高速炉構造用316FR鋼のクリープ破断関係式の提案

抄録

316FR stainless steel is a candidate of structural materials for Sodium-cooled Fast Reactor (SFR) in Japan. The material strength standard of 316FR stainless steel up to 300,000 hours has been published by JSME in 2012. The design life of SFR is 60 years. Therefore, the material strength standard up to 500,000 hours is required. This paper discusses the long-term creep properties of 316FR stainless steel. The relationship between creep rupture time and creep rupture elongation, minimum creep rate are changed in long-term region. The creep rupture equation was formulated base on the changing of creep properties. Compared with the present JSME creep rupture equation, more precise prediction of creep life especially in long-term region was provided by the proposed creep rupture equation.