Micro Fin Tubes are heat transfer tubes which have an internal, enhanced, heat transfer surface for use in refrigeration, air conditioning and industrial heat exchanger systems. The internal surface area of their continuous helical micro-fins can be around 30% to 60% larger than smooth bore tube internal surface area and they have higher heat transfer capacity than smooth bore tubes. These are typically used in evaporators, condensers, chillers and HVAC&R equipment that require compact design and efficient heat exchange. They are available in copper and any compatible alloy material, and can be provided in various dimensions, fin profiles and configurations. Developed to the relevant ASME and ASTM parameters Amardeep Steel Centre is a trusted manufacturer and supplier of Micro Fin Tubes in India.
Technical Data
Specifications of Micro Fin Tubes
Attribute | Technical Specification |
|---|---|
Standard Tube Materials | Copper (C12200), Copper-Nickel (CuNi 90/10, CuNi 70/30), Stainless Steel (304L, 316L), Carbon Steel, Titanium (Grade 2), Aluminium Brass (C68700) |
Outer Diameter (OD) | 6.0 mm to 50.8 mm (0.236" to 2.0") |
Wall Thickness (Bottom Wall) | 0.50 mm to 3.0 mm (0.020" to 0.118") |
Fin Type | Internal Helical Micro Fins (Smooth / Grooved Profile) |
Fin Height (h_f) | 0.05 mm to 0.50 mm (0.002" to 0.020") |
Helix Angle (beta) | 0° (Straight) to 30° (Helical) |
Number of Fins (N_f) | 40 to 80 fins per inner circumference |
Standard Lengths | Straight lengths up to 18 meters, or level-wound coils (LWC) |
Applicable Standards | ASTM B111, ASTM B359, ASTM A213, ASTM A269, ASTM A312, ASME SB111 |
Operating Temperature Range | Up to 400°C (Material Dependent) |
Quality Testing & Inspection | Eddy Current Test (ECT), Hydrostatic Pressure Test, Pneumatic Test, Grain Size Analysis, Dimensional Tolerance Checks |
Chemical Compositions of Micro Fin Tubes
Metric / Alloy | Copper UNS C12200 (DHP) | CuNi 90/10 (UNS C70600) | CuNi 70/30 (UNS C71500) | Aluminium Brass (UNS C68700) | Stainless Steel 316L (UNS S31603) | Titanium Grade 2 (UNS R50400) |
|---|---|---|---|---|---|---|
Copper (Cu) | ≥ 99.90% | Remainder | Remainder | 76.0% - 79.0% | — | — |
Nickel (Ni) | — | 9.0% - 11.0% | 29.0% - 33.0% | — | 10.0% - 14.0% | — |
Iron (Fe) | — | 1.0% - 1.8% | 0.4% - 1.0% | — | Remainder | ≤ 0.30% |
Manganese (Mn) | — | ≤ 1.0% | ≤ 1.0% | — | — | — |
Zinc (Zn) | — | ≤ 1.0% | ≤ 1.0% | Remainder | — | — |
Aluminium (Al) | — | — | — | 1.8% - 2.5% | — | — |
Arsenic (As) | — | — | — | 0.02% - 0.06% | — | — |
Chromium (Cr) | — | — | — | — | 16.0% - 18.0% | — |
Molybdenum (Mo) | — | — | — | — | 2.0% - 3.0% | — |
Carbon (C) | — | — | — | — | ≤ 0.030% | ≤ 0.08% |
Phosphorus (P) | 0.015% - 0.040% | — | — | — | — | — |
Titanium (Ti) | — | — | — | — | — | Remainder |
Oxygen (O) | — | — | — | — | — | ≤ 0.25% |
Nitrogen (N) | — | — | — | — | — | ≤ 0.03% |
Hydrogen (H) | — | — | — | — | — | ≤ 0.015% |
Mechanical Properties of Micro Fin Tubes
Metric / Property | Copper C12200 (Annealed O60) | Copper C12200 (Light Drawn H55) | CuNi 90/10 C70600 (Annealed O60) | CuNi 70/30 C71500 (Annealed O60) | Aluminium Brass C68700 (Annealed O60) | Stainless Steel 316L (Solution Annealed) | Titanium Grade 2 (Annealed) |
|---|---|---|---|---|---|---|---|
Tensile Strength (MPa) | ≥ 205 | 250 - 320 | ≥ 275 | ≥ 360 | ≥ 345 | ≥ 485 | ≥ 345 |
