CuNi23 Resistance Alloy

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Introduction
CuNi23 resistance alloy is one of copper nickel binary alloys, having low temperature coefficient of resistance. It is applied to make rheostat, shunt, controller and other low voltage electrical components with a maximum operating temperature of 300°C. Due to its good heat coefficient, this alloy is widely used in low temperature heating cable of automobile heating cushion, railway snow melting, etc.

Type of supply

Type	Size
Round wire	D=0.06mm~8mm
Flat wire	W=0.4~40mm	T=0.05~2.9mm
Strip	W=8~200mm	T=0.1~3.0mm
Foil	W=6~120mm	T=0.005~0.1mm
Rod	Dia=8~100mm	L=50~1000mm

Main chemical composition (%)

Nickel	23	Manganese	0.5
Copper	Balance

Physical parameters

Yield strength (Mpa)	Tensile strength (Mpa)	Elongation (%)	Density (g/cm³)	Resistivity (20℃) (Ω・mm²/m)	Resistance temperature coefficient (20℃~600℃) 10-5/℃	Conductivity (20℃) (WmK)	Electromotive force against copper (μV/℃ ) (0~100℃)	Expansion coefficient (20 ℃- 400℃) x10-6/K	Specific heat capacity (20℃) (J/g・K)	Melting point (℃)	Max.operating temperature (℃)	Magnetism
170	350	25	8.9	0.30	＜16	33	-34	17.5	0.380	1150	300	Non magnetic

Corrosion resistance performance

Atmospheric corrosion resistance at 20℃	Corrosion resistance at maximum operating temperature
	Air and other oxygen-containing gases	Ammonia containing gas	Sulfurous gas	Sulfurous gas	Carburization
			(oxidizability)	(reducibility)
Good	Common	Common	Common	Poor	Good

Index
alloy strip, resistance wire