After initial sagging, the iron/nickel/chrome material follows a fairly linear behavior with time. In the case of Kanthal APM and APMT alloys, the deformation rate continues to decrease with time.
Kanthal® APMT alloy radiant tubes are extruded from a modified version of Kanthal’s APM iron/chrome/aluminum alloy. Improved form stability minimizes sagging when longer tubes are horizontally mounted. APMT alloy tubes can be used as burner tubes, protective tubes for bayonet elements, and other high temperature operations.
- Resist sagging deformation.
- Up to four times longer life.
- Superior form stability.
- Improved hot strength.
- Ideal for horizontal mounting.
- Operate at higher temperatures.
- Higher furnace loading.
- Excellent corrosion resistance.
- Tubes need not be rotated.
- Resist sulphurous atmospheres.
Electric and gas furnaces where tubes are horizontally mounted, higher temperatures and power ratings are required, and high carbon potential atmospheres are present.
Modified chemistry of the iron/chrome/aluminum APM alloy with a slightly lower aluminum content and 3% molybdenum for improved hot strength and form stability.
2280° F (1250° C).
1.05 in. to 7.8 in. (26.67 mm to 198 mm) O.D.