Ultra High Temperature Isothermal Furnace Liner (UHT-IFL)

Inconel 600/601 has been the envelope material of choice since the introduction of high temperature IFLs nearly 30 years ago. Inconel 600/601 is a widely available high temperature material, which is compatible with Cesium, Potassium and Sodium and has adequate oxidation resistance and reasonable high temperature creep strength.

ACT's Inconel/Sodium IFLs are rated to 1,100°C for up to 1,000 hours of operation (based on creep strength).

Experience gained from operating IFLs in a variety of applications, coupled with a growing desire to operate IFLs for longer than 1,000 hours at 1,100°C, has indicated a need for more robust, longer life IFLs specifically for use in the range of 1,000 to 1,100°C.

ACT recently introduced a new line of Haynes/Sodium IFLs that can meet this demanding application requirement. The stresses in typical IFLs are in the range of 0.3 to 0.6ksi at 1,100°C (depending on the diameter).

The figure and table below show Haynes 230 has significantly greater creep resistance than Inconel 600/601. While life expectancy is dependent on each application, the data indicate that life expectancy improvements of 2:1 or better could be realized.

Comparison of Stress to Produce
1% Creep in 1000 Hours
(click graph to enlarge)

Stress-Rupture Life for Various
Alloys at Fixed Test Conditions
(click graph to enlarge)

ACT's UHT-IFLs are available in all the standard IFL sizes. Custom sizes are also available upon request.