Process for making a martensitic steel alloy fuel cladding produ

Metal treatment – Compositions – Heat treating

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148135, C21D 900

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049274686

ABSTRACT:
This is a very narrowly defined martensitic steel alloy fuel cladding material for liquid metal cooled reactors, and a process for making such a martensitic steel alloy material. The alloy contains about 10.6 wt. % chromium, about 1.5 wt. % molybdenum, about 0.85 wt. % manganese, about 0.2 wt. % niobium, about 0.37 wt. % silicon, about 0.2 wt. % carbon, about 0.2 wt. % vanadium, 0.05 maximum wt. % nickel, about 0.015 wt. % nitrogen, about 0.015 wt. % sulfur, about 0.05 wt. % copper, about 0.007 wt. % boron, about 0.007 wt. % phosphorous, and with the remainder being essentially iron. The process utilizes preparing such an alloy and homogenizing said alloy at about 1000.degree. C. for 16 hours; annealing said homogenized alloy at 1150.degree. C. for 15 minutes; and tempering said annealed alloy at 700.degree. C. for 2 hours. The material exhibits good high temperature strength (especially long stress rupture life) at elevated temperature (500.degree.-760.degree. C.).

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Bennett and Horton; "Material Requirements for Liquid Metal Fast Breeder Reactor"; Metallurgical Trans. A; vol. 9A, Feb. 1978, pp. 143-149.
Fujita et al; "Effect of Mo and W on Long Term Creep Rupture Strength of 12% Cr Heat-Resisting Steel Containing V, Nb and B"; Trans. ISIL, vol. 18, 1978, pp. 115-124.

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