Radiant tubes with long service lives

Radiant tubes are exposed to corrosive furnace atmospheres at high temperatures; Depending on the service temperature and the furnace atmosphere, different heat resistant materials are used.

Thermalloys supplies radiant tubes in the following heat resistant alloys:

• Kanthal APM; Has the best oxidation resistance of all commercial Fe and Ni base alloys, except in cracked ammonia.. Is suitable as:
  

  • Flame tubes in U-, W-, P– och tridenttubes, as well as in straight tubes.

  • Inner tubes in radiant tubes for recuperative burners.

• 25Cr20Ni (AISI 310), 253MA, (S30815), Alloy 800HT och Alloy 600.
  While the 310 and 253MA alloys are used to a large extent when wrought material is specified, the 800HT and Alloy 600 alloys are used under nitriding conditions. Which one is selected also depends on availability and price; These material are in general used at lower temperatures and less corrosive atmospheres than Kanthal APM.

• Coated tubes; When no alloy has a sufficient oxidation resistance, Thermalloys has developed a procedure for coating the radiant tubes, to substantially increase the service life.

Tube sizes; Dependent on the alloy, tubes are available in the size range, OD x wt: 79x3 mm (3.11x0.12 inch) to 248x5 mm. (9.76x0.20 inch)

Smaller and larger sizes can be supplied on request.