Research on the correlation between impact toughness and corrosion performance of Cr13 Super martensitic stainless steel under deferent tempering condition

•DL-EPR was used to describe the precipitation of carbides in super Cr13 stainless steel.•The main reason for the decrease in impact toughness is the precipitation of continuous Cr-rich carbides (M23C6) along the interface.•Solution treatment before quenching and tempering treatment can improve the impact toughness.•The impact tough of the steel can be predicted by DL-EPR.