0.12mm 80/20 Nichrome Wire for Industrial Furnaces
Nickel Chrome (NiCr) alloys are high-resistance materials typically used in applications with maximum operating temperatures up to 1,250°C (2,280°F).
These Austenitic alloys are known for their higher mechanical strength at temperatures compared to FeCrAl alloys as well as their higher creep strength. Nickel Chrome alloys also remain more ductile when compared to FeCrAl alloys after extended periods at temperature. A dark Chromium Oxide (Cr2O3) is formed at high temperatures which is susceptible to spalling, or flaking, causing potential contamination depending on the application. This oxide does not have electrical insulation properties like the Aluminum Oxide (Al2O3) of FeCrA alloys. Nickel Chrome alloys exhibit good corrosion resistance with exception to environments where sulfur is present.
| Grade | Ni80Cr20 | Ni70Cr30 | Ni60Cr23 | Ni60Cr15 | Ni35Cr20 | Karma | Evanohm | |
| Nominal composition% | Ni | Bal | Bal | 58.0-63.0 | 55.0-61.0 | 34.0-37.0 | Bal | Bal |
| Cr | 20.0-23.0 | 28.0-31.0 | 21.0-25.0 | 15.0-18.0 | 18.0-21.0 | 19.0-21.5 | 19.0-21.5 | |
| Fe | ≦1.0 | ≦1.0 | Bal | Bal | Bal | 2.0-3.0 | – | |
| Al1.0-1.7 Ti 0.3-0.5 | Al2.7-3.2 Mn0.5-1.5 | Al2.7-3.2 Cu2.0-3.0 Mn0.5-1.5 | ||||||
| Max operating temp(°C) | 1200 | 1250 | 1150 | 1150 | 1100 | 300 | 400 | |
| Resisivity(Ω/cmf,20℃) | 1.09 | 1.18 | 1.21 | 1.11 | 1.04 | 1.33 | 1.33 | |
| Resisivity(uΩ/m,60°F) | 655 | 704 | 727 | 668 | 626 | 800 | 800 | |
| Density(g/cm³) | 8.4 | 8.1 | 8.4 | 8.2 | 7.9 | 8.1 | 8.1 | |
| Thermal Conductivity(KJ/m·h·℃) | 60.3 | 45.2 | 45.2 | 45.2 | 43.8 | 46.0 | 46.0 | |
| Linear Expansion Coefficient(×10¯6/℃)20-1000℃) | 18.0 | 17.0 | 17.0 | 17.0 | 19.0 | - | - | |
| Melting Point(℃) | 1400 | 1380 | 1370 | 1390 | 1390 | 1400 | 1400 | |
| Hardness(Hv) | 180 | 185 | 185 | 180 | 180 | 180 | 180 | |
| Tensile Strength(N/mm2 ) | 750 | 875 | 800 | 750 | 750 | 780 | 780 | |
| Elongation(%) | ≥20 | ≥20 | ≥20 | ≥20 | ≥20 | 10-20 | 10-20 | |
| Micrographic Structure | austenite | austenite | austenite | austenite | austenite | austenite | austenite | |
| MagneticProperty | Non | Non | Non | Slightly | Non | Non | Non | |
| Fast Life(h/℃) | ≥81/1200 | ≥50/1250 | ≥81/1200 | ≥81/1200 | ≥81/1200 | - | - | |
