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 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

[edit] 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.