Process for making a martensitic steel alloy fuel cladding product

Patent · Tue May 22 04:00:00 EDT 1990

OSTI ID:6632691

Johnson, G D; Lobsinger, R J; Hamilton, M L; Gelles, D S

This patent describes 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. % phosphorus, and with the remainder being essentially iron. The process utilizes preparing such an alloy and homogenizing the alloy at about 1000{degrees} C for 16 hours; annealing the homogenized alloy at 1150{degrees} C for 15 minutes; and tempering the annealed alloy at 700{degrees} C for 2 hours. The material exhibits good high temperature strength (especially long stress rupture life) at elevated temperature (500{degrees}--760{degrees} C).

• Assignee: Dept. of Energy, Washington, DC (USA)
• Patent Number(s): A; US 4927468
• Application Number: PPN: US 7-278068A
• OSTI ID: 6632691
• Country of Publication: United States
• Language: English

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CHEMICAL COMPOSITION
CHROMIUM-MOLYBDENUM STEELS
CLADDING
DEPOSITION
ENERGY SOURCES
FABRICATION
FUELS
LIQUID METAL COOLED REACTORS
MATERIALS
NUCLEAR FUELS
PHYSICAL PROPERTIES
REACTOR MATERIALS
REACTORS
SURFACE COATING
THERMODYNAMIC PROPERTIES