Spiral Crimped Fin Tubes Manufacturer & Supplier
Spiral Crimped Finned Tubes are high efficiency extended surface heat transfer components manufactured by spirally winding a metallic fin strip under high mechanical tension around a central base tube. During this continuous spiral winding process, the root foot of the fin strip is mechanically deformed into a micro-corrugated structure. This distinctive crimped foot pattern bites firmly into the base tube wall, maximising physical contact surface area and securing structural grip. To guarantee long term integrity under heavy thermal cycling, the starting and ending points of the fin strip are permanently secured via precision spot welding or soldering. Across global engineering procurement, these heat transfer components are specified interchangeably as Spiral Crimped Finned Tubes or spiral wound fin tubes. Both designations describe this exact continuous spiral winding with a corrugated foot profile. Amardeep Steel Centre supplies premium-grade crimped spiral finned tubes designed to resist operational vibration, cyclic heat expansion, and harsh working environments across air-cooled heat exchangers, industrial radiators, and crop drying systems.
What Is a Spiral Crimped Fin Tubes?
The crimping is what separates this fin type from a plain L type fin. On an L-type fin, the strip foot simply wraps around the tube under tension with no corrugation. On a crimped fin, the foot is mechanically deformed into a corrugated or serrated shape as it winds on in a spiral, which increases the contact area between the fin and the tube and gives the fin a much firmer mechanical grip once it is in place. That firmer grip is also what allows a crimped fin tube to survive vibration and thermal cycling better than a plain wrapped fin, since the corrugated foot resists working loose over repeated heating and cooling.
The result is a fin tube with a genuinely large heat transfer surface built onto a comparatively small base tube, at a lower cost than an extruded fin tube, which is why crimped fin tubes, under whichever name a buyer searches for it, shows up so often in air-cooled duty and industrial drying equipment where budget matters as much as thermal performance.
Technical Data
Spiral Crimped Type Finned Tube Specification
| Specification | Detail |
|---|---|
Base tube material | Carbon steel, alloy steel, stainless steel, copper, copper alloy |
Fin material | Aluminium (grade 1060, 1070 or 1100), copper, stainless steel, galvanised iron |
Base tube outer diameter | 9.5 mm to 90 mm |
Fin height | 6 mm to 45 mm |
Fin thickness | 0.3 mm to 1.2 mm |
Fin pitch | 5 to 10 fins per inch standard, other pitches on request |
Construction | Tension wound in a continuous spiral, crimped foot, fin ends welded or soldered to base tube |
Standard length | Up to 6 metres, custom lengths on request |
Finish | Galvanised on request for carbon steel base tube |
Chemical Composition of Spiral Crimped Fin Tube Base Materials
| Material | Carbon (C) max | Manganese (Mn) max | Chromium (Cr) | Nickel (Ni) | Other |
|---|---|---|---|---|---|
Carbon steel (ASTM A179) | 0.06 to 0.18 | 0.27 to 0.63 | Not applicable | Not applicable | Silicon 0.25 max |
Alloy steel T11 | 0.05 to 0.15 | 0.30 to 0.60 | 1.00 to 1.50 | Not applicable | Molybdenum 0.44 to 0.65 |
Alloy steel T22 | 0.05 to 0.15 | 0.30 to 0.60 | 1.90 to 2.60 | Not applicable | Molybdenum 0.87 to 1.13 |
Stainless steel TP304 | 0.08 max | 2.00 max | 18.0 to 20.0 | 8.0 to 10.5 | Silicon 0.75 max |
Stainless steel TP316 | 0.08 max | 2.00 max | 16.0 to 18.0 | 10.0 to 14.0 | Molybdenum 2.0 to 3.0 |
Mechanical Properties of Spiral Crimped Fin Tubes Base Materials
| Material | Tensile Strength (MPa) minimum | Yield Strength (MPa) minimum | Elongation (%) minimum |
|---|---|---|---|
Carbon steel (ASTM A179) | 325 | 180 | 35 |
Alloy steel T11 | 415 | 205 | 30 |
Alloy steel T22 | 415 | 205 | 30 |
Stainless steel TP304 | 515 | 205 | 35 |
Stainless steel TP316 | 515 | 205 | 35 |
Spiral Crimped Fin Tube Dimension Chart
| Base Tube OD (mm) | Fin Height (mm) | Fin Thickness (mm) | Fin Pitch (FPI) |
|---|---|---|---|
15.88 | 10 | 0.4 | 8 |
19.05 | 13 | 0.5 | 8 |
25.40 | 16 | 0.6 | 7 |
31.75 | 19 | 0.8 | 6 |
38.10 | 25 | 1.0 | 5 |
