Kanthal® APM and Kanthal APMT FeCrAl alloys

Kanthal® APM and Kanthal® APMT iron-chromium-aluminium (FeCrAl) alloys can be used at tube temperatures up to 1250°C (2282°F). They offer several advantages compared to other tube materials such as alumina, silicon carbide and nickel-chromium (NiCr) alloys.

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Comparison of Kanthal APMT tube vs. Fe-35Ni-25Cr (after 2300h at 1100°C (2010°F)). The FeNiCr tube is severely contaminated with oxide flakes.

User benefits include superior resistance to, for example, carburization, thermal shock, sagging and distortion. This is due to the materials' excellent mechanical properties* and their capability of forming a dense and adherent oxide film that protects against corrosion and atmospheric attack.

The service life of Kanthal® APM and Kanthal® APMT furnace tubes is often many times longer than that of nickel-chromium (NiCr) alloy-based tubes.

Comparison of carburization resistance

Main characteristics of Kanthal APM and Kanthal APMT FeCrAl alloys

  • Excellent form stability
  • Excellent corrosion resistance in most atmospheres
  • High thermal conductivity
  • No scaling and impurities
  • Longer tube life

Radiant tubes in Kanthal® APM and Kanthal® APMT are available from stock in many sizes. View stock standard sizes and tolerances

* Kanthal APMT offers higher hot strength than Kanthal APM which makes the grade even more resistant to sagging.

Material data

Grade Maximum temperature 1) Rkm 10000 2)
Kanthal APM 1250°C (2280°F) 0.9

Kanthal APMT

1250°C (2280°F) 3.5

1) The material can withstand temperatures up to 1425°C (2600°F). The table shows recommended maximum tube temperature.

2) Creep rupture strength 10000 h MPa (N/mm2) at 1100°C (2010°F).