Kanthal® AE is a ferritic iron-chromium-aluminium alloy (FeCrAl alloy) with exceptional form stability and service life in elements with large coil to wire diameter ratio. It is suitable for use at temperatures up to 1300ºC (2370ºF).
Kanthal® AE has been developed for conditions of extreme surface loads in fine wire dimensions. It contains trace elements which provides for an extremely well adhering oxide with good emissivity properties.
Typical applications for Kanthal® AE are in fast-response elements for ceramic glass top hobs and quartz tube heaters. Due to the dense and well adhering oxide, the alloy is also suitable for applications using close wound coils.
Chemical composition
|
C % |
Si % |
Mn % |
Cr % |
Al % |
Fe % |
| Nominal composition |
|
|
|
|
5.3 |
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 (in) |
MPa (ksi) |
MPa (ksi) |
% |
Hv |
| 1.0 (0.04 |
520 (75) |
720 (104) |
20 |
230 |
Mechanical properties at elevated temperature
| Temperature °C (°F) |
900 (1652) |
| MPa (ksi) |
34 (4.9) |
Ultimate tensile strength - deformation rate 6.2 x 10-2/min
Creep strength - 1% elongation in 1000 h
| Temperature °C (°F) |
800 (1472) |
| MPa (psi) |
1.2 (170) |
Physical properties
| Density g/cm3 (lb/in3) |
7.15 (0.258) |
| Electrical resistivity at 20°C Ω mm2/m (Ω circ. mil/ft) |
1.39 (836) |
| Poisson's ratio |
0.30 |
Young's modulus
| Temperature °C |
20 |
100 |
200 |
400 |
600 |
800 |
1000 |
| Temperature °F |
68 |
212 |
392 |
752 |
1112 |
1472 |
1832 |
| GPa |
220 |
210 |
205 |
190 |
170 |
150 |
130 |
| Msi |
32 |
30 |
30 |
28 |
25 |
22 |
19 |
Temperature factor of resistivity
| Temperature °C |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
1100 |
1200 |
1300 |
| Temperature °F |
212 |
392 |
572 |
752 |
932 |
1112 |
1292 |
1472 |
1652 |
1832 |
2012 |
2192 |
2372 |
| Ct |
1.00 |
1.01 |
1.01 |
1.02 |
1.03 |
1.04 |
1.04 |
1.05 |
1.05 |
1.06 |
1.06 |
1.06 |
1.06 |
Coefficient of thermal expansion
| Temperature °C (°F) |
Thermal Expansion x 10-6/K (10-6 /°F) |
| 20 - 250 (68-482) |
11 (6.1) |
| 20 - 500 (68-932) |
12 (6.7) |
| 20 - 750 (68-1382) |
14 (7.8) |
| 20 - 1000 (68-1832) |
15 (8.3) |
Thermal conductivity
| Temperature °C |
50 |
600 |
800 |
1000 |
1200 |
| Temperature °F |
122 |
1112 |
1472 |
1832 |
2192 |
| W m-1 K-1 |
11 |
20 |
22 |
26 |
27 |
| Btu h-1ft-1°F-1 |
6.4 |
11.6 |
12.7 |
15.0 |
15.6 |
Specific heat capacity
| Temperature °C |
20 |
200 |
400 |
600 |
800 |
1000 |
1200 |
| Temperature °F |
68 |
392 |
752 |
1112 |
1472 |
1832 |
2192 |
| kJ kg-1 K-1 |
0.46 |
0.56 |
0.63 |
0.75 |
0.71 |
0.72 |
0.74 |
| Btu lb-1 °F-1 |
0.11 |
0.13 |
0.15 |
0.18 |
0.17 |
0.17 |
0.18 |
| Melting point °C (°F) |
1500 (2732) |
| Max continuous operating temperature in air °C (°F) |
1300 (2372) |
| Magnetic properties |
The material is magnetic up to approximately 600°C (1112°F) (Curie point). |
| Emissivity - fully oxidized material |
0.70 |
Maximum permissible wire temperature versus coil to wire diameter ratio in supported elements of KANTHAL AE
Temperature measured 15 min. from start
