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| Brand Name: | Yuhong |
| Model Number: | ASTM A312 TP347H |
| MOQ: | 100 KGS |
| Price: | Negotiable |
| Payment Terms: | L/C,T/T |
| Supply Ability: | 1000 ton per ton |
ASTM A312 TP347H is a high-temperature, stabilized austenitic stainless steel with added columbium (niobium) for improved creep strength. When made into Serrated Fin Tubes using High-Frequency Welding (HFW), this tube becomes ideal for furnace convection sections, offering enhanced heat transfer efficiency and extended service life under cyclic thermal stress and oxidizing conditions.
| Element | Content (%) |
|---|---|
| C | 0.04 – 0.10 |
| Mn | ≤ 2.00 |
| P | ≤ 0.040 |
| S | ≤ 0.030 |
| Si | ≤ 1.00 |
| Cr | 17.0 – 19.0 |
| Ni | 9.0 – 13.0 |
| Nb (Cb) | 10 × C min |
| Fe | Balance |
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness (HBW) | ≤ 192 HB |
| Max. Working Temp | ~ 1050°C (1922°F) |
High Temperature Resistance
Ideal for superheaters, heaters, and furnaces, TP347H withstands long-term service at elevated temperatures without creep deformation.
Improved Heat Transfer Efficiency
The serrated fin design increases turbulence and surface area, boosting heat transfer while minimizing fouling.
Oxidation & Corrosion Resistance
Excellent performance in oxidizing atmospheres, especially in fuel-fired furnaces.
Creep-Strength Enhanced
Addition of niobium enhances structural stability under high stress and thermal cycling.
Weldability and Fabrication
Good weldability with standard procedures; suitable for custom-designed fin configurations.
The Serrated Fin Tube made of ASTM A312 TP347H is specifically used in:
Convection Section of Furnaces
Absorbs radiant heat and transfers it efficiently to the working fluid (steam, oil, or gas).
Heater Banks & Superheaters
Installed where both thermal efficiency and material durability are critical.
Refinery Fired Heaters
In hydrocarbon processing, TP347H fin tubes are used in crude, reformer, and hydrotreater furnaces.
