With very good neutron irradiation resistance performance,ferritic/martensitic steels is one of the candidate materials for hexagonal outer wrapper of fast reactor.Many countries have developed a long-term research program.In order to study the performance for ferrite/martensitic hexagonal outer wrapper of fast With very good neutron irradiation resistance performance, ferritic / martensitic steels is one of the candidate materials for hexagonal outer wrapper of fast reactor. Many countries have developed a long-term research program. Order to study the performance for ferrite / martensitic hexagonal outer wrapper of fast