HF Finned Tubes are produced by the continuous high frequency electric resistance welding a steel fin strip to the outside surface of a base tube. The process generates an even metallurgical bond between the fin and tube and promotes efficient heat transfer and reliable fin attachment during thermal cycling. They have spiral fins to provide a larger external heat transfer surface area while maintaining a low footprint on the tube. HF Finned Tubes can be manufactured with specified fin height, fin thickness, fin pitch, tube diameter and tube length, which fits the equipment requirements. Typically used in economizers, waste heat boilers, process heaters, etc., and all other types of thermal recovery equipment. Amardeep Steel is a professional manufacturer and supplier of HF Finned Tubes in India, and provides application specific welded fin tube solutions.
Technical Data
Specifications of HF Finned Tubes
Parameter | Capability / Specification |
|---|---|
Base Tube Outer Diameter (OD) | 1.00 in to 15.75 in (25.4 mm to 400 mm) |
Fin Height | 0.3 in to 1.95 in (8.0 mm to 49.5 mm) |
Fin Thickness | 0.03 in to 0.16 in (0.8 mm to 4.0 mm) |
Fin Density / Pitch | 1 to 20 Fins Per Inch (FPI) / 3 mm to 25 mm Pitch |
Welding Process | High Frequency Electric Resistance Welding (HFERW) |
Base Tube Materials | Carbon Steel: ASTM A179, ASTM A192, ASTM A210 Alloy Steel: ASTM A213 (T11, T22, T91) Stainless Steel: SS 304 / 316 / 347 |
Fin Materials | Carbon Steel, Alloy Steel, Stainless Steel, Aluminium, Copper |
Chemical Compositions of HF Finned Tubes
Material Grade | Standard | Carbon (C) % | Manganese (Mn) % | Phosphorus (P) max % | Sulfur (S) max % | Silicon (Si) % | Chromium (Cr) % | Molybdenum (Mo) % |
|---|---|---|---|---|---|---|---|---|
ASTM A179 / SA179 | Carbon Steel | 0.06 – 0.18 | 0.27 – 0.63 | 0.035 | 0.035 | – | – | – |
ASTM A192 / SA192 | Carbon Steel | 0.06 – 0.18 | 0.27 – 0.63 | 0.035 | 0.035 | 0.25 max | – | – |
ASTM A210 Grade A1 | Carbon Steel | 0.27 max | 0.93 max | 0.035 | 0.035 | 0.10 min | – | – |
ASTM A213 T11 | Alloy Steel | 0.05 – 0.15 | 0.30 – 0.60 | 0.025 | 0.025 | 0.50 – 1.00 | 1.00 – 1.50 | 0.44 – 0.65 |
ASTM A213 T22 | Alloy Steel | 0.05 – 0.15 | 0.30 – 0.60 | 0.025 | 0.025 | 0.50 max | 1.90 – 2.60 | 0.87 – 1.13 |
ASTM A213 T91 | Alloy Steel | 0.08 – 0.12 | 0.30 – 0.60 | 0.020 | 0.010 | 0.20 – 0.50 | 8.00 – 9.50 | 0.85 – 1.05 |
Stainless Steel 304 | Stainless Steel | 0.08 max | 2.00 max | 0.045 | 0.030 | 0.75 max | 18.00 – 20.00 | – |
Stainless Steel 316 | Stainless Steel | 0.08 max | 2.00 max | 0.045 | 0.030 | 0.75 max | 16.00 – 18.00 | 2.00 – 3.00 |
HF Finned Tubes Mechanical Properties
Material Grade | Tensile Strength, min (MPa / ksi) | Yield Strength, min (MPa / ksi) | Elongation in 2 in (50 mm), min % | Hardness, max |
|---|---|---|---|---|
ASTM A179 | 325 MPa (47 ksi) | 180 MPa (26 ksi) | 35% | 72 HRB |
ASTM A192 | 325 MPa (47 ksi) | 180 MPa (26 ksi) | 35% | 72 HRB |
ASTM A210 Grade A1 | 415 MPa (60 ksi) | 255 MPa (37 ksi) | 30% | 79 HRB |
ASTM A213 T11 | 415 MPa (60 ksi) | 205 MPa (30 ksi) | 30% | 85 HRB |
ASTM A213 T22 | 415 MPa (60 ksi) | 205 MPa (30 ksi) | 30% | 85 HRB |
ASTM A213 T91 | 585 MPa (85 ksi) | 415 MPa (60 ksi) | 20% | 250 HBW |
Stainless Steel 304 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB |
