High strength ferritic alloy
AssigneeThe United States of America as represented by the United States Energy Research and Development Administration
InventorsWilliam C. Hagel, Frederick A. Smidt, Michael K. Korenko
Life of this patent
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Abstract
A high-strength ferritic alloy useful for fast reactor duct and cladding applications where an iron base contains from about 9% to about 13% by weight chromium, from about 4% to about 8% by weight molybdenum, from about 0.2% to about 0.8% by weight niobium, from about 0.1% to about 0.3% by weight vanadium, from about 0.2% to about 0.8% by weight silicon, from about 0.2% to about 0.8% by weight manganese, a maximum of about 0.05% by weight nitrogen, a maximum of about 0.02% by weight sulfur, a maximum of about 0.02% by weight phosphorous, and from about 0.04% to about 0.12% by weight carbon.
Claims3
A high strength ferritic alloy having Laves phase precipitation as the primary ferritic alloy strengthener consisting essentially of from about 9% to about 13% by weight chromium, from about 4% to about 8% by weight molybdenum, from about 0.2% to about 0.8% by weight niobium, from about 0.1% to about 0.3% by weight vanadium, from about 0.2% to about 0.8% by weight silicon, from about 0.2% to about 0.8% by weight manganese, from 0.04% to about 0.12% by weight carbon, a maximum of about 0.05% by weight nitrogen, a maximum of about 0.02% by weight sulfur, a maximum of about 0.02% by weight phosphorus, and the balance iron, wherein said alloy will swell less than 5% at the fluence of 2.2 .times. 10.sup.23 n/cm.sup.2 (E >
- 0.1 MeV) and wherein said alloy exhibits 100 hour stress rupture strength in the range of about 30 ksi at 650.degree. C.
Dependencies are inferred from the claim text.