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Low Finned Tube ASTM B111 C70600 Copper Nickel Alloy Tube For Condenser or Evaporator
Low thread finned tube is a kind of high efficiency heat exchange tube which is rolled to form spiral fin on its outer surface.
The strengthening effect of this type of tube is outside the tube. On the one hand, the heat transfer area is increased by the screw fin; on the other hand, when the shell side medium flows through the surface of the threaded tube, the surface screw fin has a segmentation effect on the laminar flow side layer, which reduces the thickness of the boundary layer. Moreover, the turbulence formed on the surface is stronger than that of the smooth tube, which further reduces the thickness of the boundary layer.
It is suitable for the shell side medium is relatively clean, no corrosion, no scaling, can use low thread finned tube as heat exchange element to form low thread finned tube high efficiency heat exchanger.
1.Chemical & Mechanical Properties
| ASTM B111 C70600 Chemical Composition (%) |
| Cu | Ni | Fe | Mn | Zn | Pb |
| ≥86.5% | 9.0% ~ 11.0% | 1.0% ~ 1.8% | ≤1.0% | ≤1.0% | ≤0.05% |
Mechanical Properties
| Property | Standard Value |
Tensile Strength
| O61 Annealed ≥ 40ksi |
| H55 Light-drawn ≥ 45ksi |
Yield Strength
| O61 Annealed ≥ 15ksi |
| H55 Light-drawn ≥ 35ksi |
| Elongation | ≥ 30% |
| Hardness | O61 Annealed 40-65 HRB |
2. Key Features
(1) Helical low fins increase surface area by 30-50%, significantly enhancing heat transfer coefficient (ideal for low-velocity fluids).
(2) C70600 alloy forms a protective oxide layer in seawater; fin design minimizes fouling.
(3) Cu-Ni base material + cold-formed fins provide high tensile strength (≥275 MPa) and pressure resistance.
(4) Copper ions naturally inhibit marine growth, reducing maintenance downtime.
3. Key Applications
Marine & Offshore
- Marine Condensers & Central Coolers
- Offshore Oil Platform Heat Exchangers
Chemical & Petrochemical
- Acid Gas Coolers (H₂S/CO₂ Service)
- High-Salinity Wastewater Evaporators
Energy & Power
- LNG Vaporizers & Cold Energy Recovery
- Geothermal Power Condensers
Environmental & New Energy
- Desalination MED Plants
- Fuel Cell Thermal Management
Special Industries
- Nuclear Plant Auxiliary Cooling
- Pharmaceutical Grade Heat Transfer
Equivalent materials to UNS C70600
| ASME SB111 | ASME SB171 | ASME SB359 | ASME SB466 | ASME SB467 |
| ASME SB395 | ASME SB543 | ASTM B111 | ASTM B151 | ASTM B122 |
| ASTM B171 | ASTM B359 | ASTM B395 | ASTM B432 | ASTM B466 |
| ASTM B469 | ASTM B543 | ASTM B608 | DIN 2.0872 | MIL C-15726 |
| MIL T-15005 | MIL T-16420 | MIL T-22214 | SAE J461 | SAE J463 |
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ASTM B111 C70600 Copper Nickel Alloy Low Finned Tube For Condenser and Evaporator Images
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