50.80 | 32 | 1.0 | 5 |
63.00 | 38 | 1.2 | 5 |
Working Pressure Guide
| Base Tube OD (mm) | Wall Thickness (mm) | Indicative Working Pressure (bar) |
|---|---|---|
15.88 | 1.65 | 140 |
19.05 | 2.11 | 145 |
25.40 | 2.77 | 140 |
31.75 | 3.40 | 135 |
38.10 | 3.68 | 130 |
Corrosion and Mechanical Resistance by Crimped Spiral Finned Tubes Types
| Fin Type | Atmospheric Corrosion Resistance | Mechanical Resistance | Typical Maximum Working Temperature |
|---|---|---|---|
L type fin | Fair, depends on base tube and fin material | Poor, tension alone holds the foot in place | Broadly similar range to crimped, lower in practice due to a weaker grip |
Crimped fin (spiral crimped, spiral wound) | Good, particularly with a stainless steel base tube. | Good, the crimped foot resists loosening under vibration. | Up to around 180 degrees Celsius in stainless steel construction |
Extruded fin | Very good; the fin is mechanically bonded and fully covers the tube. | Very good, no reliance on tension at all | Higher than either wound fin type |
Base Tube Standards Available for Spiral Crimped Fin Tubes
| Base Tube Material | Common Standard or Grade |
|---|---|
Carbon steel | ASTM A179, ASTM A192, ASTM A210 |
Alloy steel | ASTM A213 / A269, grades T5, T11, T22 |
Stainless steel | ASTM A213 / A269, grades TP304 / TP304L, TP316 / TP316L |
Need Custom Dimension Spiral Crimped Finned Tubes?
Amardeep Steel manufactures custom spiral wound fin tubes tailored to your exact pressure, temperature, and pitch specifications.
Applications and Industries for Spiral Crimped Fin Tubes
Spiral crimped finned tubes are deployed across diverse sectors requiring durable heat transfer performance and reliable thermal dissipation.
- Agricultural Crop Processing: Tea leaf drying units, coffee bean drying systems, cashew nut processing, paddy drying plants, prawn dryers, and sago production facilities.
- Timber and Material Processing: Plywood drying kilns, wood veneer dryers, and industrial textile heat treatment equipment.
- HVAC and Refrigeration: Commercial air cooling coils, heavy duty refrigeration condensers, and space heating radiators.
- General Process Engineering: Industrial air heaters, waste heat recovery systems, compressor air coolers, and steam heat exchangers.
Frequently Asked Questions About Crimped Spiral Finned Tubes
What is a Spiral Crimped Finned Tube?
A spiral crimped finned tube is an extended surface tube fabricated by spirally wrapping a thin metal fin strip under high mechanical tension around a base tube. During winding, the fin root is crimped into micro-corrugations that lock firmly against the tube wall, enhancing both mechanical adhesion and thermal efficiency.
Are Spiral Crimped Finned Tubes the same as spiral wound fin tubes?
Yes. In industrial thermal engineering, spiral crimped finned tubes and spiral wound fin tubes describe the identical manufacturing technique, highlighting both the spiral application and the corrugated root construction.
What maximum temperature can spiral crimped heat exchanger tubes handle?
When manufactured using stainless steel base tubes and matching fins, these assemblies operate reliably up to 180 degrees Celsius. Operating limits depend on the chosen base tube alloy and environmental conditions.
How are fins secured at the tube ends?
While high tension and the corrugated crimped foot hold the main body of the fin in place, the starting and ending ends of each fin strip are spot welded or soldered directly to the tube wall to prevent unwinding.
What material combinations can be manufactured?
Amardeep Steel supplies spiral crimped finned tubes using base materials such as ASTM A179 carbon steel, ASTM A213 alloy steel, and 316 stainless steel, combined with fins made from aluminium, copper, stainless steel, or galvanised steel.
Related Products
Extruded Finned Tubes, G Fin Tubes, H Fin Tubes, KL Finned Tubes, Helical Serrated Finned Tubes, Helical Solid Finned Tubes, Helically Wound High Fin Tubes, Shoulder Tension Finned Tubes, Corrugated Finned Tube
Get a Quote for Crimped Type Finned Tubes
Request a quote with your base tube material, fin material, dimensions and quantity, and our team will confirm price and availability the same working day.
