Nickel Chromium Alloy 40 Resistance Ribbon Ni40cr20 Electric Heater Wire
Nickel Chromium Resistance Alloy Resistohm 40 Resistance Ribbon Ni40cr20 electric heater Wire
Ni40Cr20 is an austenitic nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1100°C (2010°F). The alloy is characterized by high resistivity and good oxidation resistance. It has good ductility after use and excellent weldability.
Typical applications for Ni40Cr20 are night-storage heaters, convection heaters, heavy duty rheostats and fan heaters. The alloy is also used for heating cables and rope heaters in defrosting and de-icing elements, electric blankets and pads, car seats, baseboard heaters and floor heaters, resistors.
CHEMICAL COMPOSITION
| C% | Si% | Mn% | Cr% | Ni% | Fe% | |
| Nominal Composition | Bal. | |||||
| Min | - | 1.6 | - | 18.0 | 34.0 | |
| Max | 0.10 | 2.5 | 1.0 | 21.0 | 37.0 |
MECHANICAL PROPERTIES
| Wire Size | Yield strength | Tensile strength | Elongation | Hardness |
| Ø | Rρ0.2 | Rm | A | |
| mm | Mpa | MPa | % | Hv |
| 1.0 | 340 | 675 | 25 | 180 |
| 4.0 | 300 | 650 | 30 | 160 |
PHYSICAL PROPERTIES
| Density g/cm3 | 7.90 |
| Electrical resistivity at 20°C Ω mm /m | 1.04 |
| Maximum use temperature °C | 1100 |
| Melting point °C | 1390 |
| Magnetic Property | Non-Magnetic |
TEMPERATURE FACTOR OF RESISTIVITY
| Temperature °C | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | 1100 |
| Ct | 1.03 | 1.06 | 1.10 | 1.112 | 1.15 | 1.17 | 1.19 | 1.04 | 1.22 | 1.23 | 1.24 |
COEFFICIENT OF THERMAL EXPANSION
| Temperature °C | Thermal Expansion x 10-6/K |
| 20-250 | 16 |
| 20-500 | 17 |
| 20-750 | 18 |
| 20-1000 | 19 |
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