Recent advances in the nuclear power generation field have pointed out the need for ferritic steels which will maintain properties at high operating temperatures for extended periods of time. Present designs for the Clinch River Breeder Reactor Project (CRBRP) specify the use of low carbon 2 1/4 Cr - 1 Mo steel for the Steam Generation systems. Many materials development programs have concluded the acceptability of this material; however, little industrial data are available on the mechanical properties of full size production components. This paper evaluates two heats of low carbon 2 1/4 Cr-1 Mo steel subjected to various heat treatments.

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