High Frequency Welding ASTM A106 Gr. B Finned Tubes For Power Generation Industry
High-frequency welding (HFW) finned tubes are recognized for their robust structure and outstanding thermal performance in various industrial applications. They are an advanced heat transfer component designed to enhance heat exchange efficiency by significantly increasing the surface area of the tubes.
The choice of materials for HFW finned tubes depends on the specific application's operating temperature, pressure, and fluid type. Generally tube materials are carbon steel: ASTM A106 GR.B, ASTM A210, ASTM A192,etc; stainless steel:AISI 304, 316, 321, 347, TP30 4/304L, TP316/TP316L, TP321, TP310S, TP317,etc; alloy steel: T/P5, 9, 11, 22, 91, and ASTM A335 P9,etc. Fin materials generally are carbon steel, stainless steel and alloy steel, etc.
Detailes of ASME SA106 Base Tubes
ASME SA106 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) |
Key Characteristics of HFW Finned Tubes
1.High Heat Transfer Efficiency.
2.Strong Fin to Tube Bond: Even under high-temperature and high-pressure operating conditions, this bond ensures excellent thermal contact and mechanical strength.
3.Mechanical Resistance and Durability.
4.Corrosion Resistance: Depending on the materials chosen, HFW finned tubes can be resistant to corrosion.
5.Low Contact Thermal Resistance & High Stability.
6.Compact Design and Anti-fouling Ability.
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 |
Primary Applications of Finned Tubes
Power Generation: Essential components in boiler economizers, air preheaters, and condensers.
Petrochemical Industry: Used extensively in process heaters, reformers, air coolers, and heat exchangers for various processes.
HVAC (Heating, Ventilation, and Air Conditioning): Employed in industrial heat exchangers to facilitate efficient heating or cooling.
Waste Heat Recovery: A key application, HFW finned tubes are used to recover waste heat from high-temperature exhaust gases, hot water, or steam in industries such as power, metallurgy, and cement.
Other Industries: Equipment like radiators and dryers, etc.
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