Chromel

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 oxidising atmospheres. Chromel is a registered trademark of the Hoskins Manufacturing Company.

Characteristics and properties of chromel (90%-10% Ni-Cr)

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

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.