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Ni-Cr and Ni-Cr-Fe electric heating alloys
Nichrome electric heating alloys with high and stable resistance, corrosion resistance, surface oxidation resistance is good, a better under high temperature and seismic strength, good ductility, good workability and weldability.
It is widely used in industrial electric furnace, metallurgy, household appliances, machinery manufacturing, heating element and resistor varistor other material.
| 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 (ºC) | 1200 | 1250 | 1150 | 1100 | 1100 | |
| Resistivity at 20ºC (μΩ·m) | 1.09 | 1.18 | 1.12 | 1 | 1.04 | |
| Density (g/cm3) | 8.4 | 8.1 | 8.2 | 7.9 | 7.9 | |
| Thermal conductivity (KJ/m·h·ºC) | 60.3 | 45.2 | 45.2 | 43.8 | 43.8 | |
| Coefficient of lines expansion (α×10-6/ºC) | 18 | 17 | 17 | 19 | 19 | |
| 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 | Weak magnetic | Weak magnetic | Weak magnetic | |
Round wire: diameter 0.03mm-10.0mm
Flat wire: thickness 0.2mm-1.0mm, width 0.08mm-40.0mm
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