steel tube with high frequency welded (HFW) fins, designed for use in industrial furnaces, heaters, and boilers. The P22 alloy offers superior thermal strength, oxidation resistance, and creep resistance, making it suitable for continuous operation under extreme heat and pressure.
Chemical Composition
Base Tube – ASTM A335 P22
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.05–0.15 |
| Manganese (Mn) | 0.30–0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Chromium (Cr) | 1.90–2.60 |
| Molybdenum (Mo) | 0.87–1.13 |
Fin Material – 11-13Cr Strip
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 11.0–13.0 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
Mechanical Properties
Base Tube – ASTM A335 P22
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 163 HB |
Fin Material (Typical)
| Property | Value |
|---|---|
| Tensile Strength | Approx. 450–600 MPa |
| Yield Strength | Approx. 250–350 MPa |
| Hardness | 150–180 HB |
| Heat Resistance | Up to 600°C (continuous) |
Advantages
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Superior heat transfer performance for high-temperature gas environments.
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High mechanical strength and creep resistance for prolonged service at elevated temperatures.
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Excellent weldability and structural stability due to the seamless tube and HFW fin bonding.
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Corrosion and oxidation resistance ensures durability in aggressive heating environments.
Applications
Convection Section
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Location: The upper part of the furnace, after the radiant section.
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Function: This section uses convection heat transfer from hot flue gases to heat up the working fluid (such as steam, oil, or gas) inside the finned tubes.
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Why P22 Fin Tubes:
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High thermal conductivity of fins increases surface area → better heat transfer.
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Alloy P22 resists thermal stress, oxidation, and creep, making it ideal for continuous high-temperature exposure.
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Sometimes in Radiant Section (Secondary Heating Area)
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Conditionally, if the radiant section has lower radiant intensity or is partially shielded, these fin tubes may also be used here to recover radiant + convective heat.
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