In order to assess the integrity of welded pressure vessel containing a crack, behavior three-point bending specimens made HSLA steel joint are tested at -40°C, and their fracture behaviour analyzed, as conservative measure crack resistance. Specimens were low-alloyed NIONIKRAL 70, by SAW process. Surface notches machined electro-erosion method in parent metal (PM), heat affected zone (HAZ) wel...

An X70 natural gas pipeline steel that is being considered for blended gas/hydrogen service was evaluated in a high-pressure hydrogen environment. Fracture toughness testing and fatigue crack growth rate were conducted according to ASTM standards the results are presented context of ASME B31.12 qualification. While reduction fracture observed, behavior within acceptable bounds service.