HSLA steels with improved hydrogen sulfide cracking resistance

Effect of the chemical composition of welds of pipelines on their resistance to crack propagation in hydrogen-sulfide environments

“…This is evidently due to the cast structure of welds and to the fact that other nonmetallic inclusions are mainly globular in shape. But, in the metal of pipes (as a result of deformation caused by rolling), they are elongated with sharp tips that causes the nucleation and growth of internal hydrogen-induced cracks and favors the propagation of corrosion-mechanical cracks under hydrogen-sulfide stress cracking [19,20]. Thus, the adverse effect of sulfur and phosphorus in welds is less noticeable than in the rolled metal.…”

“…In combination with thermomechanical treatment during rolling of the metal, it allows one to obtain a high strength at a relatively low concentration (< 0.05-0,08%) of each alloying component [17][18][19][20][21][22][23]. However, their effect on the serviceability of welds in hydrogen-sulfide environments has practically not been studied.…”

“…For pipe steels, the effect of alloying elements on the resistance to hydrogen-sulfide stress cracking was studied rather extensively [17][18][19][20]. However, the role of the chemical composition of the metal of welds, which differs from rolled metal of tubes by its cast macrostructure, the existence of separate zones formed for each welding run, etc., have not been adequately investigated.…”

“…It is well known that, as the carbon content in pipe steels decreases, their resistance to hydrogen-sulfide stress cracking grows [17][18][19][20]. The use of thermomechanical treatments (controlled rolled stock, etc.)…”

Effects of cooling processes on microstructure and susceptibility of hydrogen‐induced cracking of X80 pipeline steel

“…Yokota et al studied the impacts of precipitates containing vanadium, and they found that the role of V(C, N) as hydrogen traps was very obvious and were irreversible traps. Moreover, as early as 1985, Pressouyre et al noted that it was easy to deform long‐shaped MnS inclusions when there was a relatively high sulfur content in pipeline steel. The diffusible hydrogen atoms would gather readily in the two ends of the MnS inclusion with very little radius of curvature that it further initiated cracks .…”