High Frequency Welded Finned Tubes TP347H Base Tube & CS Fins for Boilers & Heaters
HFW Finned Tubes: TP347H Base with Carbon Steel Fins
Engineered for extreme thermal efficiency in corrosive environments, YUHONG HFW finned tubes combine TP347H austenitic stainless steel base tubes with carbon steel (CS) fins via precision high-frequency resistance welding. This hybrid construction delivers superior oxidation resistance at elevated temperatures (TP347H) and cost-effective heat transfer enhancement (CS fins), ideal for high-pressure boilers, HRSGs, and sulfur recovery units.
Advanced Material Synergy
| Component | Material Grade | Key Properties |
|---|---|---|
| Base Tube | ASTM A376 TP347H | 18% Cr-10% Ni-Nb stabilized, exceptional creep strength (≤815°C), resists intergranular corrosion & oxidation |
| Fins | Carbon Steel | High thermal conductivity (50 W/m·K), economical scaling solution for non-corrosive zones |
Base Tube Parameters (TP347H)
| Parameter | Specification |
|---|---|
| OD Range | 16-219 mm |
| Wall Thickness | 2.0 - 6.55 mm |
| Max Temp | 815°C (Continuous) |
| Corrosion Resistance | Excellent in H₂S, SO₃, NaOH environments |
Finned Product Dimensions
| Feature | Range | Tolerance |
|---|---|---|
| Fin Height | 5-30 mm | ±0.5 mm |
| Fins per inch | 4-35 | ±0.2 |
| Fin Strip Thickness | 0.8-3 mm | ±0.1 mm |
| Max Length | 20-30 meters | Straightness ≤1/1000 |
Key Advantages of HFW Finned Tubes
- Superior Bond Strength & Integrity: The metallurgical fusion weld creates a joint stronger than the fin material itself. This bond is highly resistant to thermal cycling, vibration, and corrosion penetration.
- Excellent Heat Transfer Efficiency: The direct, continuous metal-to-metal bond offers minimal thermal contact resistance ("zero resistance" ideally), maximizing heat transfer rates compared to mechanical attachments (L-foot, embedded) or lower integrity bonds.
- Outstanding Durability & Long Life: The robust weld resists fin loosening or detachment even under harsh operating conditions (high temperature, thermal shock, erosion, cleaning). Reduces maintenance costs.
- Optimized for High Temperatures: The solid-state weld maintains integrity at elevated temperatures where soldered or brazed joints might fail.
- High Fin Density Possible: Allows for closer fin spacing (more fins per unit length) than many mechanical methods, significantly increasing heat transfer surface area in a compact space.
- Material Flexibility: Suitable for various base tube (steel, stainless, alloy) and fin (Aluminum, Carbon Steel, SS, Copper) combinations based on application needs. Ideal for Al fins on steel tubes.
- Low Contact Resistance: Virtually eliminates the thermal barrier present in mechanically bonded fins, enhancing overall efficiency.
- Good Cleanability: The smooth, continuous weld area minimizes crevices where fouling can accumulate, facilitating easier cleaning.
Target Applications:
- HRSG Economizers: TP347H resists dew-point corrosion from flue gas condensate
- Sulfuric Acid Coolers: Nb stabilization prevents sensitization in 400-600°C zones
- Coker Charge Heaters: CS fins withstand erosion from catalyst particles
- Biomass Boilers: TP347H base withstands chloride stress corrosion cracking (Cl-SCC)
Why Our TP347H/CS Finned Tubes?
✓ 30% Longer Service Life vs. 304H/CS composites in cyclic thermal service
✓ Zero Bond Degradation at thermal differentials ≤260°C (fin-to-tube)
✓ Custom Metallurgical Solutions: Post-weld solution annealing available
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