In the past few years, copper nickel tubes have started to be used in more and more industries, give their high resistance to corrosion (especially in seawater). Copper nickel tubes are used in the following domains:
Often times, copper nickel tubes are used in heat exchangers on naval vessels. Heat exchangers are actually represented by a set of tubes. These are mounted between tube plates. The whole ensemble is arranged so that it will fit under a protective coverage. The heat exchanger has special holes through which the gas/liquid can enter or exit. The main purpose is for the gas or liquid to be either cooled down or heated. Sometimes, the copper nickel tubes are cooled through internal processes (water-based). In such situations, each tube plate has a water box outside, for the cooling process.
Copper nickel tubes are used in heat exchangers that function through seawater cooling. There are several reasons why copper nickel tubes are chosen, including the high resistance to corrosion (especially since the cooling is done with seawater), the guaranteed strength and flexibility and the life-time resistance. Plus, copper nickel tubes are well known to be resistant against marine deposits, without their integrity being affected.
Returning to the main subject, it should be mentioned that there are two types of copper nickel tubes. The first is C70600 (90/10) and the second is C71500 (70/30). Both of these two types have different mechanical and chemical properties. The first one to have been developed is the 70/30 (1920), being used in condensers for naval vessels. The second is the 90/10 (1950), being used for seawater piping.
Mechanical and chemical properties | 70/30 Copper Nickel | 90/10 Copper Nickel |
Density | 8.94 g/cm3 | 8.94 g/cm3 |
Elastic modulus | 150 GPa | 140 GPa |
Electrical conductivity | 5% IACS | 9% IACS |
Elongation at break | 3-36% | 3-35% |
Melting onset | 1170 °C | 1100 °C |
Shear modulus | 57 GPa | 52 GPa |
Specific heat capacity | 380 J/kg-K | 380 J/kg-K |
Strength to weight ratio | 43-65 kN-m/kg | 39-63 kN-m/kg |
Tensile strength (ultimate) | 380-580 MPa | 350-565 MPa |
Tensile strength (yield) | 125-545 MPa | 63-90 MPa |
Thermal conductivity | 29 W/m-K | 40 W/m-K |
Thermal diffusivity | 9 | 12 |
Thermal expansion | 16.2 µm/m-K | 17.1 µm/m-K |
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