ASTM A213 T22 HFW Serrated Finned Tube With Carbon Steel Fins For Furnace
ASTM A213 T22 HFW Serrated Finned Tube With Carbon Steel Fins For Furnace
ASTM A213 T22 HFW Serrated Finned Tube with Carbon Steel Fins is a specialized type of heat exchanger tube designed for high-efficiency thermal transfer in boilers, superheaters, and other high-temperature/pressure applications. Here’s a detailed breakdown of its components and characteristics:
1. Base Tube Specifications
(1) Chemical Composition (Weight %)
| Element | ASTM A213 T22 Requirements | Typical Values |
| Carbon (C) | 0.05–0.15% | 0.10% |
| Manganese (Mn) | 0.30–0.60% | 0.45% |
| Phosphorus (P) | ≤ 0.025% | 0.015% |
| Sulfur (S) | ≤ 0.025% | 0.010% |
| Silicon (Si) | ≤ 0.50% | 0.25% |
| Chromium (Cr) | 1.90–2.60% | 2.25% |
| Molybdenum (Mo) | 0.87–1.13% | 1.00% |
| Iron (Fe) | Balance | Balance |
Notes:
Key Alloying Elements: Cr and Mo provide oxidation resistance and high-temperature strength.
Low S/P: Minimizes hot cracking during welding.
(2) Mechanical Properties
| Property | ASTM A213 T22 Requirements | Typical Values |
| Tensile Strength | ≥ 415 MPa (60 ksi) | 450–550 MPa |
| Yield Strength (0.2% offset) | ≥ 205 MPa (30 ksi) | 240–300 MPa |
| Elongation (in 50 mm) | ≥ 30% (for longitudinal) | 35–40% |
| Hardness (Brinell) | ≤ 163 HBW | 140–160 HBW |
Additional Requirements:
Heat Treatment:
T22 tubes are typically supplied in the normalized and tempered condition (e.g., 900–950°C normalized, 680–730°C tempered).
High-Temperature Performance:
Creep Strength: ~34 MPa at 600°C (1,112°F) for 100,000 hours.
Oxidation Resistance: Stable up to 580°C (1,076°F) in steam environments.
(3) Key Applications
- Boiler Tubes: Superheaters, reheater tubes.
- Heat Exchangers: Refineries, power plants.
- Pressure Vessels: ASME SA-199 T22 for seamless pipes.
2. Fin Design
Fin Type: Serrated Fins
- Structure: Fins are cut into discontinuous segments (serrations) to disrupt boundary layers, enhancing heat transfer by 20-30% compared to smooth fins.
- Material: Carbon steel fins (typically ASTM A179 or A192 for compatibility with the base tube).
Key Benefits:
- Turbulence generation for improved heat exchange.
- Reduced fouling in dirty gas/fluid environments.
3. Comparison to Alternatives
| Feature | ASTM A213 T22 HFW Serrated Finned Tube | Smooth-Finned Tube | Extruded Finned Tube |
| Heat Transfer | Highest (serrations create turbulence) | Moderate | High (but no serrations) |
| Cost | Mid-range (HFW + carbon steel fins) | Lowest | Highest (extrusion process) |
| Durability | Excellent (T22 + welded fins) | Good | Excellent (monolithic) |
4. Key Considerations for Buyers
Fin Density: Typically 5-11 fins per inch (FPI), depending on gas flow requirements.
Corrosion Protection: Optional aluminization or ceramic coating for harsh environments.
Customization: Fin height, thickness, and serration pattern can be tailored
The ASTM A213 T22 HFW Serrated Finned Tube with Carbon Steel Fins is a high-performance heat transfer component designed for demanding industrial applications. Here’s a detailed breakdown of its key applications and advantages:
1.Primary Applications
A. Power Generation
- Boilers & Superheaters:
- Used in coal-fired, gas-fired, and biomass power plants to enhance heat recovery from flue gases.
- Why T22? The 2.25% Cr-1% Mo alloy resists oxidation and creep at temperatures up to 580°C (1,076°F).
- Economizers:
- Preheats feedwater by recovering waste heat from exhaust gases, improving plant efficiency.
B. Oil & Gas/Petrochemical
- Waste Heat Boilers:
- Recovers energy from process gases (e.g., refinery catalytic crackers).
- Fired Heaters:
- Serrated fins disrupt boundary layers, reducing fouling in hydrocarbon processing.
C. Industrial Heat Exchangers
- Air Preheaters:
- Preheats combustion air using exhaust gases (common in cement/steel plants).
- Process Heaters:
- Transfers heat in chemical reactors or distillation columns.
D. HVAC & Energy Recovery
- Heat Recovery Steam Generators (HRSGs):
- Captures heat from gas turbine exhaust to produce steam.
2. Why Choose This Combination?
| Feature | Benefit |
| ASTM A213 T22 Base Tube | High-temperature strength, corrosion resistance, and weldability. |
| HFW (High-Frequency Welded) | Cost-effective for mass production; weld integrity comparable to seamless. |
| Serrated Carbon Steel Fins | 20–30% higher heat transfer vs. smooth fins; resistant to thermal fatigue. |
| Carbon Steel Fins | Economical, compatible with T22 base metal, and easily weldable. |
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