Copper Nickel Alloys
Model No.:
CuNi1, CuNi2, CuNi6, CuNi8, CuNi10, CuNi14, CuNi19, CuNi23, CuNi30, CuNi44.
Those are alloys of chemical composition copper + nickel with addition of manganese with a low resistivity (from 231.5 to 23.6 Ohm. Mm2/ft).
The most known, CuNi 44 (also called Constantan) presents the advantage of a very low temperature coefficient.
Their advantages are the following:
Very good resistance to corrosion
Very good malleability
Very good solderability
| Chemical Composition and Main Property of Cu-Ni Low Resistance Alloy |
| Properties\Grade | CuNi1 | CuNi2 | CuNi6 | CuNi8 | CuMn3 | CuNi10 |
| Main Chemical Composition | Ni | 1 | 2 | 6 | 8 | _ | 10 |
| Mn | _ | _ | _ | _ | 3 | _ |
| Cu | Bal | Bal | Bal | Bal | Bal | Bal |
| Max Continuous Service Temperature(º C) | 200 | 200 | 200 | 250 | 200 | 250 |
| Resisivity at 2º C (Ω mm2/m) | 0.03 | 0.05 | 0.1 | 0.12 | 0.12 | 0.15 |
| Density(g/cm3) | 8.9 | 8.9 | 8.9 | 8.9 | 8.8 | 8.9 |
| Thermal Conductivity(α × 10-6º C) | < 100 | < 120 | < 60 | < 57 | < 38 | < 50 |
| Tensile Strength(Mpa) | ≥ 210 | ≥ 220 | ≥ 250 | ≥ 270 | ≥ 290 | ≥ 290 |
| EMF vs Cu(μ Vº C)(0~10º C) | -8 | -12 | -12 | -22 | _ | -25 |
| Approximate Melting Point(º C) | 1085 | 1090 | 1095 | 1097 | 1050 | 1100 |
| Micrographic Structure | austenite | austenite | austenite | austenite | austenite | austenite |
| Magnetic Property | non | non | non | non | non | non |
|
| Properties\Grade | CuNi14 | CuNi19 | CuNi23 | CuNi30 | CuNi34 | CuNi44 |
| Main Chemical Composition | Ni | 14 | 19 | 23 | 30 | 34 | 44 |
| Mn | 0.3 | 0.5 | 0.5 | 1 | 1 | 1 |
| Cu | Bal | Bal | Bal | Bal | Bal | Bal |
| Max Continuous Service Temperatureº C) | 300 | 300 | 300 | 350 | 350 | 400 |
| Resisivity at 2º C (Ω mm2/m) | 0.2 | 0.25 | 0.3 | 0.35 | 0.4 | 0.49 |
| Density(g/cm3) | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 | 8.9 |
| Thermal Conductivity(α × 10-6º C) | < 30 | < 25 | < 16 | < 10 | < 0 | < -6 |
| Tensile Strength(Mpa) | ≥ 310 | ≥ 340 | ≥ 350 | ≥ 400 | ≥ 400 | ≥ 420 |
| EMF vs Cu(μ Vº C)(0~10º C) | -28 | -32 | -34 | -37 | -39 | -43 |
| Approximate Melting Point(º C) | 1115 | 1135 | 1150 | 1170 | 1180 | 1280 |
| Micrographic Structure | austenite | austenite | austenite | austenite | austenite | austenite |
| Magnetic Property | non | non | non | non | non | non |
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