Chemical composition and properties of FeCrAl alloys:
The chemical composition in w-% of different FeCrAl alloys is shown in the table below;
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| Trade Mark | % Cr | % Al | Other additions | Scaling temp in air, at constant temperature, degrees C (F) |
| Kanthal APM | 22 | 5.8 | 1425(2600F) | |
| Kanthal A-1 | 22 | 5.8 | 1400(2550F) | |
| Kanthal AF | 22 | 5.3 | Y | 1300(2370F) |
|
Kanthal D |
22 | 4.8 | 1300(1300F) | |
| Alkrothal | 15 | 4.3 | 1100(2010F) |
The high aluminum content, in combination with the high chromium content causes the scaling temperature to increase up to 1425 C (2600F ); Under the headline heat resistance, these FeCrAl alloys are compared with commonly used Fe and Ni base alloys. As can be seen from that table, the FeCrAl alloys have superior properties as compared to the other alloys.
It should be noted that, during alternating temperature conditions, the yttrium addition to the AF alloy improves the adherence of the protecting oxide, making the service life of components in the AF alloy longer than that of the A-1 grade.
Kanthal APM-a ferritic super alloy!
Kanthal APM is manufactured by powder metallurgy, which increases the high temperature strength quite substantially. Kanthal APM can therefore be used also in applications where a high temperature strength (creep strength) is of importance. Thus, Kanthal APM is a ferritic super alloy.
Product forms and availability
These FeCrAl alloys are available as wire, strip, welded and seamless tubes; All these product forms are available from stock for fast deliveries.
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