Main characteristics of Ni-Cr and Ni-Cr-Fe electric heating alloys Cr20Ni80 Cr30Ni70 Cr15Ni60 Cr20Ni35 Cr20Ni30
| Alloy Nomenclature /Performance | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 | |
| Main Chemical composition | Ni | Rest | Rest | 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 | Rest | Rest | Rest | |
Max. continuous service temp. of element | 1200 | 1250 | 1150 | 1100 | 1100 | |
Resistivity at 20oC (μΩ·m) | 1.09 | 1.18 | 1.12 | 1.0 | 1.04 | |
Density (g/cm3) | 8.40 | 8.10 | 8.20 | 7.90 | 7.90 | |
Thermal conductivity | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 | |
Coefficient of lines expansion | 18.0 | 17.0 | 17.0 | 19.0 | 19.0 | |
Melting point (approx.)( oC) | 1400 | 1380 | 1390 | 1390 | 1390 | |
Elongation at rupture (%) | >20 | >20 | >20 | >20 | >20 | |
Micrographic structure | austenite | austenite | austenite | austenite | austenite | |
Magnetic properties | nonmagnetic | nonmagnetic | nonmagnetic | Weak magnetic | Weak magnetic | |
