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Constantan wire(CuNi40) wireSize: 0.1mm-8mmElectric heating wire: NI80Cr20, Ni70Cr30, Ni60Cr15, CuNi45, CuNi40, CuNi34, CuNi30, CuNi23, CuNi19, CuNi14, CuNi10, CuNi8, CuNi6, CuNi2, CuNi1 etc.
| Main performance of Ni-Cr and Ni-Cr-Fe electric heating alloys | ||||||
| Grade property performance | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 | |
| % Main Chemical Composition | Ni | Balance | Balance | 55.0-61.0 | 34.0-37.0 | 30.0-34.0 |
| Cr | 20.0-23.0 | 28.0-31.0 | 15.0-18.0 | 18.0-21.0 | 18.0-21.0 | |
| Fe | ≤1.0 | ≤1.0 | Balance | Balance | Balance | |
| °C Max contimnous service Temp. of element | 1200 | 1200 | 1150 | 1100 | 1100 | |
| Resistiuity | 1.09 | 1.09 | 1.12 | 1 | 1.04 | |
| g/cm3 Density | 8.4 | 8.4 | 8.2 | 7.9 | 7.9 | |
| KJ/M.h°C Thermal conductivity | 60.3 | 60.3 | 45.2 | 43.8 | 43.8 | |
| Coefficient of linear expansion | 18 | 18 | 17 | 19 | 19 | |
| Melting point≈ °C (approxi) | 1400 | 1400 | 1390 | 1390 | 1390 | |
| % Elongation | 720 | 720 | 720 | 720 | 720 | |
| Micrograhic structure | austenite | austenite | austenite | austenite | austenite | |
| Magnetic property | nonmagnetic | nonmagnetic | nonmagnetic | nonmagnetic | nonmagnetic | |
Constantan