Stabilization of carbon in austenitic alloy tubing

Details Stabilization of carbon in austenitic alloy tubing Stabilization of carbon in austenitic alloy tubing

C - Chemistry, Metallurgy

22

F

148/31

C22F 1/10 (2006.01)

Patent

CA 1174947

Abstract of the Disclosure A heat treating process for homogenizing high nickel alloy material so that the carbon is stabilized in the form of carbides having chromium-sufficient "envelopes". A heavily cold- worked intermediate sized tube is annealed by a continuous conveyor furnace for about 20 minutes at a temperature of about 1350°F. The stabilized product is than cold worked to final size and annealed at a temperature about 1485°F. without the occurrence of sensitization and the associated susceptibility to corrosion attack. The final product has extremely fine grain size and the carbides are distrib- uted throughout the grains. The method is also suitable for use on other austenitic alloys.

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