As part of project EMAT-4-Stress 2, the research team developed a method to determine stress-related stress gradients of pipeline components non-destructively, taking into account the microstructure of metastable austenitic Cr-Ni steels with rapid load consequences. To do this, they investigated the relationship between the mechanical tension and the ultrasonic signal on samples with purely austenitic and defined austenitic-martensitic states using elastic and elastic-plastic deformation tests..