About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Effects of Cryogenic Treatment on Mechanical Properties and Microstructure of X80 Pipeline Steel |
| Author(s) |
Rundong Zhang, Zhiqiang Zhao, Songyuan Ai, Yifan Li, Dengfu Chen, Mujun Long |
| On-Site Speaker (Planned) |
Rundong Zhang |
| Abstract Scope |
Synergistically improving the strength and plasticity of X80 pipeline steel is crucial for ensuring the safe transportation of oil and gas. This study proposed a novel approach based on hot rolling technology, using cryogenic treatment to regulate the microstructure and properties of pipeline steel. Its effects were quantitatively analyzed. The results indicated that after 15 h of cryogenic treatment, the X80 steel achieved a 14.4% increase in post-uniform elongation while simultaneously enhancing its tensile strength by 8.0%. Further microstructural characterization revealed that the primary mechanisms responsible for the improvement in strength and plasticity were grain refinement and an increased dislocation density within the steel. Quantitative analysis indicated no significant change in the phase composition of the pipeline steel before and after cryogenic treatment. In addition, the grain size was reduced by 13.9% after treatment. Notably, the dislocation density increased from 2.46 × 10¹⁴ m⁻² to 2.82 × 10¹⁴ m⁻². This study provides a fundamental basis for the application of cryogenic treatment in regulating the microstructure and properties of pipeline steels |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Shaping and Forming, Energy Conversion and Storage |