Spiral Fin Tube
High-Frequency Welded Spiral Finned Tubes
AGICO is a HFW spiral finned tubes supplier in China, we supply various HFW finned tubes for heat exchanger manufacture in the power, metallurgical, and cement industries.
HFW Welded Finned Tubes Supply
- High-frequency-welded spiral finned tubes can be manufactured to meet users’ specific requirements. The steel tube diameters commonly used for such finned tubes are 1 inch, 1.5 inches, 2 inches, etc., and the length can be customized from 1 to 8 meters.
- HFW finned tubes are coated with anti-rust paint and silver powder to prevent corrosion, offering excellent anti-corrosion performance. They are suitable for various heating systems such as steam, hot water, and thermal oil.
| Tube OD mm | Tube WT mm | Fin Tube Length m | Fin Height mm | Fin Thickness mm | Fin Pitch mm | Fin Slid Width mm |
|---|---|---|---|---|---|---|
| OD 16~273 | 1.65~30 | up to 30 | 5~60 | 0.5~3 | 2.5~50 | 4.0~7.9 |
HFW Finned Tubes Specifications
Base Tube Details
- Base Tube Material: The base tube can be manufactured from carbon steel, stainless steel, or corrosion-resistant steel.
- Base Tube Types: seamless steel pipes, high-frequency electric resistance welded (ERW) steel pipes.
- Outer Diameter: 25–159 mm
- Wall Thickness: 2–8 mm;
- Max Length: up to 10,000 mm.
Fin Size and Details
- Fin Materials: Weldable fin materials include carbon steel, corrosion-resistant steel, stainless steel, and alloy steel.
- Fin Thickness: 0.8–2 mm;
- Fin Height: 10–30 mm, generally not exceeding the radius of the base tube;
- Fin Pitch: 5–20 mm.
HFW Spiral Finned Tubes Introduction
- Welding Method: We perform the 2 types of welding processes: high-frequency resistance welding and high-frequency induction welding. The former is suitable for large-diameter pipes, while the latter is often used for small-diameter thin-walled tubes. High-frequency welded spiral finned tubes can also be classified into non-serrated (unslotted) and serrated (slotted) types according to the fin form.
- Solid-phase Welding: This high-frequency welding is essentially a solid-phase welding process. Compared with methods such as embedded fin tube brazing (or overall hot-dip galvanizing), high-frequency welding offers advantages in product quality (fin weld bonding ratio of 95%), productivity, automation level, and also reasonable pricing of the finned tubes.
- Application in Heat Exchangers
HFW finned tubes are the key part of heat exchangers; they are used for manufacturing air preheaters and energy-saving radiators for factories and residential buildings. They can also be used for post-fabrication fin winding on heat pipes, boiler economizers, waste heat recovery boilers in power stations, greenhouse heating, petrochemical engineering, printing and dyeing, and various types of heat exchangers.
HFW Spiral Finned Tube Manufacturing Process
The manufacturing process of the HFW spiral finned tube involves 2 steps—heating and pressure welding. Utilizing the skin effect of high-frequency current (150–450 kHz), the contact surface between the base tube and the steel strip is instantly heated to a plastic state (800–1000°C). Then, pressure is applied by squeeze rollers, causing the two materials to solid-state fuse into one integral piece.
Fabrication Standard: The HFW finned tubes are manufactured in compliance with the requirements of HG/T 3181 and JB/T 6512 technical specifications and can also be customized according to the customer’s requirements.
- Advantages of High-Frequency Welded Finned Tubes
Compared with extruded finned tubes, HFW spiral finned tubes offer high weld strength, high thermal conductivity, and strong corrosion resistance. Furthermore, the production process features a high degree of automation and high productivity, with no need for any additional welding materials, reducing the manufacturing costs. - Connection Design
High-frequency welded finned tubes are high-efficiency heat-dissipating elements developed to overcome the drawbacks of plate-fin and wound-fin type finned tube radiators. They are important components in equipment such as air conditioners and radiators. After fabrication, multiple finned tubes need to be assembled and connected according to actual application requirements. There are two common connection methods: flange connection and bent-tube (elbow) connection.
HFW Finned Tube Material – Steel Tube Types
AGICO supplies HFW finned tubes of various base tube materials: carbon steel tube, alloy steel tube, stainless steel tube and nickel-based infiltration-brazed tubes.
Nickel-Based Infiltration-Brazed Finned Tubes
The weld rate between the base tube and the fins is 100%, resulting in zero contact thermal resistance. The welded areas are smooth, and the nickel infiltration layer is uniform, dense, and hard, with no possibility of peeling or falling off. These tubes offer high resistance to high- and low-temperature dew-point corrosion, as well as to erosion and wear. They are not prone to dust accumulation or scaling and can be used for long periods in corrosive atmospheres containing acids, alkalis, salts, and other aggressive media.
Stainless Steel Finned Tubes
Manufactured using nickel-based brazing or high-frequency welding technology, these tubes achieve a 100% weld rate between the tube and fins, with near-zero contact thermal resistance. They can operate at working temperatures of up to 800°C and are suitable for environments with high temperatures, high flow velocities, and corrosive media.
AGICO shows you a detailed table of available common steel tube types and grades used as the base tubes below. If you have any questions of finned tubes, send us a message!
| Material Category | Tube Material Specifications |
|---|---|
| Carbon Steel Tubes | ASTM A179; ASTM A192; ASTM A210 Grade A1; ASTM A210 Grade C; ASTM A106 Grade B |
| Alloy Steel Tubes | ASTM A209 T1; ASTM A213 / ASTM A199 T11 / T12; ASTM A213 / ASTM A199 T22; ASTM A213 / ASTM A199 T5; ASTM A213 / ASTM A199 T9; ASTM A335 P1 / ASTM A161 T1; ASTM A335 P11 / P12 / ASTM A200 T11 / T22; ASTM A335 P22 / ASTM A200 T22; ASTM A335 P5 / ASTM A200 T5; ASTM A335 P9 / ASTM A200 T9 |
| Stainless Steel Tubes | ASTM A213 / ASTM A312 TP304; ASTM A213 / ASTM A312 TP304L; ASTM A213 / ASTM A312 TP321; ASTM A213 / ASTM A312 TP316; ASTM A213 / ASTM A312 TP316L; ASTM A213 / ASTM A312 TP347; ASTM A213 / ASTM A312 TP316Ti; ASTM A789 / ASTM A790 UNS S31803; ASTM B677 Alloy 904L |
| Nickel Alloy Tubes | ASTM B161 Ni 200; ASTM B161 Ni 201 |
