Development of 15CrODS ferritic steels for over 1273 K service

The 15 wt% CrODS steels (15CrODS steels) were manufactured as the high-temperature fusion reactor materials and their tensile properties at 1273 K were correlated with the oxide dispersion strengthening before and after aging. Fine dispersion of the oxide particles at initial condition in 15CrODS steels gives significantly higher strength compared with commercial MA956. The strength decrease in 15CrODS steels after aging at 1473 K for 100 h is attributed to coarsening of oxide particles, thus weakening of dispersion strength.