Cr25Ni20 Nickel-Chromium alloy wire
Product Description
The Nickel-Chromium alloy wires are widely used as the high resistance alloy for electrical heating and wire-wound resistors in metallurgical industry，chemical industry and electrical industry, etc. This alloy wire has higher electrical resistance coefficient, good anti-oxidation and anti-corrosion performance, and it also has good mechanical workability and weldability, with a high strength at high temperature.
| Main characteristics of Ni-Cr and Ni-Cr-Fe electric heating alloys |
| Type | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni80 | Cr20Ni30 | Cr25Ni20 | |
| Performance | |||||||
| Main Chemical composition | Ni | Rest | 55.0-61.0 | 34.0-37.0 | Rest | 30.0-30.4 | 19.0-22.0 |
| Cr | 28.0-31.0 | 15.0-18.0 | 18.0-21.0 | 20.0-23.0 | 18.0-21.0 | 24.0-26.0 | |
| Fe | ≤ 1.0 | Rest | Rest | ≤ 1.0 | Rest | Rest | |
| Max. continuous service temp. of element | 1250 | 1150 | 1100 | 1200 | 1100 | 1050 | |
| Resistivity at 20℃ （ μΩ m） | 1.18±0.05 | 1.12±0.05 | 1.04±0.05 | 1.09±0.05 | 1.06±0.05 | 0.95±0.05 | |
| Density（g/cm³) | 8.10 | 8.20 | 7.90 | 8.40 | 7.90 | 7.15 | |
| Thermal conductivity (KJ/m h ℃) | 45.2 | 45.2 | 43.5 | 60.3 | 43.8 | 43.8 | |
| Coefficient of lines expansion(αx10-6/℃ ) | 17.0 | 17.0 | 19.0 | 18.0 | 19.0 | 19.0 | |
| Melting point(αpprox.) (℃ ) | 1380 | 1390 | 1390 | 1400 | 1390 | 1400 | |
| Elongation at rupture(%) | ＞ 20 | ＞ 20 | ＞ 20 | ＞ 20 | ＞ 20 | ＞ 20 | |
| Micrographic structure | austenite | austenite | austenite | austenite | austenite | austenite | |
| Magnetic properties | nonmagnetic | Low-magnetic | Low-magnetic | nonmagnetic | Low-magnetic | nonmagnetic | |
Note:The various grades of electric resistance alloy material are blended with the amount of rare earth, titanium and other trace elements, to improve the processing performance and extend the period of the uselife.