Common Name: CuNi8, Alloy12, CN12
CuNi8 is a copper-nickel alloy (Cu82Ni12 alloy) with low resistivity for use at temperatures up to 250°C.
CuNi8 is kind of low resistance heating alloy. It is one of the key materials of the low-voltage electrical products. It is widely used in low-voltage circuit breaker, electric blankets, thermal overload relay, and other low-voltage electrical product.
CuNi8 is typically used for low-temperature applications such as floor heating cables.
Normal composition%
Nickel | 8 | Manganese | - |
Copper | Bal. |
|
|
Typical Mechanical properties(1.0mm)
Yield strength | Tensile Strength | Elongation |
Mpa | Mpa | % |
| 110 | 270 | 25 |
Typical Physical properties
Density (g/cm3) | 8.9 |
Electrical resistivity at 20℃ (Ωmm2/m) | 0.12 |
Temperature factor of resistivity(20℃~600℃)X10-5/℃ | <57 |
Conductivity coefficient at 20℃(WmK) | 75 |
EMF vs Cu(μV/℃ )(0~100℃) | -22 |
Coefficient of thermal expansion |
Temperature | Thermal Expansion x10-6/K |
20 ℃- 400℃ | 17.5 |
Specific heat capacity |
Temperature | 20℃ |
J/gk | 0.380 |
Corrosion resistance performance
Melting point (℃) | 1097 |
Max continuous operating temperature in air (℃) | 250 |
Magnetic properties | non-magnetic |
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 |
CuNi6 | good | bad | bad | bad | bad | good |
Style of supply
Type | Dimension |
Wire | D=0.06mm~8mm |
Ribbon | W=0.4~40 | T=0.05~2.9mm |
Strip | W=8~200mm | T=0.1~3.0 |
Foil | W=6~120mm | T=0.005~0.1 |
Bar | Dia=8~100mm | L=50~1000 |
