What is "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 at temperatures 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

Electrical resistivity

0.706 µΩ m

Mechanical properties

Elongation at break

<44%

Izod impact strength

108 J m

Modulus of elasticity

186 GPa

Tensile strength

620–780 MPa

Physical properties

Density

8.5 g cm

Melting point

1420 °C

Thermal properties

Coefficient of thermal expansion

12.8×10 K at 20–1000 °C

Maximum use temperature in air

1100 °C

Thermal conductivity

19 W m K at 23 °C