Kanthal A-1 is a ferritic iron-chromium-aluminium alloy (FeCrAl alloy) for use at temperatures up to 1400°C (2550°F). The alloy is characterized by high resistivity and very good oxidation resistance.
Typical applications for Kanthal A-1 are electrical heating elements in high-temperature furnaces for heat treatment, ceramics, glass, steel, and electronics industries.
Chemical composition
|
C % |
Si % |
Mn % |
Cr % |
Al % |
Fe % |
| Nominal composition |
|
|
|
|
5.8 |
Bal. |
| Min |
- |
- |
- |
20.5 |
- |
|
| Max |
0.08 |
0.7 |
0.4 |
23.5 |
- |
|
Mechanical properties
| Wire size |
Yield strength |
Tensile strength |
Elongation |
Hardness |
| Ø |
Rp0.2 |
Rm |
A |
|
| mm |
MPa |
MPa |
% |
Hv |
| 1.0 |
545 |
760 |
20 |
240 |
| 4.0 |
475 |
680 |
18 |
230 |
Mechanical properties at elevated temperature
| Temperature °C |
900 |
1000 |
1100 |
1200 |
1300 |
| MPa |
34 |
18 |
10 |
6 |
4 |
Ultimate tensile strength - deformation rate 6.2 x 10-2/min
Creep strength - 1% elongation in 1000 h
| Temperature °C |
800 |
1000 |
| MPa |
1.2 |
0.5 |
Physical properties
| Density g/cm3 |
7.10 |
| Electrical resistivity at 20°C Ω mm2/m |
1.45 |
| Poisson's ratio |
0.30 |
Young's modulus
| Temperature °C |
20 |
100 |
200 |
400 |
600 |
800 |
1000 |
| GPa |
220 |
210 |
205 |
190 |
170 |
150 |
130 |
Temperature factor of resistivity
| Temperature°C |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
1100 |
1200 |
1300 |
1400 |
| Ct |
1.00 |
1.00 |
1.00 |
1.00 |
1.01 |
1.02 |
1.02 |
1.03 |
1.03 |
1.04 |
1.04 |
1.04 |
1.04 |
1.05 |
Coefficient of thermal expansion
| Temperature °C |
Thermal Expansion x 10-6/K |
| 20 - 250 |
11 |
| 20 - 500 |
12 |
| 20 - 750 |
14 |
| 20 - 1000 |
15 |
Thermal conductivity
| Temperature °C |
50 |
600 |
800 |
1000 |
1200 |
1400 |
| W m-1 K-1 |
11 |
20 |
22 |
26 |
27 |
35 |
Specific heat capacity
| Temperature °C |
20 |
200 |
400 |
600 |
800 |
1000 |
1200 |
1400 |
| kJ kg-1 K-1 |
0.46 |
0.56 |
0.63 |
0.75 |
0.71 |
0.72 |
0.74 |
0.80 |
| Melting point °C |
1500 |
| Max continuous operating temperature in air °C |
1400 |
| Magnetic properties |
The material is magnetic up to approximately 600°C (Curie point). |
| Emissivity - fully oxidized material |
0.70 |
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 14:26:08 (supersedes all previous editions)