Yield Strength (MPa) | ≥ 69 | ≥ 200 | ≥ 105 | ≥ 125 | ≥ 125 | ≥ 170 | 275 - 450 |
Elongation (% in 50 mm) | ≥ 40% | ≥ 15% | ≥ 30% | ≥ 30% | ≥ 35% | ≥ 40% | ≥ 20% |
Hardness (HRF / HRB) | ≤ 60 HRF | 65 - 80 HRF | ≤ 75 HRF | ≤ 85 HRF | ≤ 75 HRF | ≤ 90 HRB | ≤ 80 HRB |
Equivalent Grades of Micro Fin Tubes
Standard Body / Region | DHP Copper | Copper-Nickel 90/10 | Copper-Nickel 70/30 | Aluminium Brass | Stainless Steel 316L | Titanium Grade 2 |
|---|---|---|---|---|---|---|
UNS Designation | UNS C12200 | UNS C70600 | UNS C71500 | UNS C68700 | UNS S31603 | UNS R50400 |
US / ASTM Standard | ASTM B111 / B359 C12200 | ASTM B111 / SB111 C70600 | ASTM B111 / SB111 C71500 | ASTM B111 C68700 | ASTM A213 / A269 TP316L | ASTM B338 Grade 2 |
EN / DIN Standard | Cu-DHP (2.0470 / CW024A) | CuNi10Fe1Mn (2.0872 / CW352H) | CuNi30Mn1Fe (2.0882 / CW354H) | CuZn20Al2As (2.0460 / CW702R) | X2CrNiMo17-12-2 (1.4404) | Titanium Grade 2 (3.7035) |
BS (British) Standard | C106 | CN102 | CN107 | CZ110 | 316S11 | Ti-P02 |
JIS (Japan) Standard | C1220 | C7060 | C7150 | C6870 | SUS 316L | JIS Class 2 |
Performance Comparison of Micro Fin Tubes
Performance Metric | Smooth Tube | Micro-Fin Tube | Performance Impact |
|---|---|---|---|
Tube-Side Heat Transfer Coefficient | ~1,500 W/m²K | ~2,500 W/m²K | 80–180% higher relative thermal enhancement |
Relative Pressure Drop Increase | Baseline | Baseline + 20–80% | 20–80% higher pressure drop |
Internal Surface Area | Baseline | Up to +30–60% | 30–60% greater internal surface area |
Micro Fin Tubes in copper, stainless & alloys to ASTM B359. Up to 180% higher heat transfer for evaporators & condensers. Request a quote today.
Request a QuoteApplications and Industrial Uses of Micro Fin Tubes
- Refrigeration Evaporators
- Air Conditioning Condensers
- Residential and Commercial Heat Pumps
- Chiller Systems
- HVAC&R Heat Exchangers
- Automotive Air Conditioning Systems
- Industrial Refrigeration Equipment
- Heat Recovery and Thermal Energy Systems
Frequently Asked Questions
What are Micro Fin Tubes?
Micro Fin Tubes are heat exchanger tubes with small, continuous helical fins formed on their inner surface to improve heat transfer.
How do Micro Fin Tubes improve heat transfer efficiency?
They increase internal surface area and create fluid turbulence, allowing heat to transfer more efficiently.
What is the difference between Micro Fin Tubes and smooth tubes?
Micro Fin Tubes have internal helical fins, while smooth tubes have a plain inner surface. Micro fins generally provide improved heat transfer performance.
What are Micro Fin Tubes used for?
They are used in evaporators, condensers, chillers, heat pumps, and HVAC&R heat exchanger systems.
Why are Micro Fin Tubes used in evaporators and condensers?
They improve refrigerant-side heat transfer, helping increase thermal efficiency and support compact equipment designs.
How do internal helical fins improve refrigerant flow?
Internal helical fins create swirling motion and increase turbulence, improving refrigerant contact with the tube surface.
Can Micro Fin Tubes be customized for specific heat exchanger applications?
Yes. Micro Fin Tubes can be customized in materials, dimensions, fin height, fin pitch, and internal fin profiles according to project requirements.
