HA-FCGR at a hydrogen gas pressure of 5.5 MPa, loading frequency of 1 Hz, and stress ratio of 0.5 for pipeline steels with yield strengths ranging from 325 MPa to 800 MPa. As shown in Ref. 106, Slifka et al., measured the HA-FCGR of ferritic steels with yield strengths ranging from 325 to 800 MPa, at a hydrogen gas pressure of 5.5 MPa, loading frequency of 1 Hz, and a stress ratio of 0.5, and found no correlation between the yield strength and HA-FCGR. Reprinted from Slifka et al., J. Pressure Vessel Technol. 140, 011407 (2018).106