High-strength Line Pipes With Enhanced Deformability

Strain-based designed (SBD) pipelines have to exhibit both a high strength level and an enhanced deformability, a combination which is not always obtained in the current productions, especially for ultra-high grade pipes (e.g. X80 and higher). This paper focuses on the one hand on the results of finite element analysis, which allows the identification of adequate tensile pipe properties, and on the other hand on the effect of microstructure on cold deformability and work-hardening of high-strength steel for line pipes to be subjected to displacement applied conditions.