Ductile Fracture Behavior of ASTM A516 Gr.70 Pressure Vessel Steel by ASTM and ISO Fracture Toughness Standards

Fracture toughness determination is crucial for the design phase of pressure vessels, and, although ASTM E1820 and ISO 12135 fracture standards have existed some time, differences been reported in this property. This study investigates ductile behavior A516 Gr.70 vessel steel assesses estimating both standards. The steel’s tensile properties initiation (JIC) were evaluated, taking into account parallel perpendicular orientations to rolling direction. results reveal properties’ dependence on direction, mainly attributed perlite banding. Additionally, as JIC determination, associated with different blunting line slope estimations each standard, reinforcing necessity a work-hardening-based material assessed.