Common trade names: NiCr 30 20, Ni30Cr20, Nichrome 30/20, Resistohm 30.
NiCr 30 20 (Werkstoff Nr 1.4860) can be used at operating temperature up to 1080°C. Nickel-Chromium alloy 30/20 is especially characterized by high resistivity and relatively low prices when compared with other Nickel-Chromium alloys. In spite of its relatively high iron content, NiCr 30 20 is resistant to oxidation and chemical corrosion. It is a non-magnetic alloy.
Chemical composition
| Iron Fe Bal. | Nickel Ni 28.0-30.0% | Chromium Cr 18.0-22.0% | Silicon Si 1.8-3.0% | Manganese Mn 1.0% | Carbon C 0.1% | Cupper Cu 0.4% | Aluminium Al 0.2% |
Physical properties
| Density at Room°C |
Coeff of Linear Expansion b/w 20-1000°C 10-6/K |
Electrical Resistivity at 20°C |
Melting Point °C |
Max Continuous Operating Temperature in Air °C |
Magnetic Properties |
| 7.90 g/cm3 | 19 | 1.04 µΩ-cm | 1380 | 1080 | The material is Non-Magnetic |
Mechanical properties
| Tensile Strength N/mm2 |
Yield Strength (daN/mm²) |
Hardness (HV) |
Elongation (A% on 100 mm) |
| 700-800 | 35 | 205 | 28-30 |
Product forms
| Product | Size (mm) | Condition of Supply |
| Wire | 0.2 – 12.0 | Bright Annealed Oxidized |
| Bar | 5.0 – 60.0 | Hot Finished Cold Finished Peeled Bright Turned Bright Annealed |
| Strip | Thickness 2.5 – 5.0 Width 20 – 100 |
Cold Finished Bright Annealed |
| Ribbon | Thickness 0.2 – 1.0 Width 2.0 – 4.5 |
Bright Annealed Flat Rolled |
| Stranded Wire | 2.5 – 3.0 | Hard Annealed |
Application
NiCr 30 20 is suitable for a large variety of domestic heating applications, and particularly when usage temperature is not too high and that cost is a vital factor. It has good ductility after long time usage, good mechanical property at high temperature and good weldability. Its high temperature coefficient allows it a quicker rise in temperature than the other NiCr Alloys. This alloy is very similar to NiCr 40 20 but with a little lower resistivity which imposes a maximum operating temperature of 1080o C and a higher ventilation as for NiCr 40 20.
- Heating accumulators.
- Electric heating elements (Electric blankets and pads, car seats, baseboard heaters, floor heaters, resistors).
- Industrial furnaces up to 1080°.
- Heating cables, rope heaters in defrosting and de-icing elements.