Tensile and impact behavior of the reduced-activation steels OPTIFER and F82H mod

Tensile and charpy impact tests were carried out on some OPTIFER steel grades and F82H mod. The steels show little difference in tensile properties, but pronounced differences in charpy impact properties. Combinations of low ductile–brittle transition temperature (DBTT) and high yield strength are favored for OPTIFER-IV. After aging at 600°C and higher, F82H mod steel embrittles due to precipitation of Laves phase (Cr, Fe)2W, whereas OPTIFER-IV is resistant to aging.