Metal treatment – Compositions – Heat treating
Patent
1974-07-02
1977-08-09
Lovell, C.
Metal treatment
Compositions
Heat treating
75122, 75128W, 148 12E, 148 31, 176 88, C22C 3844, C21D 702
Patent
active
040408760
ABSTRACT:
An alloy consisting essentially of from about 14% to 19% chromium, from 25 to 35% of nickel, from about 2% to 3% molybdenum, from about 0.1% to 1% of silicon, up to 0.5% of manganese, from about 0.03 to 0.05% carbon, up to about 0.01% sulfur, up to about 0.01% of phosphorus, up to 0.01% boron, up to about 0.01% oxygen, up to about 0.02% nitrogen, small amounts of incidental impurities, and the balance being iron, the alloy having an N.sub.v (average electron vacancy number) value of between 1.6 and 2.8, has an unexpected combination of properties enabling it to be formed by hot and cold working and heat treatment into components and members particularly suitable for use in nuclear reactors wherein the components are subjected to molten sodium, where the corrosion of the surface of the alloy is not in excess of the order of 1 to 2 mils per year, and the alloy exhibits low swelling when exposed to intense radiation, while exhibiting good physical properties at temperatures of up to 1325.degree. F. Worked and heat treated alloy members are usable as fuel cladding, grid supports, ducts and other sodium contacting in-core components that may be spaced in close predetermined relationship to ensure high reactor performance, particularly in breeder reactors, for the desired useful life thereof.
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patent: 2879194 (1959-03-01), Eichelberger
patent: 3065067 (1962-11-01), Aggen
patent: 3199978 (1965-08-01), Brown et al.
patent: 3582318 (1971-06-01), Szumachowski
patent: 3592632 (1971-07-01), Gibson et al.
patent: 3837846 (1974-09-01), Becker et al.
Bleiberg Melvin L.
Diamond Sidney
Rowcliffe Arthur F.
Spitznagel John A.
Lovell C.
Randig R. T.
Westinghouse Electric Corporation
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