Development of extremely high temperature material property equations and physical property values on austenitic stainless steel

Onizawa, Takashi  ; Wakai, Takashi 

In order to evaluate the structural integrity under the severe accident condition, material characteristics which can be used in the numerical analyses, such as finite element analysis, were required. However, there were no material characteristics applicable to the structural integrity assessment at extremely high temperature. Therefore, a series of tensile and creep tests was performed for austenitic stainless steels at extremely high temperature which meets in some kinds of severe accidents of nuclear power plants, namely up to 1000C. Based on the acquired data from the tests, elastoplastic stress-strain equation, creep rupture equation and creep strain equation applicable to the structural analysis at extremely high temperature, up to 1000C were formulated.