ASTM A376 TP347H HFW Finned Tubes For Process Gas Heater And Process Gas Cooler
Process Gas Heaters and Process Gas Coolers are critical unit operations in chemical, petrochemical, and refining processes, designed to precisely control the temperature of gaseous process streams.
A Process Gas Heater is a thermal device that transfers energy to a gaseous process stream, increasing its temperature.Common types: Fired Heaters(Furnaces); Heat Exchanger-Type Heaters; Electric Heaters.
A Process Gas Cooler is a thermal device that removes energy from a gaseous process stream, decreasing its temperature.Common types:Air-Cooled Heat Exchangers (Fin-Fan Coolers);Shell and Tube Heat Exchangers;Direct Contact Coolers.
In both heaters and coolers, HFW finned tubes are a preferred choice for the heat transfer surface.The fins, welded onto the external surface of the base tube (which can be made to standards like ASTM A376, A335,etc. for high-temperature service), dramatically increase the surface area for heat transfer to or from the air or utility fluid. This results in a more compact, efficient, and cost-effective design.
ASTM A376 This specification covers seamless austenitic steel pipe intended for high-temperature central-station service. Among the grades covered are five H grades and two nitrogen grades (304N and 316N) that are specifically intended for high-temperature service.
Chemical Composition (%) max S34709
| Grade | C | Mn | P | S | Si | Cr | Ni |
| TP347H | 0.04-0.10 | 2.00 | 0.045 | 0.03 | 0.75 | 17.0-19.0 | 9.0-13.0 |
| The columbium content shall be not less than eight times the carbon content and not more than 1.10% |
Mechanical Properties S34709
| Grade | Tensile Strength,min | Yield Strength (0.2%Offset,min) |
| TP347H | 75ksi (515 MPa) | 30ksi (205 MPa) |
The core value of ASTM A376 TP347H pipe material lies in its high-temperature performance:
1.Excellent intergranular corrosion resistance: Due to the addition of stabilizing element niobium, it can resist corrosion caused by the precipitation of chromium carbide in the sensitive temperature range (approximately 450 - 850°C). This makes it less prone to intergranular corrosion after welding or during long-term operation at this temperature range.
2.Excellent high-temperature strength and creep strength: The "H" grade ensures that the material has stronger resistance to deformation (creep) and fracture under long-term high-temperature and high-pressure conditions (typically above 525°C).
3.Good oxidation resistance and Material stability: It can form a stable chromium oxide protective layer at high temperatures, resisting oxidation by smoke and air.And when exposed to high temperatures for a long time, its microstructure remains stable and does not tend to become brittle.
Due to these properties, ASTM A376 seamless austenitic steel pipe intended for high-temperature central-station service,commonly used in boilers, heat exchangers, and other high-temperature applications.
Summary
ASTM A376 HFW finned tubes represent the high-end category among finned tube products. It is not designed for ordinary working conditions, but exists specifically to solve heat exchange problems under extreme conditions such as high temperature, high pressure and strong corrosion.
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