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In order to study the effect of stress and strain on electrochemical characteristics and stress corrosion behavior of hydraulic control pipeline of safety valve in thermal recovery well, high temperature and high pressure autoclave was used to simulate the thermal recovery environment of 260 °C and 1 % oxygen partial pressure, and the stress corrosion of 316L hydraulic control pipeline was characterized by SEM and EDS. The results showed that the stress and strain made the passive film of 316L hydraulic control pipeline produce microcracks, which reducing the corrosion resistance of pipeline. In the simulated environment of high temperature and high pressure thermal recovery, oxygen promoted the microcrack to become the small anode, the passive film was the large cathode, and the crack tip autocatalytic developed, which eventually led to stress corrosion cracking of 316L hydraulic control pipeline and multiple parallel circumferential cracks. [ABSTRACT FROM AUTHOR]

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