ASTM A213 TP316 Serrated Spiral HFW Finned Tube With Stainless Steel Fins For Heaters
A serrated finned tube is a type of heat exchanger tube designed to improve heat transfer between fluids by increasing the surface area available for heat exchange and inducing turbulence. These tubes have fins attached to their outer surfaces, which are then cut or serrated along their height to form a series of gaps or openings.
ASTM A213 TP316 Serrated Spiral HFW Finned Tube with Stainless Steel Fins is a specialized heat exchanger component designed for high-efficiency thermal transfer in demanding environments. Here's a detailed breakdown:
-ASTM A213 TP316
- Material Standard: ASTM A213 covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes.
- TP316: This is a grade 316 stainless steel (austenitic), offering excellent corrosion resistance, high-temperature strength, and good formability/weldability. It contains molybdenum, enhancing resistance to chlorides and acidic environments.
-Serrated Spiral Fins
- Spiral Design: The fins are helically wound around the tube for increased surface area, improving heat transfer efficiency.
- Serrated Edge: The fins have notched or serrated edges, which disrupt laminar flow and enhance turbulence, further boosting heat exchange.
-HFW (High-Frequency Welding)
- Manufacturing Process: The fins are welded to the tube using high-frequency induction welding, ensuring a strong, metallurgically bonded joint with minimal thermal distortion.
-Stainless Steel Fins
- Material Compatibility: The fins are also made of stainless steel (often matching the tube grade, e.g., SS316), ensuring uniform corrosion resistance and thermal expansion properties.
-Key Feature:
- High Heat Transfer Efficiency: Ideal for boilers, economizers, air heaters, and process gas heaters.
- Corrosion Resistance: Suitable for harsh environments (chemical plants, marine, oil & gas).
- Durability: Resists oxidation and mechanical stress at elevated temperatures.
Here are the chemical composition and mechanical properties of ASME SA213 TP316 (equivalent to ASTM A213 TP316) in a clear tabular format:
-Chemical Composition (Weight %)
| Element | SA213 TP316 Requirements | Typical Values |
| Carbon (C) | ≤ 0.08% | 0.04–0.08% |
| Manganese (Mn) | ≤ 2.00% | 1.00–2.00% |
| Phosphorus (P) | ≤ 0.045% | ≤ 0.030% |
| Sulfur (S) | ≤ 0.030% | ≤ 0.020% |
| Silicon (Si) | ≤ 1.00% | 0.30–0.70% |
| Chromium (Cr) | 16.0–18.0% | 16.5–17.5% |
| Nickel (Ni) | 10.0–14.0% | 10.5–13.5% |
| Molybdenum (Mo) | 2.00–3.00% | 2.10–2.60% |
| Nitrogen (N) | — | ≤ 0.10% (optional) |
Notes:
TP316L (low carbon variant) has C ≤ 0.035% for improved weldability.
Iron (Fe) makes up the remainder.
-Mechanical Properties
| Property | SA213 TP316 Requirements | Typical Values |
| Tensile Strength (MPa) | ≥ 485 | 515–620 |
| Yield Strength (MPa) | ≥ 170 | 205–310 |
| Elongation (% in 50mm) | ≥ 35 | 40–50 |
| Hardness (Rockwell B) | ≤ 90 HRB | 70–85 HRB |
Additional Notes:
Temperature Limits: TP316 performs well up to 870°C (1600°F) intermittently and 925°C (1700°F) for short-term service.
Corrosion Resistance: Excellent against acids, chlorides, and sulfides due to Mo content.
-Key Differences Between TP316 and TP316L
| Parameter | TP316 | TP316L (Low Carbon) |
| Carbon Content | ≤ 0.08% | ≤ 0.035% |
| Weldability | Good | Excellent (resists sensitization) |
| High-Temp Use | Better strength | Lower carbide precipitation |
The ASTM A213 TP316 Serrated Spiral HFW (High-Frequency Welded) Finned Tube with Stainless Steel Fins is designed for high-performance heat transfer in demanding industrial environments. Its corrosion resistance, high-temperature strength, and enhanced heat exchange efficiency make it suitable for the following applications:
1. Power Generation
- Boilers & Superheaters: Efficient steam generation in coal-fired, biomass, and waste-to-energy plants.
- Heat Recovery Steam Generators (HRSG): Recovers waste heat from gas turbines.
- Economizers: Preheats feedwater using flue gas waste heat.
2. Petrochemical & Oil Refining
- Process Gas Heaters: Heats corrosive gases (e.g., hydrogen sulfide, chlorine) in refineries.
- Catalytic Reformers: High-temperature hydrocarbon processing.
- Crude Oil Heaters: Resists sulfur-containing acidic environments.
3. Chemical & Pharmaceutical Industries
- Acid/Caustic Heat Exchangers: Handles sulfuric, nitric, and phosphoric acids.
- Condensers & Evaporators: For aggressive chemical processes.
4. Marine & Offshore
- Desalination Plants: Resists saltwater corrosion in multi-stage flash (MSF) or MED systems.
- Shipboard Heat Exchangers: Engine cooling, exhaust gas boilers.
5. HVAC & Industrial Heating
- Air Preheaters: Recovers heat from exhaust gases in industrial furnaces.
- Drying Systems: For food, paper, or textile industries.
6. Waste Incineration & Environmental Systems
- Flue Gas Cooling: Withstands corrosive byproducts (e.g., HCl, SO₂) in waste incinerators.
- SCR (Selective Catalytic Reduction) Systems: Preheats gases for NOx reduction.
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