CuNi40

Alloy Category: Constantan Alloy Base Material Shape: Wire (Round/Flat Wire) Alloy Series: Copper Nickel Alloy Implementation Standard: GB/T-2010

Category：

Copper Nickel Series

Keywords：High resistance electric heating alloy | Corrosion-resistant alloy | Thermal spraying materials

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CuNi40

CuNi40 copper-nickel alloy is a resistance alloy primarily composed of copper and nickel. It features a low temperature coefficient of resistance, excellent machinability, corrosion resistance, and easy brazing, making it suitable for manufacturing various standard resistors, shunts, and precision resistors.

This alloy is non-magnetic. It is used in variable resistors and strain gauge potentiometers for electric recuperators, heating wires, heating cables and pads. It is used with bimetals for heating. Another application is in the manufacturing of thermocouples, as its combination with other metals generates a high electromotive force (EMF).

Temperature Coefficient of Resistance

A resistance alloy primarily composed of copper and nickel, it has a low temperature coefficient of resistance

Machinability

A resistance alloy primarily composed of copper and nickel, with good machinability

Corrosion Resistance

Corrosion resistance and easy brazing, allowing for the production of various standard resistors, shunts, and precision resistors.

Suitable for resistors, potentiometers, heating wires, heating cables and underground heating networks, flexible coaxial cables and communication cables, various audio-video cables, automotive signal cables, network cables, data transmission cables for weaving and shielding, etc.

Chemical Composition

Copper Nickel / 6J40	P	S	C	Ni	Mn	Fe	Al	Cu
Min				39	1			Balance
Max	0.02	0.02	0.1	41	2	0.5	0.1

Physical Properties

Density	8.9 g/cm³
Resistance (20℃)	0.48±0.03 (μΩ·m)
Temperature Coefficient	0~+40 (a×10-6 ℃)
Operating Temperature	0~400℃
Tensile Strength	390~450MPa
Elongation	12~32%
Melting Point	1200-1260℃
Thermal Conductivity	19.6 W/(m·K)

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