ASTM A312 A376 TP347H 18Cr-10Ni-Nb Solid Finned Pipe for Fired Heater API Standard 560
Yuhong Holding Group Co., Ltd is a globally recognized manufacturer and supplier of industrial equipment, specializing in heat exchangers, fired heaters, air coolers, and related components. With a production capacity exceeding 6000 tons annually, we are committed to delivering high-quality solutions for diverse industries. Among our flagship products is the TP347H 18Cr-10Ni-Nb Austenitic Stainless Steel Fin Pipe, specifically designed for the convection section of fired heaters in compliance with API 560 standards.
1. 18Cr-10Ni-Nb (TP347H) Chemical Composition and Mechanical Properties
TP347H is an austenitic stainless steel stabilized with niobium (Nb), making it highly resistant to sensitization and intergranular corrosion. It is widely used in high-temperature applications due to its excellent creep strength and oxidation resistance.
Chemical Composition of TP347H (18Cr-10Ni-Nb)
| Element | Composition (%) |
| Carbon (C) | 0.04–0.10 |
| Chromium (Cr) | 17.0–19.0 |
| Nickel (Ni) | 9.0–13.0 |
| Niobium (Nb) | 8 × C min, ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 0.75 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Nitrogen (N) | ≤ 0.10 |
Mechanical Properties of TP347H
| Property | Value |
| Tensile Strength | ≥ 515 MPa (74,700 psi) |
| Yield Strength | ≥ 205 MPa (29,700 psi) |
| Elongation | ≥ 35% |
| Maximum Operating Temperature | 650°C (1202°F) |
2. Function of Fin Pipes in the Convection Section of Fired Heaters
In fired heaters, the convection section plays a critical role in improving thermal efficiency by recovering heat from flue gases. TP347H HFW fin pipes are ideal for this application due to their excellent high-temperature and corrosion resistance. The fins enhance the heat transfer surface area, allowing for efficient heat exchange between the flue gases and the fluid inside the tubes.
Key benefits of using TP347H fin pipes in the convection section include:
- High Efficiency: Improved heat transfer performance through the extended surface area.
- Durability: Resistance to oxidation and carburization at high temperatures.
- Stability: Niobium stabilization minimizes intergranular corrosion and extends service life.
3. Common Fin Pipe Parameters
High-frequency welded (HFW) fin tubes are manufactured with precise specifications to meet the demands of fired heater applications. Below is a summary of typical parameters for TP347H fin tubes:
| Parameter | Specification |
| Base Tube Material | TP347H Austenitic Stainless Steel |
| Fin Material | Stainless Steel (TP304, TP316, TP347H) |
| Fin Height | 10–15 mm |
| Fin Thickness | 0.8–1.5 mm |
| Fin Pitch | 8–12 fins per inch |
| Manufacturing Type | High-Frequency Welding (HFW) |
| Operating Temperature | Up to 650°C (1202°F) |
4. Applications of TP347H Fin Pipes
TP347H fin pipes/tubes are highly versatile and used in various high-temperature industrial applications, including:
- Fired Heaters: Particularly in the convection section for efficient heat recovery.
- Heat Exchangers: For extreme temperature and corrosive environments in refineries and petrochemical plants.
- Boilers: In superheaters and reheaters to handle high-temperature steam conditions.
- Air Coolers: In high-temperature air cooling systems.
- Power Plants: For heat recovery in combined cycle and fossil fuel plants.
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ASTM A312 A376 TP347H 18Cr-10Ni-Nb Solid Finned Pipe for Fired Heater API Standard 560 Images
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