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