Kanthal® AF

StripDatasheet

Datasheet updated 2024-09-05 12:00 (supersedes all previous editions)

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 strip 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.

Typical applications for Kanthal^® AF strip are as electrical heating elements in industrial furnaces.

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

Thickness	Yield strength	Tensile strength	Elongation	Hardness
	R_p0.2	R_m	A
mm	MPa	MPa	%	Hv
2.0	470	650	20	230

Mechanical properties at elevated temperature
Temperature °C	900	1000	1100	1200	1300
MPa	37	20	12	6	4

Ultimate tensile strength - deformation rate 6.2 x 10 -2 min -1

Creep strength - 1% elongation in 1000 h
Temperature °C	1100	1200
MPa	0.7	0.3

Physical properties

Density g/cm³	7.15
Electrical resistivity at 20°C Ω mm²/m	1.39
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
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	Thermal Expansion x 10^-6/ K
20 - 250	11
20 - 500	12
20 - 750	14
20 - 1000	15

Thermal Conductivity
Temperature °C	20	600	800	1000	1200
W m^-1 K^-1	11	20	22	26	27

Specific heat capacity
Temperature °C	20	200	400	600	800	1000	1200
kJ kg^-1 K^-1	0.46	0.56	0.63	0.75	0.71	0.72	0.74

Melting point °C	1500
Max continuous operating temperature in air °C	1300
Magnetic properties	The material is magnetic up to approximately 600°C (Curie point).
Emissivity - fully oxidized material	0.70