Effect of coating and heat treatment on high temperature burst property of stainless steel thin-walled tube

In order to investigate the high temperature burst behavior and effect of coating and heat treatment on burst properties of stainless steel thin-walled tube for pressurized water reactor (PWR) and supercritical water-cooled reactor (SCWR) under the simulated LOCA (loss of coolant accident) conditions, the transient-heating burst tests of original, heat treatment and coated tube specimens were carried out under the simulated LOCA conditions by using the high temperature burst facility. The data of high temperature burst properties based on three kinds of 316L stainless steel tubes and the relationships between burst strength and total circumference elongation (TCE) with temperature were obtained under the conditions of 600-1200℃ and heating rate of 5℃/s, meanwhile, the fracture morphology and microstructure of burst test specimens were analyzed. The results of the burst test show that heat treatment temperature of coating preparation is the main reason for the decrease in burst strength, and the coating has little effect on the high temperature burst strength. (authors)