High energy rate forming (HERF) was used to study the thermo-mechanical behavior of 22-13-5 stainless steel. Tensile yield strengths in excess of 150 k.s.i. (1033 MPa) were achieved with 15% elongations. Tests comparing 21-6-9 stainless with 22-13-5 showed the strengthening response of the latter to be better. Tests to evaluate the hydrogen compatibility of 22-13-5 in the annealed and HERFed condition showed a lack of sensitivity to both external and internal hydrogen environments.