U Bend HFW Fin Tubes ASTM A106 Gr B Carbon Steel Tubos Aletados For Economizers
U Bend HFW Fin Tubes ASTM A106 Gr. B Carbon Steel Tubos Aletados For Economizers
U bend tubes usually used to exchange heat in process fluids in large radiators.The fluid is pumped out through a U-Junction, and then flows back along a pipe parallel to the inflow line.High frequency welding fin tubes are specialized tubes that are manufactured using a high frequency welding process. This technique involves using high-frequency electrical currents to heat the edges of the metal, allowing them to be fused together. U bend fin tube is bent on the basis of the straight forming of the fin tube.What's more, there is another way to make it, consisting of 180° U bend elbows and 2 straight finished finned tubes, fused together by welding.
The general materials of base tubes and of fins about the HF welding finned tube are carbon steel, alloy, stainless steel, etc.
Detailes of Base Tubes
ASTM A106 This specification covers seamless carbon steel pipe for high-temperature service (Note 1) in NPS 1 ⁄ 8 to NPS 48 [DN 6 to DN 1200] (Note 2) inclusive, with nominal (average) wall thickness as given in ASME B36.10M.
Chemical Composition (%)
| Grade | C | Mn | P | S | Si | Cr | Cu | Mo | Ni | V |
| Gr. B | 0.30 | 0.29-1.06 | 0.035 | 0.035 | 0.10 | 0.40 | 0.40 | 0.15 | 0.40 | 0.08 |
Mechanical Properties
| Grade | Tensile Strength,min | Yield Strength (0.2%Offset,min) |
| Gr.B | 60ksi (415 MPa) | 35ksi (240 MPa) |
Advantages
Due to the high welding speed and strong self cooling effect, the heat affected zone is small and oxidation is not easy to occur. Therefore, the microstructure and properties of the weld are very good.
The heat exchange area is large, reduce heat transfer and metal flow;reduce the installation space of the required heat transfer surface and at the same time, it has high reliability.
Corrosion resistance, wear resistance, low contact thermal resistance, high stability, anti ash ability.
The pressure drop on the tube side is reduced and the operation cost is reduced;he stiffness and seismic performance of steel pipe are improved.
Application
Economizers
Furnaces
Heater of Driers
Combustion Heater
Condensers
Evaporators
Steam Coils
Heat Exchanger
Waste Heat Recovery
Air Coolers / Oil Coolers / Hydrogen Coolers / Generator Coolers,etc.
Specifications For Various Types Of Finned Tubes
| Type | Description | Base tube | Fin specification (mm) | ||
| O.D. (mm) | Fin pitch | Fin height | Fin thick | ||
| 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 fin tube | 25-63 | 8~30 | <200 | 1.5-3.5 | |
| Studed fin tube | 25-219 | 8~30 | 5~35 | φ5-20 | |
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