FeCrAl alloy protection tube is different from 304 or 316 stainless steels, stainless steels forms a chromium oxide layer to protect against medium high temperature, while FeCrAl alloys forms a aluminium oxide layer to protect at high temperature.The Al2O3 layer is also more adhesive to the base metal, and with low growth rate, so our FeCrAl protection tubes have longer service life compared with other protection tubes.
FeCrAl alloys
| Grade of alloys | Max Working temperature ℃ | Description |
|---|---|---|
| NW Cr21Al6 | 1300 | with higher aluminium content, good thermal stability and oxidation resistance against high temperature |
| NW Cr25Al5 | 1250 | equivalent to Kanthal AF, with addition of rare earth elements |
Size range
Outer diameter: 4-25mm
Wall thickness: 0.18-2mm