Abstract
The fracture of the threaded joint of the level gauge in the reabsorption tower has been analyzed. Through the investigation of operational condition, macroscopic examination of the broken threaded joint, chemical composition analysis of the threaded joint material, metallographic examination of the threaded joint and specimens with cracks, mechanical property analysis, microscopic appearance analysis and energy spectrum analysis, the cracking mode can be attributed to Stress Corrosion Cracking (SCC) of austenitic stainless steel caused by the combined action of wet H 2 S and Cl − in medium. In this case, the material of the broken threaded joint was not 304 stainless steel, but a high Mn substituted Ni steel, beside, the threaded joint produced a lot of induced martensite during large deformation of cold working which greatly increase the sensitivity of SCC, so the material did not meet the requirements was the main factor in this fracture accident. • Failure analysis revealed that the threaded joint cracking was caused by SCC. • The material of the broken threaded joint does not meet the design requirement. • The wet hydrogen sulfide and chlorine ion are the media factor of SCC.
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.
