(Common Name: CuNi30, NC35, Cu70Ni30)
CuNi30 is a copper-nickel alloy (Cu70Ni30 alloy) with low resistivity for use at temperatures up to 350°C. It 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. CuNi30 is typically used for low-temperature applications such as heating cables.
Normal composition%
Nickel | 30 | Manganese | 0.5 |
Copper | Bal. |
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Typical Mechanical properties(1.0mm)
Yield strength | Tensile Strength | Elongation |
Mpa | Mpa | % |
200 | 400 | 25 |
Typical Physical properties
Density (g/cm3) | 8.9 |
Electrical resistivity at 20℃ (Ωmm2/m) | 0.35 |
Temperature factor of resistivity(20℃~600℃)X10-5/℃ | <10 |
7Conductivity coefficient at 20℃ (WmK) | 27 |
EMF vs Cu(μV/℃ )(0~100℃ ) | -37 |
Coefficient of thermal expansion |
Temperature | Thermal Expansion x10-6/K |
20 ℃- 400℃ | 17 |
Specific heat capacity |
Temperature | 20℃ |
J/gK | 0.390 |
Melting point (℃) | 1170 |
Max continuous operating temperature in air (℃) | 350 |
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 |
CuNi30 | good | good | good | good | 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 |
