Copper Nickel Alloy is mainly made of copper and nickel. The copper and nickel can be melted together no matter what percentage. Normally the resistivity of CuNi alloy will be higher if the Nickel content is larger than Copper content. From CuNi6 to CuNi44, the resistivity is from 0.1μΩm to 0.49μΩm. That will help the resistor manufacture choosing the most suitable alloy wire.
By the way, the Copper Nickel wire is easy to be welded and easy to be fabricated, so it can be made into many forms and widely used in all areas.
Ohmalloy provide the copper nickel grade alloy as follows:
Copper Nickel Alloy, Karma Alloy and Copper Manganese (Manganin) Alloy Data Sheet:
|
Alloy Type
|
Chemical composition %
|
Density g/cm3
|
Melting Point ℃
|
Resistivity (μΩm)(20℃)
|
Tensile Strength N/mm2
|
Elongation (%)
|
Max continuous service temp (℃)
|
|
Cu
|
Mn
|
Ni
|
Cr
|
Al
|
Fe
|
|
Copper
Nickel
(CuNi) alloy
|
CuNi44
|
Rest
|
1.0
|
44
|
-
|
-
|
-
|
8.9
|
1280
|
0.49
|
≥400
|
≥20
|
450-700
|
|
CuNi40
|
Rest
|
1.0
|
40
|
-
|
-
|
-
|
8.9
|
1280
|
0.48±0.03
|
≥400
|
≥20
|
450-700
|
|
CuNi34
|
Rest
|
1.0
|
34
|
-
|
-
|
-
|
8.9
|
1180
|
0.40
|
≥400
|
≥20
|
350-600
|
|
CuNi30
|
Rest
|
1.0
|
30
|
-
|
-
|
-
|
8.9
|
1170
|
0.35
|
≥400
|
≥20
|
350-600
|
|
CuNi23
|
Rest
|
0.5
|
23
|
-
|
-
|
-
|
8.9
|
1150
|
0.30
|
≥350
|
≥20
|
300-450
|
|
CuNi19
|
Rest
|
0.5
|
19
|
-
|
-
|
-
|
8.9
|
1135
|
0.25
|
≥340
|
≥20
|
300-450
|
|
CuNi15
|
Rest
|
0.3
|
14.5
|
-
|
-
|
-
|
8.9
|
1115
|
0.20
|
≥310
|
≥20
|
300-400
|
|
CuNi10
|
Rest
|
-
|
10
|
-
|
-
|
-
|
8.9
|
1100
|
0.15
|
≥290
|
≥20
|
250-350
|
|
CuNi8
|
Rest
|
-
|
8
|
-
|
-
|
-
|
8.9
|
1097
|
0.12
|
≥270
|
≥20
|
250-350
|
|
CuNi6
|
Rest
|
-
|
6
|
-
|
-
|
-
|
8.9
|
1095
|
0.10
|
≥251
|
≥18
|
200-300
|
|
CuNi2
|
Rest
|
-
|
2
|
-
|
-
|
-
|
8.9
|
1090
|
0.05
|
≥220
|
≥18
|
200-300
|
|
CuNi1
|
Rest
|
-
|
1
|
-
|
-
|
-
|
8.9
|
1085
|
0.03
|
≥210
|
≥18
|
200-300
|
The available dia for CuNi23 to CuNi44 is 0.025mm to 8mm.
The available dia for CuNi2 and CuNi6 is 0.1mm to 8mm.
