Metal treatment – Compositions – Heat treating
Patent
1978-01-06
1979-10-30
Steiner, Arthur J.
Metal treatment
Compositions
Heat treating
75124, 75128F, 75128T, 75128W, C22C 3806, C22C 3850
Patent
active
041727428
ABSTRACT:
An essentially gamma-prime precipitation-hardened iron-chromium-nickel alloy has been designed with emphasis on minimum nickel and chromium contents to reduce the swelling tendencies of these alloys when used in liquid metal fast breeder reactors. The precipitation-hardening components have been designed for phase stability and such residual elements as silicon and boron, also have been selected to minimize swelling. Using the properties of these alloys in one design would result in an increased breeding ratio over 20% cold worked stainless steel, a reference material, of 1.239 to 1.310 and a reduced doubling time from 15.8 to 11.4 years.
The gross stoichiometry of the alloying composition comprises from about 0.04% to about 0.06% carbon, from about 0.05% to about 1.0% silicon, up to about 0.1% zirconium, up to about 0.5% vanadium, from about 24% to about 31% nickel, from 8% to about 11% chromium, from about 1.7% to about 3.5% titanium, from about 1.0% to about 1.8% aluminum, from about 0.9% to about 3.7% molybdenum, from about 0.04% to about 0.8% boron, and the balance iron with incidental impurities.
REFERENCES:
patent: 3065067 (1962-11-01), Aggen
patent: 3300347 (1967-01-01), Kasza et al.
patent: 3420660 (1969-01-01), Kawahata et al.
patent: 3895939 (1975-07-01), Brooks et al.
patent: 4066447 (1978-01-01), Smith, Jr. et al.
Bajaj Ram
Bleiberg Melvin L.
Diamond Sidney
Rowcliffe Arthur F.
Randig R. T.
Steiner Arthur J.
The United States of America as represented by the United States
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