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Chromel is an alloy made of approximately 90 percent nickel and 10 percent chromium that is used to make the positive conductors of ANSI Type E and K thermocouples. It can be used up to 1100°C in oxidising atmospheres. Chromel is a registered trademark of the Hoskins Manufacturing Company. In thermocouples, chromel is often used together with alumel.
| CHARACTERISTICS: | |
|---|---|
| Temperature coefficient ( K-1 ) | 0.00032 |
| Electrical resistivity ( µΩ cm ) | 70.6 |
| Mechanical Properties | |
| Elongation at break ( % ) | <44 |
| Izod impact strength ( J m-1 ) | 108 |
| Modulus of elasticity ( GPa ) | 186 |
| Tensile strength ( MPa ) | 620-780 |
| Physical Properties | |
| Density ( g cm-3 ) | 8.5 |
| Melting point ( °C ) | 1420 |
| Thermal Properties | |
| Coefficient of thermal expansion ( x10-6 K-1 ) | 17.2 at 20-1000 °C |
| Maximum use temperature in air ( °C ) | 1100 |
| Thermal conductivity ( W m-1 K-1 ) | 19 at 23 °C |
Chromel A is an alloy containing 80% of nickel and 20% chromium (by weight). It is used for its excellent resistance to high-temperature corrosion and oxidation.
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