Abstract
In order to investigate stress corrosion cracking (SCC) of X65 pipeline steel and its welded joint area in deep sea environment. The simulated methods were used to obtain the welded joint of hardening and softening tissue in heat affected zone (HAZ) by annealing at 1300°C for 10min and then, normalized in air and quenched in water respectively; the other was to get 1000m depths of marine environment. The effect of hydrogen on SCC behavior of X65 pipeline steel in simulated deep sea environment was analyzed by a combination of hydrogen-charging, slow stain rate test (SSRT), scanning electron microscope (SEM) and electrochemistry. Results demonstrated that with the increasing of charging current density, Fracture of as-received appeared brittle characteristics and normalized and quenched steel generated micro cracks, Hydrogen-charging will enhance the SCC susceptibility of the steel in simulated deep sea environment. The corrosion potential of X65 steels was low in deep sea environment with hydrogen evolution reaction and showed some SCC sensitivity in deep sea environment. Heat treatment altered the microstructure of the steel, resulting in a change of SCC susceptibility. In particular, the quenched steel with a bainite micro-structure which had a higher SCC susceptibility than as-received and normalized steel in deep sea environment.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
