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Nicrosil (Thermocouple wire)

Datasheet updated 2013-03-19 10:34:14 (supersedes all previous editions)

Nicrosil is an austenitic nickel-chromium-silicon alloy (NiCrSi alloy) used for the positive leg of thermocouples type N. It offers higher thermoelectric stability in air above 1000°C (1830°F) and a better oxidation resistance in air than type E, J and K thermocouples.

Nicrosil alloy can not be exposed to reducing or alternatively oxidizing and reducing atmospheres or to vacuum. This thermocouple is the most recent one among the different types covered by the international standards.

Chemical composition

Ni % Cr % Si %
Nominal composition Bal. 14.2 1.5

Mechanical properties

Wire size Yield strength Tensile strength Elongation
Ø Rp0.2 Rm A
mm MPa MPa %
2.0 310 800 35

Physical properties

Density g/cm3 8.53
Electrical resistivity at 20°C Ω mm2/m 1.00
Temperature coefficient of resistance between 20°C and 100°C x 10-6/K 90

Coefficient of thermal expansion
Temperature °C Thermal Expansion x 10-6/K
20 - 100 17

Thermal conductivity
Temperature °C 20
W m-1 K-1 13

Melting point °C 1420
Magnetic properties The material is non-magnetic

Recommended maximum continuous operating temperature
Wire size Ø 3.26 1.63 1.00 0.50 0.25
Bare wire °C 1100 1010 960 890 800
Protected wire °C 1250 1180 1110 1000 910

Note that the indicated temperatures should be considered as guide values


Thermoelectric properties

Nominal emf values vs Nisil
Temp °C mV
100 2.774
200 5.913
300 9.341
400 12.974
500 16.748
600 20.613
700 24.527
800 28.455
900 32.371
1000 36.256
1100 40.087
1200 43.846
1300 47.513

ITS 90 - Reference junction 0°C

Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Kanthal materials.

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