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Synopsis: 21/4Cr-I Mo steel are generally used for the huge reactor vessels that operate at high pressure and elevated temperature, because of its good short and long time elevated tensile properties and its good resistance to hydrogen attack. Requirements for higher operating volume and pressure have accelerated a demand for reactor vessels of extra heavy gauge wall thickness and upgraded mechanical properties throughout the thickness. To obtain informations needed for effetive uses of 2'/4Cr-1 Mo steels, a fundamental and systematic study was carried out on the heavy gauge steels of 100-400 mm in thickness. In this study, the effect of cooling rates from austenitizing temperature on microstructures, the effect of cooling rates and tempering cycles on mechanical properties and elevated temperature tensile properties were investigated. The results obtained are as follows:

Study on 2<SUP>1/4</SUP>-Cr 1Mo Steel for Elevated Temperature Service