High Frequency Resistance Welded Finned Tubes Manufacturer & Supplier in India
High Frequency Resistance Welded Finned Tubes are specially designed for efficient heat transfer applications for air cooled heat exchanger applications, economizers in boilers, WHR and HRSG systems. An extended fin strip of solid or serrated pattern is helically wrapped around the base tube and joined by high frequency resistance welding. Typical finning ranges are 6.35–38 mm fin height, 0.8–3.0 mm fin thickness for carbon-steel fins (1.0–2.5 mm for stainless/alloy where applicable), and 43–287 fins per metre; final values are confirmed to the project specification. The base tubes are available in carbon steel, stainless steel, and alloy steel, depending upon the requirement of applications. These products can be customized as per customer’s requirement. Amardeep Steel provides high quality HF welded finned tubes and other materials all across India.
Technical Data
Specifications of High Frequency Resistance Welded Finned Tubes
| Technical Parameter | Manufacturing Capabilities & Range |
|---|---|
Fin Types / Profiles |
Solid (Continuous Helical) & Serrated (Segmented) |
Base Tube Outside Diameter (OD) |
26.0 mm to 168.3 mm (1.0" to 6.625" OD) |
Base Tube Wall Thickness (WT) |
Minimum 2.0 mm up to 12.7 mm (Schedule-specific) |
Fin Thickness Range |
Carbon Steel: 0.8 mm to 3.0 mm |
Fin Height Range |
6.35 mm (0.25") minimum up to 38.0 mm (1.50") maximum |
Fin Density / Pitch |
43 to 287 fins per meter (approx. 1 to 7 fins per inch) |
Base Tube Materials |
Carbon Steel: ASME SA179, SA192, SA210 Gr. A1/C, SA209 |
Fin Material Range |
Carbon Steel, Stainless Steel (304, 316, 409, 410, 321), Alloy Steel |
Applicable Design & Quality Standards |
Base Tube Codes: ASME Boiler & Pressure Vessel Code (BPVC) Section II, ASTM A179 / A213 / A312 |
Chemical Compositions of High Frequency Resistance Welded Finned Tubes
| Material Grade & Description | Governing Standard | UNS Designation | Carbon (C) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Other Key Elements |
|---|---|---|---|---|---|---|---|
Carbon Steel (Seamless/Welded) |
ASTM A179 / A214 |
K01200 / K01807 |
0.06 – 0.18% |
— |
— |
— |
Mn: 0.27–0.63%, Si: 0.25% max, P ≤ 0.035%, S ≤ 0.035% |
Stainless Steel 304 / 304L |
ASTM A213 / A249 TP304L |
UNS S30403 |
0.030% max |
18.0 – 20.0% |
8.0 – 12.0% |
— |
Mn: 2.00% max, Si: 0.75% max, N ≤ 0.10% |
Stainless Steel 316 / 316L |
ASTM A213 / A249 TP316L |
UNS S31603 |
0.030% max |
16.0 – 18.0% |
10.0 – 14.0% |
2.00 – 3.00% |
Mn: 2.00% max, Si: 0.75% max, N ≤ 0.10% |
Alloy Steel T11 (1.25Cr-0.5Mo) |
ASTM A213 Grade T11 |
UNS K11597 |
0.05 – 0.15% |
1.00 – 1.50% |
— |
0.44 – 0.65% |
Mn: 0.30–0.60%, Si: 0.50–1.00%, P ≤ 0.025%, S ≤ 0.025% |
Alloy Steel T22 (2.25Cr-1Mo) |
ASTM A213 Grade T22 |
UNS K21590 |
0.05 – 0.15% |
1.90 – 2.60% |
— |
0.87 – 1.13% |
Mn: 0.30–0.60%, Si: 0.50% max, P ≤ 0.025%, S ≤ 0.025% |
Duplex Stainless Steel 2205 |
ASTM A789 / A790 2205 |
UNS S31803 / S32205 |
0.030% max |
22.0 – 23.0% |
4.5 – 6.5% |
3.00 – 3.50% |
Mn: 2.00% max, Si: 1.00% max, N: 0.14–0.20% |
Nickel Alloy Inconel 625 |
ASTM B444 / B704 |
UNS N06625 |
0.10% max |
20.0 – 23.0% |
58.0% min |
8.0 – 10.0% |
Nb+Ta: 3.15–4.15%, Fe ≤ 5.0%, Ti ≤ 0.40%, Al ≤ 0.40% |
High Frequency Resistance Welded Finned Tubes Mechanical Properties
| Material / Property | Tensile Strength | Yield Strength | Elongation | Hardness | Fin-to-Tube Weld Integrity | Thermal Cycling Resistance | Vibration Resistance |
|---|---|---|---|---|---|---|---|
Requirement / Range |
~370 – 760+ MPa |
~205 – 550+ MPa |
~20 – 45% |
Grade & material dependent |
Verify using documented weld-tension/peel or applicable production test method |
Suitable for repeated heating and cooling cycles |
Suitable for demanding industrial heat-transfer environments |
Testing & Verification |
Base tube MTR / Tension test |
Base tube MTR / Tension test |
Standard pull testing |
Rockwell / Brinell per base spec |
Report actual acceptance criterion only if confirmed by QC |
HAZ / Weld qualification |
Full-penetration resistance weld verification |
Types of High Frequency Resistance Welded Finned Tubes
- Solid High Frequency Welded Finned Tubes
- Serrated High Frequency Welded Finned Tubes
- Carbon Steel HF Welded Finned Tubes
- Stainless Steel HF Welded Finned Tubes
- Alloy Steel HF Welded Finned Tubes
- Duplex Stainless Steel HF Welded Finned Tubes
- Nickel Alloy HF Welded Finned Tubes
- Low-Fin High Frequency Welded Finned Tubes
Applications and Industrial Uses of High Frequency Resistance Welded Finned Tubes
- Air-Cooled Heat Exchangers
- Boiler Economizers
- Waste Heat Recovery Units
- Heat Recovery Steam Generators (HRSG)
- Fin-Fan Coolers
- Petrochemical Process Coolers
- Power Generation Plants
- Industrial Process Heating Systems
Frequently Asked Questions
What are High Frequency Resistance Welded Finned Tubes?
HF welded finned tubes are heat-transfer tubes made by helically welding a continuous fin strip to a base tube using high-frequency resistance welding.
Are HF welded finned tubes suitable for boilers and economizers?
Yes, they are widely used in boilers, economizers, waste heat recovery units, and other heat-transfer systems.
What sizes are available for High Frequency Resistance Welded Finned Tubes?
Typical sizes include 26–168.3 mm base tube OD, with fin heights of approximately 6.35–38 mm, depending on the design.
Can HF welded finned tubes be customized?
Yes, they can be customized in tube diameter, wall thickness, fin height, thickness, pitch, material, and length.
What welding process is used for High Frequency Resistance Welded Finned Tubes?
They are manufactured using high-frequency resistance welding (HFRW) to create a continuous fin-to-tube bond.
Are High Frequency Resistance Welded Finned Tubes suitable for heat exchangers?
Yes, they are suitable for air-cooled heat exchangers, fin-fan coolers, process coolers, and other industrial heat-transfer equipment.
