Properties Degradation Research Of Storage Pressure Vessel Of Dangerous Chemicals After Fire

With the development of the domestic oil storage construction, to ensure safety of the facilities, the equipment and the oil storage tanks is of vital importance for the oil storage construction. However, the fire accidents due to the high risk of the oil storage area could be expected. In the event of the fire, the mechanical properties of the material of the oil storage tanks could eventually change. Weather the tanks could be returned to service or not is of great concern. Therefore in this paper the material properties of12MnNiVR steel will be studied through the thermal simulation to find out the influence of heat exposure temperature, heat exposure duration and the cooling rate on the organizational structure and mechanical properties of I2MnNiVR steel. This experiment means to provide the basic information and theoretical basis for the revision of Fitness-For-Service assessment procedures of storage pressure vessel after fire.The main results are as follows:(1)12MnNiVR steel possesses good heat resistance and its austenitic grain size of12MnNiVR Steel will not grow as the heat exposure temperature rises or the heat exposure duration extends.(2) The effect of heat exposure duration and heat exposure temperature on the material properties of12MnNiVR Steel is not great.(3)On the basis of the Fitness-For-Service assessment procedures after Fire revised in AP1579, this paper presents Fitness-For-Service assessment procedures of storage pressure vessel with fire damage.(4) On the basis of experimental research of12MnNiVR steel, the reliable range of hardness of12MnNiVR steel for Fitness-for-Service is [189,230] HV10.