Nicrosil

Thermocouple wireDatasheet

Datasheet updated 2024-09-05 12:06 (supersedes all previous editions)

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 materials under the trademark Kanthal^®.

Nicrosil thermocouple wire 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 thermocouple wire cannot 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	R_p0.2	R_m	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