Double-pass compression experiment with different interval time was designed to simulate the deformation process of 5% Ni cryogenic steel 07Ni5DR under the hot-rolling procedure. The static softening rate was calculated based on the stress-strain curves of the tested steel. In addition

the kinetic process of static recrystallization was analyzed to offer experimental and theoretical guidance for reasonably planning the rolling technology. Results indicate that the softening rate of the tested steel increased with the increase of deformation temperature and interval time. The activation energy of static recrystallization for the 5%Ni cryogenic steel was calculated to 233.97 kj/mol. Furthermore

the kinetic equation of the static recrystallization for the 5%Ni cryogenic steel was established.