Carburization resistant alloy

Details Carburization resistant alloy Carburization resistant alloy

1986-11-24

1988-08-09

Dean, R.

Alloys or metallic compositions

Nickel base

Chromium containing

148410, 148428, 420445, C22C 1905

Patent

active

047626810

ABSTRACT:
A carburization-resistant alloy comprising in weight percent about 50 to about 55% nickel, about 16 to 22% chromium, about 3 to about 4.5% aluminum, up to about 5% cobalt, up to about 5% molybdenum, up to about 2% tungsten, about 0.03 to about 0.3% carbon, up to about 0.2% rare earth element, balance essentially iron. The alloy is useful for structures, objects, parts etc. which are exposed in use to carburizing atmospheres and which, periodically are subjected to oxidizing atmospheres. For example the alloys are useful for pyrolysis tubes used in the petrochemical industry which must periodically be subjected to oxidizing atmospheres to burn-out carbon deposits and which, during pyrolysis are in contact with atmospheres having log Po.sub.2 spanning at least the range of -17 to -26 and which exist at various temperatures.

REFERENCES:
patent: 4388125 (1983-06-01), Benn

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