Helical Finned Tube

Our Helical Finned Tube utilizes high-frequency welding technology, continuously welding stainless steel fins to a stainless steel base tube using high-frequency resistance welding, ensuring a strong bond between the fins and the base tube. This process not only boasts high production efficiency but also enhances heat transfer efficiency, making it ideal for applications such as boilers, air coolers, and waste heat recovery systems in industries like power generation and petrochemicals.
Tube Outer Diameter: 10–200 mm (customizable)
Tube Wall Thickness: 1–10 mm(customizable)
Fin Height: 6–50 mm
Fin Pitch: as customer's request
Tube Length: Can be customized upon request
Standard: ASME SA213，or customer-specified standards

Products Description

Our Advantages

1. Advanced High-Frequency Welding Technology

We possess advanced production equipment, including automated spiral fin processing machines and 22 cold-drawing lines, ensuring quality and dimensional control of steel pipes in mass production. This guarantees uniform adhesion between the fins and the pipe surface, eliminating gaps or weak points.

2. Customizable
Our fin height, fin spacing, pipe diameter, and pipe length can all be customized to customer specifications. We offer a variety of stainless steel materials, including 304, 304L, 316, 316L, 321, and 347. Pipes can be customized according to customer drawings.

3. High Heat Transfer Efficiency
The spiral fins increase the surface area of the pipe, thereby improving heat transfer efficiency. Our pipes undergo pickling treatment to ensure a smooth inner bore and uniform liquid flow rate within the pipe.

4. Low Maintenance Costs
Our Helical Finned Tube uses high-frequency current welding to the base pipe and undergoes non-destructive testing to ensure a tight bond between the fins and the base pipe, reducing mechanical failures and scaling.

5. Surface Quality

Our high-frequency welded helical finned tubes undergo pickling, passivation, and polishing to achieve a smooth surface, reducing the risk of fin detachment. For customers with specific needs in chemical, pharmaceutical, and other applications, electropolishing is available.

application areas

Power Generation: Superheaters and reheater tubes, air preheaters, etc., used in coal-fired, gas-fired, and biomass power plants.
Petrochemical Industry: Heat exchangers, condensers, and evaporators.
HVAC & Refrigeration: Air coolers and condensers.
Marine and Offshore: Seawater heat exchangers, seawater desalination plants, etc.

Chemical Composition

Element	C	Cr	Ni	Mn	Si	P	S
304	≤0.08	18–20	8–10.5	≤2	≤1	≤0.045	≤0.03
304L	≤0.03	18–20	8–12	≤2	≤1	≤0.045	≤0.03
316	≤0.08	16–18	10–14	≤2	≤1	≤0.045	≤0.03
316L	≤0.03	16–18	10–14	≤2	≤1	≤0.045	≤0.03

Mechanical Properties

Property	Tensile Strength (MPa)	Yield Strength 0.2% (MPa)	Elongation (%)	Hardness (HB)
304	520–750	205–310	≥40	≤187
304L	485–690	170–275	≥40	≤187
316	520–750	205–310	≥40	≤187
316L	485–690	170–275	≥40	≤187

Possible Alternative Grades

Alternative Grades	Reasons
321	Suitable for high-temperature applications requiring titanium stabilization.
347	Suitable for applications with extremely high resistance to intergranular corrosion.
Duplex 2205	Suitable for marine or highly corrosive environments requiring higher strength and chloride resistance.