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Alkrothal 3 (Strip)

Datasheet updated 2012-06-20 14:09:36 (supersedes all previous editions)

Alkrothal 3 is a ferritic iron-chromium-aluminium alloy (FeCrAl alloy) for use at temperatures up to 1000°C (1830°F).

Typical applications for Alkrothal 3 are in rheostats, braking resistors, etc. It is also used as electrical heating elements in industrial applications.

Chemical composition

C % Si % Mn % Cr % Al % Fe %
Nominal composition 3.2 Bal.
Min - - - 12.0 -
Max 0.08 0.7 0.5 14.0 -

Mechanical properties

Thickness Yield strength
Tensile strength
Elongation
Hardness
Rp0.2 Rm A
mm MPa MPa % Hv
1.0-3.0 350 500 20 200
Mechanical properties at elevated temperature
Temperature °C 900
MPa 30

Ultimate tensile strength - deformation rate 6.2 x 10-2 / min

Creep strength - 1% elongation in 1000 h
Temperature °C 800 1000
MPa 4 1

Physical properties

Density g/cm3 7.35
Electrical resistivity at 20°C Ω mm2/m 1.12
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
Ct 1.02 1.03 1.04 1.07 1.09 1.12 1.15 1.17 1.18 1.19

Coefficient of thermal expansion
Temperature °C Thermal Expansion x 10-6/ K
20 - 250 11
20 - 500 12
20 - 750 14
20 - 1000 15

Thermal Conductivity
Temperature °C 20
W m-1 K-1 16

Specific heat capacity
Temperature°C 20 200 400 600 800 1000
kJ kg-1 K-1 0.46 0.63 0.72 1.00 0.80 0.73

Melting point °C 1500
Max continuous operating temperature in air °C 1000
Magnetic properties The material is magnetic up to approximately 600°C (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 Kanthal materials.

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