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 materials under the trademark Kanthal®.
Kanthal® AF wire is a ferritic iron-chromium-aluminium alloy (FeCrAl alloy) for use at temperatures up to 1300°C (2370°F). The alloy is characterized by excellent oxidation resistance and very good form stability resulting in long element life.
Kanthal® AF is typically used in electrical heating elements in industrial furnaces and home appliances.
Example of applications in the appliance industry are in open mica elements for toasters, hair dryers, in meander shaped elements for fan heaters and as open coil elements on fibre insulating material in ceramic glass top heaters in ranges, in ceramic heaters for boiling plates, coils on molded ceramic fibre for cooking plates with ceramic hobs, in suspended coil elements for fan heaters, in suspended straight wire elements for radiators, convection heaters, in porcupine elements for hot air guns, radiators, tumble dryers.
C %
Si %
Mn %
Cr %
Al %
Fe %
†Nominal composition
5.3
Bal.
Min
-
-
-
20.5
-
Max
0.08
0.7
0.4
23.5
-
†Note: Composition listed is nominal. Actual composition may vary to meet standard electrical resistance and dimensional tolerances.
Wire size
Yield strength
Tensile strength
Elongation
Hardness
Ø
Rp0.2
Rm
A
mm (in)
MPa (ksi)
MPa (ksi)
%
Hv
1.0 (0.04)
500 (73)
700 (102)
23
230
4.0 (0.16)
475 (69)
680 (99)
18
230
Mechanical properties at elevated temperature
Temperature °C
900
1000
1100
1200
1300
Temperature °F
1652
1832
2012
2192
2372
MPa
37
20
12
6
4
ksi
5.4
2.9
1.7
0.9
0.6
Ultimate tensile strength - deformation rate 6.2 x 10-2 /min
Creep strength - 1% elongation in 1000 h
Temperature °C
1100
1200
Temperature °F
2012
2192
MPa
0.7
0.3
psi
100
44
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
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 materials under the trademark Kanthal®.
