Evaluation of grain boundary embrittlement of phosphorus added F82H steel by SSTT

► We evaluated the mechanical properties using the phosphorus added F82H steels. ► The DBTT and reference temperature (T0) after P addition is also shifted to higher temperatures. ► The intergranular fracture is induced by grain boundary segregation of phosphorus. ► The embrittlement accompanied by IG fracture can simulate the non-hardening embrittlement.