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 (chromel-constantan) and K (chromel-alumel) thermocouples. It can be used up to 1100 °C in oxidizing atmospheres. Chromel is a registered trademark of the Hoskins Manufacturing Company.
|Temperature coefficient||0.00032 K−1|
|Electrical resistivity||0.706 µΩ m|
|Elongation at break||<44%|
|Izod impact strength||108 J m−1|
|Modulus of elasticity||186 GPa|
|Tensile strength||620–780 MPa|
|Density||8.5 g cm−3|
|Melting point||1420 °C|
|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|
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. It is also commonly called Nichrome 80-20 and used for electric heating elements.
Chromel C is an alloy containing 60% nickel, 16% chromium, and 24% iron. It is also commonly called Nichrome 60 and is used for heating elements, resistance windings, and hot wire cutters.
- Materials properties of thermocouple wires sold by Omega Engineering, Inc.
- Technical information on alloys at Electrovek-Steel Ltd.
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