Sulfidation resistant nickel-iron base alloy

Details Sulfidation resistant nickel-iron base alloy Sulfidation resistant nickel-iron base alloy

1980-07-28

1983-04-05

Dean, R.

Alloys or metallic compositions

Nickel base

Chromium containing

148162, C22C 1905

Patent

active

043791204

ABSTRACT:
A sulfidation-resistant alloy containing about 0.02-0.08 w/o carbon, 21-24.5 w/o chromium, 52-60 w/o nickel, 1-3.5 w/o molybdenum, 1.75-3.25 w/o titanium, 0.75-2.25 w/o aluminum, 0.50-2 w/o columbium, up to 0.02 w/o boron and the balance iron, the elements being balanced to provide an average electron-vacancy number Nv not greater than 2.54. When so balanced, the alloy is stabilized against the formation of no more than 10 v/o Cr-rich alpha phase. Preferably, the elements are balanced so that Nv is not greater than 2.45 and better yet not greater than 2.40.

REFERENCES:
patent: 3972713 (1976-08-01), Muzyka et al.
Woodyatt, Sims & Beattie, Jr.; "Prediction of Sigma-Type Phase Occurrence from Compositions in Austenitic Superalloys", Transactions of the Metallurgical Society of AIME, vol. 236; Apr. 1966; pp. 519-527.
Sims, "A Contemporary View of Nickel-Base Superalloys", Journal of Metals, Oct. 1966, pp. 1119-1130.

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