Chromel

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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 (chromel-constantan) and K (chromel-alumel) thermocouples. It can be used up to 1100 °C in oxidizing atmospheres. Chromel is a registered trademark of Concept Alloys, Inc.

Characteristics and properties of chromel (90%-10% Ni-Cr)
CHARACTERISTICS:
Temperature coefficient 0.00032 K−1
Electrical resistivity 0.706 µΩ m
Mechanical properties
Elongation at break <44%
Izod impact strength 108 J m−1
Modulus of elasticity 186 GPa
Tensile strength 620–780 MPa
Physical properties
Density 8.5 g cm−3
Melting point 1420 °C
Thermal properties
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[edit]

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[edit]

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.

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