Copper Nickel Resistance Wire
Our copper nickel resistance wire is vital in the production of components in thermal overload relays, low resistance thermal circuit breakers and electrical appliances. These wires are also important in the production of many electrical heating cables. Constantan is a popular alloy for these components because of its variability and strain resistant elements along with its corrosion resistance. The copper nickel resistance wire is suitable for a variety of applications and has a maximum operating temperature of 400°C. Making them ill-suited for use in industrial furnaces and other high heat environments.
This alloy has a chemical composition of copper and nickel with addition of manganese with low resistivity (from 0.49 to 0.05 Ohm mm²/m).
The most known, CuNi 44 (also called Constantan) has the advantage of a very low temperature coefficient.
Their advantages are the following:
Very good resistance to corrosion
Excellent malleability
Practical solderability
Note:
1. Do not store for more than 6 months.2. Not suitable for humid environments.
| TYPE | CuNi1 NC003 | CuNi2 NC005 | CuNi6 NC010 | CuNi8 NC012 | CuMn3 MC012 | CuNi10 NC015 | CuNi14 NC020 | CuNi19 NC025 | CuNi23 NC030 | CuN30 NC035 | CuNi34 NC040 | CuNi44 NC050 | |
| Composition(%) | Cu | Rest | Rest | Rest | Rest | Rest | Rest | Rest | Rest | Rest | Rest | Rest | Rest |
| Mn | -- | -- | -- | -- | 3 | -- | 0.3 | 0.5 | 0.5 | 1.0 | 1.0 | 1.0 | |
| Ni | 1 | 2 | 6 | 8 | 10 | 14.2 | 19 | 23 | 30 | 34 | 44 | ||
| Max. continuous operating temperature ℃ | 200 | 200 | 220 | 250 | 200 | 250 | 300 | 300 | 300 | 350 | 350 | 400 | |
| Nominal value μO·m(20 ℃) | 0.03±10% | 0.05±10% | 0.1±10% | 0.12±10% | 0.12±10% | 0.15±10% | 0.2±5% | 0.25±5% | 0.3±5% | 0.35±5% | 0.4±5% | 0.49±5% | |
| Resistance-temperature coefficient×10-6/ ℃(20-600 ℃) | <100 | <120 | <60 | <57 | <38 | <50 | <38 | <25 | <16 | <10 | -0 | <-6 | |
| Thermovoltage to copper at 20 ℃ in μV/K | -8 | -12 | -18 | -22 | 1 | -25 | -28 | -32 | -34 | -37 | -39 | -43 | |
| Mean coefficient of linear thermal expansion, in 10-6/k, at a temperature between20 ℃ and 400 ℃ | 17.5 | 17.5 | 17.5 | 17.5 | 18 | 17.5 | 17.5 | 17.5 | 17.5 | 17.0 | 16.0 | 15.0 | |
| Thermal conductance at 20 ℃ W/mK | 145 | 130 | 92 | 75 | 84 | 59 | 48 | 38 | 33 | 27 | 25 | 23 | |
| Specific heat capacity at 20 ℃ in 20 ℃ J/gK | 0.38 | 0.38 | 0.38 | 0.38 | 0.39 | 0.38 | 0.38 | 0.38 | 0.38 | 0.39 | 0.40 | 0.41 | |
| Density at 20 ℃ (g/cm3) | 8.9 | 8.9 | 8.9 | 8.9 | 8.8 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | |
| Melting temperature in ℃ | 1085 | 1090 | 1095 | 1097 | 1050 | 1100 | 1115 | 1135 | 1150 | 1170 | 1180 | 1280 | |
| Min. tensile strength in N/mm² | 210 | 220 | 250 | 270 | 290 | 290 | 310 | 340 | 350 | 400 | 400 | 420 | |
| Elongation% | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | |
