Kanthal APM is an advanced powder-metallurgical, dispersion-strengthened, ferritic iron-chromium-aluminium alloy (FeCrAl alloy) with exceptionally good form stability and oxidation resistance. It is suitable for furnace temperatures up to 1250°C (2282°F).
The alloy offers a unique combination of excellent oxidation properties and form stability at high temperatures. Kanthal APM forms an excellent, non-scaling surface oxide, which gives good protection in most furnace environments, i.e. oxidizing, sulpidizing and carburizing gas, as well as against deposits of carbon, ash, etc.
Typical applications for Kanthal APM are in high-temperature structural parts in furnaces such as mesh belts, loaders, mounting systems for elements or insulation and loading baskets.
Chemical composition
|
C % |
Si % |
Mn % |
Mo % |
Cr % |
Al % |
Fe % |
| Nominal composition |
0.08 |
- |
- |
3.0 |
21.0 |
5.0 |
Balance |
| Min |
|
0.7 |
0.4 |
|
20.5 |
- |
|
| Max |
|
|
|
|
23.5 |
- |
|
Mechanical properties
Wire size
Ø |
Yield strength
Rp0.2 |
Tensile strength
Rm |
Elongation
A |
Hardness
|
| mm |
MPa |
MPa |
% |
HV |
| 4.0 |
470 |
680 |
20 |
230 |
Mechanical properties at elevated temperature
| Temperature °C |
900 |
1000 |
1100 |
1200 |
1300 |
| MPa |
40 |
23 |
16 |
12 |
9 |
Ultimate tensile strength - deformation rate 6.2 x 10-2/min
Creep strength - 1% elongation in 1000 h
| Temperature °C |
800 |
900 |
| MPa |
8.2 |
3.5 |
Creep strength - 0.1% elongation in 1000 h
| Temperature °C |
1100 |
1200 |
1300 |
1400 |
| MPa |
2.3 |
1.2 |
0.7 |
0.4 |
Creep rupture strength
| Time |
800°C / 1472°F
|
1000°C / 1832°F
|
1200°C / 2192°F
|
1400°C / 2552°F
|
| h |
MPa |
psi |
MPa |
psi |
MPa |
psi |
MPa |
psi |
| 100 |
15.0 |
2176 |
5.6 |
812 |
3.3 |
478 |
1.3 |
189 |
| 1000 |
11.3 |
1640 |
3.4 |
478 |
1.6 |
232 |
0.5 |
72 |
| 10000 |
8.2 |
1190 |
2.2 |
320 |
0.7 |
100 |
0.2 |
30 |
The data in the tables apply to material with fine grain structure in the temperature range from 800°C to 900°C, and to material with coarse grain structure in the temperature range from 1100°C to 1400°C.
In the delivery state KANTHAL APM always has a fine grain structure. After use for a certain period of time, the grain size becomes coarse.
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 |
| 20-1200 |
16 |
| 20-1400 |
16 |
Thermal conductivity
| Temperature °C |
50 |
600 |
800 |
1000 |
1200 |
1400 |
| W/(m K) |
11 |
20 |
22 |
26 |
27 |
35 |
Specific heat capacity
| Temperature °C |
20 |
200 |
400 |
600 |
800 |
1000 |
1200 |
1400 |
| kJ/(kg K) |
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 |
1425 |
| Magnetic properties |
The material is magnetic up to approximately 600°C (Curie point) |
| Emissivity - fully oxidized material Ɛ |
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 09:23:44 (supersedes all previous editions)
