(Common Name: CuNi45, NC50.Cuprothal, Alloy 294, Cuprothal 294, Nico, MWS-294, Cupron, Copel, Alloy 45, Neutrology, Advance, CuNi 102, Cu-Ni 44, Konstantan,constantan.)
copper-nickel alloy (Cu56Ni44 alloy) characterized by high electrical resistance, high ductility and good corrosion resistance. It is suitable for use at temperatures up to 400°C
Typical applications are temperature-stable potentiometers, industrial rheostats and electric motor starter resistances.
The combination of negligible temperature coefficient and high resistivity makes the alloy particulary suitable for the winding of precision resistors.
It is manufactured from electrolytic copper and pure nickel. In finer wire sizes the alloy is designated as Thermocouple.
Nomal composition%
Nickel | 44 | Manganese | 1 |
Copper | Bal. |
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Typical Mechanical properties (1.0mm)
Yield strength | Tensile Strength | Elongation |
Mpa | Mpa | % |
250 | 420 | 25 |
Typical Physical properties
Density (g/cm3) | 8.9 |
Electrical resistivity at 20℃ (Ωmm2/m) | 0.49 |
Temperature factor of resistivity(20℃~600℃)X10-5/℃ | -6 |
Conductivity coefficient at 20℃ (WmK) | 23 |
EMF vs Cu(μV/℃ )(0~100℃ ) | -43 |
Coefficient of thermal expansion
Temperature | Thermal Expansion x10-6/K |
20 ℃- 400℃ | 15 |
Specific heat capacity
Temperature | 20℃ |
J/gK | 0.41 |
Melting point (℃) | 1280 |
Max continuous operating temperature in air (℃) | 400 |
Magnetic properties | non-magnetic |
Corrosion resistance performance
Alloys |
Working In atmosphere at 20℃ | Working at max temperature 200℃ |
Air and oxygen contain gases | gases with Nitrogen | gases with sulfur oxidability | gases with sulfur reductibility | carburization |
CuNi44 | good | good | good | good | bad | good |
Style of supply
Type | Dimension |
Wire | D=0.03mm~8mm |
Ribbon | W=0.4~40 | T=0.03~2.9mm |
Strip | W=8~200mm | T=0.1~3.0 |
Foil | W=6~120mm | T=0.003~0.1 |
Bar | Dia=8~100mm | L=50~1000 |
