Nikrothal® 30 is an austenitic nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1050°C (1920°F). The alloy is characterized by high resistivity and good oxidation resistance. It has good ductility after use and excellent weldability.
Typical applications for Nikrothal® 30 are solid hot plates, open coil heaters in HVAC systems, night-storage heaters, convection heaters, heavy duty rheostats and fan heaters. Nikrothal® 30 is also used for heating cables and rope heaters in defrosting and de-icing elements, electric blankets and pads, car seats, baseboard heaters, floor heaters and resistors.
Chemical composition
|
C % |
Si % |
Mn % |
Cr % |
Ni % |
Fe % |
Trace Elements |
| Nominal composition |
|
|
|
|
|
Bal. |
Added |
| Min |
|
1.6 |
|
20.0 |
30.0 |
|
|
| Max |
0.15 |
2.5 |
1.0 |
22.0 |
33.0 |
|
|
Mechanical properties
| Wire size |
Yield strength |
Tensile strength |
Elongation |
Hardness |
| Ø |
Rp0.2 |
Rm |
A |
|
| mm |
inch |
MPa |
kpsi |
MPa |
kpsi |
% |
HV |
| 1.0 |
0.04 |
340 |
49.3 |
675 |
97.9 |
35 |
180 |
| 4.0 |
0.16 |
300 |
43.5 |
650 |
94.3 |
30 |
160 |
Mechanical properties at elevated temperature
| Temperature °C |
900 |
| MPa |
72 |
Ultimate tensile strength - deformation rate 5.0 x 10-2/min
Physical properties
| Density |
g/cm3 |
7.80 |
|
lb/in3 |
0.282 |
| Electrical resistivity at 20°C |
Ω mm2/m |
1.03 |
|
Ω/cmf |
620 |
Temperature factor of resistivity
| Temperature °C |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
| Temperature °F |
212 |
392 |
572 |
752 |
932 |
1112 |
1292 |
1472 |
1652 |
1832 |
| Ct-value |
1.03 |
1.07 |
1.11 |
1.14 |
1.17 |
1.19 |
1.21 |
1.23 |
1.24 |
1.26 |
Coefficient of thermal expansion
| Temperature |
Temperature |
Thermal Expansion |
| °C |
°F |
x 10-6/K |
| 20 - 250 |
68 - 482 |
16 |
| 20 - 500 |
68 - 932 |
17 |
| 20 - 750 |
68 - 1382 |
18 |
| 20 - 1000 |
20 - 1832 |
19 |
| Max continuous operating temperature in air |
1050°C |
|
1920°F |
| Magnetic properties |
The material is non-magnetic |
| Emissivity - fully oxidized material |
0.88 |
