Radiant tubes for tougher conditions at the burner leg
In some furnaces not all parts of a radiant tube is exposed to extreme temperatures. In these cases, an alternative is to use Kanthal APM or Kanthal APMT iron-chromium-aluminium (FeCrAl) alloy for the burner leg and a nickel-chromium (NiCr) alloy for the bend and the return tube.
Temperature distribution in the all-Kanthal APM or all-Kanthal APMT design and a conventional U-tube design.
Sandvik has delivered radiant tubes with different material combinations since 2008, with excellent result. Contact us for references.