Nikrothal® 80 is an austenitic nickel-chromium alloy (NiCr alloy) for use at temperatures up to 1200°C (2190°F). The alloy is characterized by high resistivity, good oxidation resistance and very good form stability. It has good ductility after use and excellent weldability.
Nikrothal® 80 is used for electric heating elements in home appliances and industrial furnaces. Typical applications are flat irons, ironing machines, water heaters, plastic moulding dies, soldering irons, metal sheathed tubular elements and cartridge elements.
Due to extremely good adhesion properties of the surface oxide, Nikrothal® 80 offers superior service life compared to competitive nickel-chromium alloys.
Chemical composition
|
C % |
Si % |
Mn % |
Cr % |
Fe % |
Ni % |
Trace elements |
| Nominal Composition |
|
|
|
|
|
Bal |
Added |
| Min |
- |
1.0 |
- |
19.0 |
- |
- |
- |
| Max |
0.10 |
1.7 |
1.0 |
21.0 |
2.01) |
- |
- |
1) Fe < 1.0 % on request
Mechanical properties
| Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Hardness |
|
Rp0.2 |
Rm |
A |
|
| mm |
MPa |
MPa |
% |
Hv |
| 0.40 |
365 |
780 |
35 |
180 |
Mechanical properties at elevated temperature
| Temperature °C |
900 |
| MPa |
100 |
Ultimate tensile strength - deformation rate 6.2 x 10 -2 min -1
Creep strength - 1% elongation in 1000 h
| Temperature °C |
800 |
1000 |
| MPa |
15 |
4 |
Physical properties
| Density g/cm3 |
8.30 |
|---|
| Electrical resistivity at 20°C Ω mm2/m |
1.09 |
|---|
Temperature factor of resistivity
| Temperature °C | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | 1100 | 1200 |
|---|
| Ct |
1.01 |
1.02 |
1.03 |
1.04 |
1.04 |
1.04 |
1.04 |
1.04 |
1.04 |
1.05 |
1.06 |
1.07 |
|---|
Coefficient of thermal expansion
| Temperature °C | Thermal Expansion x 10-6/ K |
|---|
| 20 - 250 |
14.1 |
| 20 - 500 |
14.9 |
| 20 - 750 |
16.0 |
| 20 - 1000 |
17.2 |
Thermal Conductivity
| Temperature °C | 20 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | 1100 |
|---|
| W m-1 K-1 |
15 |
15 |
15 |
15 |
17 |
19 |
21 |
22 |
24 |
26 |
28 |
30 |
|---|
Specific heat capacity
| Temperature °C | 20 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 1000 | 1100 |
|---|
| kJ kg-1 K-1 |
0.46 |
0.46 |
0.48 |
0.50 |
0.52 |
0.54 |
0.56 |
0.60 |
0.63 |
0.65 |
0.67 |
0.70 |
|---|
| Melting point °C |
1400 |
|---|
| Max continuous operating temperature in air °C |
1200 |
|---|
| Magnetic properties |
The material is non-magnetic. |
|---|
| Emissivity - fully oxidized material |
0.88 |
|---|
