Kanthal® APM Construction Matieral 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 construction material has an excellent, non-scaling surface oxide, which gives good protection in most furnace environments, i.e. oxidizing, sulphidizing 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 % |
Cr % |
Al % |
Fe % |
| Nominal composition |
- |
- |
- |
- |
5.8 |
Balance |
| Min |
- |
- |
- |
20.5 |
- |
|
| Max |
0.08 |
0.7 |
0.4 |
23.5 |
- |
|
Mechanical properties
Wire size
Ø |
Yield strength
Rp0.2 |
Tensile strength
Rm |
Elongation
A |
Hardness |
| mm (in.) |
MPa (ksi) |
MPa (ksi) |
% |
HV |
| 4.0 (0.157) |
470 (68) |
680 (99) |
20 |
230 |
Mechanical properties at elevated temperature
| Temperature °C (°F) |
900 (1652) |
1000 (1832) |
1100 (2012) |
1200 (2192) |
1300 (2372) |
| MPa (psi) |
40 (5800) |
23 (3335) |
16 (2320) |
12 (1740) |
9 (1305) |
Ultimate tensile strength - deformation rate 6.2 x 10-2/min
Creep strength - 1% elongation in 1000 h
| Temperature °C (°F) |
800 (1472) |
900 (1652) |
| MPa (psi) |
8.2 (1189) |
3.5 (508) |
Creep strength - 0.1% elongation in 1000 h
| Temperature °C (°F) |
1100 (2012) |
1200 (2192) |
1300 (2372) |
1400 (2552) |
| MPa (psi) |
2.3 (333) |
1.2 (174) |
0.7 (102) |
0.4 (58) |
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 (1472 - 1652°F), and to material with coarse grain structure in the temperature range from 1100°C to 1400°C (2012°F to 2552°F).
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 (lb/in3) |
7.10 (0.26) |
| 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
| Temp. °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 |
