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Kanthal APMT (Construction materials)

Datasheet updated 2012-05-21 15:29:45 (supersedes all previous editions)

Kanthal APMT is an advanced powder-metallurgical, dispersion-strengthened, ferritic iron-chromium-aluminium alloy (FeCrAl alloy) with an addition of molybdenum. It is suitable for furnace temperatures up to 1250°C (2282°F).

Kanthal APMT offers a unique combination of excellent oxidation properties and form stability at high temperatures. The material 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 APMT 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 3.0 21.0 5.0 Balance
Min - - - 20.5 -
Max 0.08 0.7 0.4 23.5 -

Corrosion resistance

Max recommended continuous operating temperature in air ºC 1250
Protective surface oxide Al2O3

Oxidation rate

Weight gain of Kanthal APMT, due to oxide formation, when oxidized in air at 1200°C for 100h cycles with cooling to ambient temperature between each cycle.

Mechanical properties

Wire dimension
Ø
mm
Yield strength
Rp0.2
MPa
Tensile strength
Rm
MPa
Elongation
A
%
Hardness
Hv
1 730 961 14
4 630 852 19

Remark: The samples are taken in the longitudinal direction from tube in delivery condition.

Mechanical properties at elevated temperature
Temperature °C 600 800 1000 1200
MPa 420 120 42 16

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


Creep strength - 1% elongation in 1000 h
Temperature °C 800 1000 1100 1200
MPa 16 6.5 2.5 1.0

Secondary creep rate at various stress levels
Creep rate Temperature/ Stress
s-1 800°C
MPa
1000°C
MPa
1100°C
MPa
1200°C
MPa
1.0 e-10
1.0 e-8
1.0 e-6
17
23
30
4
7.5
10.3
1.5
3
6
0.5
1.3
3

Creep rupture strength
Time Temperature/ Stress
h 800°C
MPa
1000°C
MPa
1100°C
MPa
1200°C
MPa
100
1000
10000
28
21
18
10
7
5
4
3.2
2
2.8
1.6
0.9

Physical properties

Density g/cm3 7.25
Electrical resistivity at 20°C mm2/m 1.40
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
Coefficient of thermal expansion
Temperature °C 20 - 250 20 - 500 20 - 750 20 - 1000 20 - 1200
CTE x 10-6/K 12.4 13.1 13.6 14.7 15.4

Thermal conductivity
Temperature °C 50 600 800 1000 1200
W/(m K) 11 21 23 27 29

Specific heat capacity
Temperature °C 20 200 400 600 800 1000 1200
kJ/(kg K) 0.48 0.56 0.64 0.71 0.67 0.69 0.70
Melting point °C 1500
Magnetic properties Ferromagnetic, Curie point approximately 600°C.
Emissivity - fully oxidized material Ɛ 0.70
Temperature factor of resistivity
Temperature °C 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300
Ct 1.00 1.00 1.01 1.01 1.01 1.02 1.02 1.02 1.03 1.03 1.03 1.03 1.04

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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