Demonstration of Improved Radiation Embrittlement Resistance of A533-B Steel Through Control of Selected Residual Elements

摘要

The primary objective of special melt specifications and melt planning was the reduction of copper and phosphorus contents to the lowest possible level. Restrictions were also imposed on the content of other residual impurity elements with known or suspected influences on radiation embrittlement resistance. For a broad experimental analysis, the melt was split to provide material representing the primary melt analysis (0.03% Cu) and a melt modification (0.13% Cu). Plates representing each analysis were also split and sections individually heat-treated to Class 1 or Class 2 strength conditions. All procedures used were standard mill practices. Radiation assessments showed the primary melt analysis to have very low sensitivity to radiation embrittlement at 550F (288C). (Author)