Chromel is an alloy made of approximately 90% nickel and 10% chromium by weight that is used to make the positive conductors of ANSI Type E (chromel-constantan) and K (chromel-alumel) thermocouples. It can be used at temperatures up to 1,100 °C (2,010 °F) in oxidizing atmospheres. Chromel is a registered trademark of Concept Alloys, Inc.[1]
| Characteristic | Value |
|---|---|
| Temperature coefficient | 0.00032 K−1 |
| Electrical resistivity | 0.706 μΩ m |
| Mechanical | |
| Elongation at break | <44% |
| Izod impact strength | 108 J m−1 |
| Modulus of elasticity | 186 GPa |
| Tensile strength | 620–780 MPa |
| Physical | |
| Density | 8.5 g cm−3 |
| Melting point | 1420 °C |
| Thermal | |
| Coefficient of thermal expansion | 12.8×10−6 K−1 at 20–1000 °C |
| Maximum use temperature in air | 1100 °C |
| Thermal conductivity | 19 W m−1 K−1 at 23 °C |