Stainless Steel 316 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB |
Equivalent Grades of HF Finned Tubes
ASTM / ASME Standard | DIN / EN Standard | BS Standard | JIS Standard | AFNOR (France) |
|---|---|---|---|---|
ASTM A179 | St 35.8 / 1.0305 (EN 10216-2) | BS 3602 Part 1 | JIS G3461 STBL 380 | TU 37-c |
ASTM A192 | St 35.8 / 1.0405 (EN 10216-2) | BS 3602 360 | JIS G3461 STB 340 | TU 37-c |
ASTM A210 Grade A1 | 15Mo3 / 1.5415 (EN 10216-2) | BS 3602 490 | JIS G3461 STB 410 | TU 42-c |
ASTM A213 T11 | 13CrMo4-5 / 1.7335 | BS 3604 620 | JIS G3462 STBA 23 | 15 CD 4.05 |
ASTM A213 T22 | 10CrMo9-10 / 1.7380 | BS 3604 622 | JIS G3462 STBA 24 | 10 CD 9.10 |
ASTM A213 T91 | X10CrMoVNb9-1 / 1.4903 | BS 3604 629 | JIS G3462 STBA 29 | Z10 CDVNb 09.01 |
SS 304 (UNS S30400) | X5CrNi18-10 / 1.4301 | 304S31 | JIS G4305 SUS 304 | Z6 CN 18.09 |
SS 316 (UNS S31600) | X5CrNiMo17-12-2 / 1.4401 | 316S31 | JIS G4305 SUS 316 | Z7 CND 17.11.02 |
Dimensions Chart of HF Finned Tubes
Base Tube OD (mm) | Wall Thickness (mm) | Fin Height (mm) | Fin Pitch (FPI) | Fin Material | Approx. Finned OD (mm) |
|---|---|---|---|---|---|
19.05 (3/4") | 1.65 – 2.11 | 9.5 – 12.7 | 5 – 9 | Carbon / Stainless Steel | 38.1 – 44.5 |
25.40 (1") | 2.11 – 2.77 | 12.7 – 15.9 | 4 – 8 | Carbon / Stainless Steel | 50.8 – 57.2 |
31.75 (1 1/4") | 2.41 – 3.20 | 12.7 – 19.0 | 4 – 8 | Carbon / Stainless Steel | 57.2 – 69.8 |
38.10 (1 1/2") | 2.77 – 3.68 | 15.9 – 19.0 | 3 – 7 | Carbon / Stainless Steel | 69.8 – 76.2 |
50.80 (2") | 3.05 – 4.57 | 15.9 – 25.4 | 3 – 6 | Carbon / Stainless Steel | 82.6 – 101.6 |
60.32 (2 3/8") | 3.91 – 5.54 | 19.0 – 25.4 | 3 – 6 | Carbon / Stainless Steel | 98.3 – 111.1 |
73.02 (2 7/8") | 5.16 – 7.01 | 19.0 – 25.4 | 2 – 5 | Carbon / Stainless Steel | 111.0 – 123.8 |
Request a dimension chart, MTC sample and lead time for HF Finned Tubes in your required diameter and material grade.
Request a QuoteApplication and Industrial Uses of HF Finned Tubes
- Waste Heat Recovery Boilers
- Economizers
- Air Preheaters
- Process Heaters
- Gas Coolers
- Heat Recovery Units
- Power Plant Heat Exchangers
- Petrochemical Process Equipment
Frequently Asked Questions
What are HF Finned Tubes?
HF Finned Tubes are tubes with spiral fins continuously welded to the outer surface using high-frequency electric resistance welding to increase heat-transfer area.
How are HF Finned Tubes manufactured?
A fin strip is spiral-wound around the base tube and continuously welded to it using high-frequency electric resistance welding.
How do HF Finned Tubes improve heat transfer?
The fins increase the external surface area of the tube, allowing more heat to transfer between the tube and surrounding gases or fluids.
What materials are used for HF Finned Tubes?
Common materials include carbon steel, alloy steel, stainless steel, and other materials selected according to operating conditions.
Are HF Finned Tubes suitable for boilers and economizers?
Yes. They are commonly used in boilers, economizers, and waste heat recovery equipment for efficient heat transfer.
Can HF Finned Tubes be customized?
Yes. Tube material, diameter, wall thickness, fin height, fin thickness, fin pitch, and tube length can be customized to project requirements.
