Stabilization of carbon in austenitic alloy tubing

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

1979-10-09

1982-06-22

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 127N, 148162, C22F 110

Patent

active

043360793

ABSTRACT:
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 coldworked intermediate sized tube is annealed by a continuous conveyor furnace for about 20 minutes at a temperature of about 1350.degree. F. The stabilized product is then cold worked to final size and annealed at a temperature about 1485.degree. 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 distributed throughout the grains. The method is also suitable for use on other austenitic alloys.

REFERENCES:
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patent: 3347715 (1967-10-01), Pfeil
patent: 3437477 (1969-04-01), McCune
patent: 3623920 (1971-11-01), Kondo et al.
patent: 3669759 (1972-06-01), Kondo et al.
patent: 3723193 (1973-03-01), Reimann et al.
patent: 3740274 (1973-06-01), Chow
patent: 4168994 (1979-09-01), Owens

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