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Kanthal APM, construction materials (Construction materials)

Datasheet updated 2012-06-20 09:23:44 (supersedes all previous editions)

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.

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