Nikrothal 40 is an austenitic nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1100°C (2010°F). The alloy is characterized by high resistivity and good oxidation resistace. It has good ductility after use and excellent weldability.
Typical applications for Nikrothal 40 are night-storage heaters, convection heaters, heavy duty rheostats and fan heaters. The alloy is also used for heating cables and rope heaters in defrosting and de-icing elements, electric blankets and pads, car seats, baseboard heaters and floor heaters, resistors.
Chemical composition
|
C % |
Si % |
Mn % |
Cr % |
Ni % |
Fe % |
| Nominal composition |
|
|
|
|
|
Bal. |
| Min |
- |
1.6 |
- |
18.0 |
34.0 |
|
| Max |
0.10 |
2.5 |
1.0 |
21.0 |
37.0 |
|
Mechanical properties
| Wire size |
Yield strength |
Tensile strength |
Elongation |
Hardness |
| Ø |
Rp0.2 |
Rm |
A |
|
| mm |
MPa |
MPa |
% |
Hv |
| 1.0 |
340 |
675 |
35 |
180 |
| 4.0 |
300 |
650 |
30 |
160 |
Mechanical properties at elevated temperature
| Temperature °C |
800 |
900 |
1000 |
| MPa |
170 |
95 |
58 |
Ultimate tensile strength - deformation rate 5.0 x 10-2/min
Creep strength - 1% elongation in 1000 h
| Temperature °C |
800 |
1000 |
| MPa |
20 |
4 |
Physical properties
| Density g/cm3 |
7.90 |
| Electrical resistivity at 20°C Ω mm2/m |
1.04 |
Temperature factor of resistivity
| Temperature°C |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
1100 |
| Ct |
1.03 |
1.06 |
1.10 |
1.12 |
1.15 |
1.17 |
1.19 |
1.21 |
1.22 |
1.23 |
1.24 |
Coefficient of thermal expansion
| Temperature °C |
Thermal Expansion x 10-6/K |
| 20 - 250 |
16 |
| 20 - 500 |
17 |
| 20 - 750 |
18 |
| 20 - 1000 |
19 |
Thermal conductivity
| Temperature °C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
1100 |
| W m-1 K-1 |
13 |
14 |
15 |
16 |
18 |
19 |
21 |
22 |
24 |
25 |
26 |
28 |
Specific heat capacity
| Temperature °C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
1100 |
| kJ kg-1 K-1 |
0.50 |
0.50 |
0.50 |
0.51 |
0.54 |
0.57 |
0.60 |
0.62 |
0.64 |
0.67 |
0.70 |
0.73 |
| Melting point °C |
1390 |
| Max continuous operating temperature in air °C |
1100 |
| Magnetic properties |
The material is non-magnetic |
| Emissivity - fully oxidized material |
0.88 |
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 2012-06-20 14:35:05 (supersedes all previous editions)
