|About this Abstract
|2020 TMS Annual Meeting & Exhibition
|Advanced High Strength Steels IV
|Improvement of Hydrogen Induced Cracking Resistance by Tempering of an X65 Pipeline Steel for Sour Service
|Mary O'Brien, Kip O. Findley
|On-Site Speaker (Planned)
Hydrogen induced cracking (HIC) occurs in steel pipelines during sour service due to elevated levels of hydrogen sulfide. In this investigation, an X65 steel was accelerated cooled to produce a granular bainitic microstructure and then charged with hydrogen by exposing steel samples to a high ppm hydrogen sulfide gas environment without an externally applied stress. Several of the as-received samples were also tempered for 40 minutes at 300, 400, 500, and 600°C. All tempering treatments improved HIC resistance, but the 400°C sample was the least effective in doing so. Mechanical properties such as hardness and UTS do not trend with HIC resistance, contrary to beliefs informing industrial selections of steels for sour service. The results are discussed in the context of microstructural features present at the various tempering temperatures.
|Planned: Supplemental Proceedings volume