Effect of cryogenic treatment on the tensile behaviour of En 52 and 21-4N valve steels at room and elevated temperatures

► Tensile behaviour of cryo-treated valve steels are investigated at elevated temperature. ► En 52 and 21-4N valve steel materials are treated at - 196 oC . ► Tensile strength of cryo-treated En 52 and 21-4N valve steel has improved by 8 % and 12 % respectively. ► Precipitation of fine carbides through cryogenic treatment is the reason for the improved strength.