Weld metal resistant to neutron-bombardment embrittlement

Details Weld metal resistant to neutron-bombardment embrittlement Weld metal resistant to neutron-bombardment embrittlement

C - Chemistry, Metallurgy

22

C

75/120, 13/7

C22C 38/12 (2006.01) B23K 35/30 (2006.01) G21C 13/087 (2006.01)

Patent

CA 1088785

Abstract of the Disclosure A range of weld metals is disclosed that is resistant to changes in nil-ductility transition temperatures (NDTT) caused by expo- sure to neutron fluences greater than 1 x 1017 neutrons per square centimeter. Designed for use in nuclear reactor pressure vessels, the weldment that exhibits this resistance to neutron-induced ductility decreases is characterized by the condition that an index is less than 0.4. That index is the ratio of the sum of the weight percentages of nickel and silicon in the metal to the sum of the weight percentages in the metal of manganese, chromium and molybdenum. This constraint on the index, when applied to a weld metal within the composition ranges given in this specification, gives a weldment resistant to neutron- induced property changes.

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