ASTM A335 P22 Alloy Steel Seamless Tube High Frequency Welding Fin Tube For Economizer
ASTM A335 P22 Alloy Steel Seamless Tube High Frequency Welding Fin Tube For Economizer
Product Overview
The ASTM A335 P22 HFW Fin Tube is a high-efficiency heat transfer component, crafted by welding serrated or solid alloy fin strips onto a seamless P22 alloy steel tube using high-frequency resistance welding. It is specifically engineered for economizer coils in power plants, industrial boilers, and waste heat recovery systems, where high temperature and pressure resistance are critical.
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: HFW process ensures close bonding between fins and tube, maximizing surface area and thermal performance.
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Durability Under Pressure: P22 alloy steel offers high strength and creep resistance, making it suitable for high-pressure steam applications.
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Oxidation & Corrosion Resistance: Chromium-molybdenum alloy composition provides strong resistance to oxidation, scaling, and corrosion at elevated temperatures.
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Enhanced Lifespan: Serrated fins improve turbulence and cleaning efficiency, reducing fouling and increasing operational life.
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Cost Efficiency: Ideal for long-term operation in power plants, reducing maintenance frequency and downtime
Applications
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Boiler Economizers in Thermal Power Plants
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Waste Heat Recovery Boilers (WHRB)
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Refinery Heaters and Process Units
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Chemical Plant Steam Generators
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Industrial Heat Recovery Systems
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Preheater Sections of Steam Generating Units
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