ASTM A213 TP347H Alloy-Steel Solid Fin Tube For Boiler
Helical solid fin tubes, also known as high frequency welding fin tubes, are manufactured using a specialized process that utilizes high-frequency electrical currents to fuse metal edges without additional filler materials.
ASTM A213 TP347H (UNS S34709) are seamless austenitic steel tubes designed for applications in boilers, superheaters, and heat exchangers. Grades designated with 'H' provide superior creep-rupture strength at elevated temperatures.
| Grade | C | Mn | P | S | Si | Cr | Ni | Nb |
|---|---|---|---|---|---|---|---|---|
| TP347H | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0-19.0 | 9.0-13.0 | 8×C-1.10 |
| Grade | Tensile Strength (min) | Yield Strength (0.2% Offset, min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| TP347H | 75ksi (515 MPa) | 30ksi (205 MPa) | 35% | 192 HBW / 200HV / 90 HRB |
- Increased heat exchange area reduces heat transfer and metal flow
- Excellent corrosion resistance, wear resistance, and thermal stability
- Low contact thermal resistance with anti-ash capability
- Reduces required installation space while maintaining high reliability
- Enhanced stiffness and seismic performance
Ideal for power stations and high-temperature equipment in the oil industry, including:
- Boilers and Steam Generators
- Heat Exchangers and Furnaces
- Economizers and Combustion Heaters
- Large Air Coolers
- Drier Heaters
| Type | Description | Base tube O.D. (mm) | Fin pitch (mm) | Fin height (mm) | Fin thickness (mm) |
|---|---|---|---|---|---|
| Embedded | G-type fin tube | 16-63 | 2.1~5 | <17 | ~0.4 |
| Extruded | Single metal / Combined metal | 8-51 | 1.6~10 | <17 | 0.2-0.4 |
| Low fin tube | T-type fin tube | 10-38 | 0.6~2 | <1.6 | ~0.3 |
| Bamboo tube | Corrugated tube | 16-51 | 8.0~30 | <2.5 | ~0.3 |
| Wound | L / KL / LL type fin tube | 16-63 | 2.1~5 | <17 | ~0.4 |
| String | String fin tube | 25-38 | 2.1-3.5 | <20 | 0.2-0.5 |
| U-type | U-type fin tube | 16-38 | / | / | / |
| Welding | HF-welding fin tube | 16-219 | 3~25 | 5~30 | 0.8-3 |
| H/HH type | H/HH type fin tube | 25-63 | 8~30 | <200 | 1.5-3.5 |
| Studed | Studed fin tube | 25-219 | 8~30 | 5~35 | φ5-20 |
As a leading Chinese manufacturer of fin tubes, we have extensive project experience in heat exchanger and boiler systems, marine applications, and oil & gas projects. Our products are exported to over 80 countries worldwide, supported by advanced production equipment and skilled technical staff.
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