<p>Relaxation creep is suggested as an effective method for predicting constant-load creep data due to its short duration, high efficiency, and abundant data. However, predicting constant-load creep data using relaxation creep still remains some issues and confusion, such as the fluctuation of predicted results and insufficient mechanistic analysis. The current research aims to confirm the critical conditions for the stable relationship between relaxation creep and constant-load creep and further discusses the reasons of this stable relationship. The results show that within the pre-strain range of 1%–2%, the data points for the relaxation creep rate against stress σ fall within a data band, showing consistent behavior, while the consistency deviates when pre-strains are either too low or too high. Therefore, relaxation creep rate can be stably related to minimum creep rate within the pre-strain range of 1%–2%. Moreover, the stability and consistency are further analyzed through an assessment of activation volume, internal stress and Kocks-Mecking-Estrin (KME) model. The similar deformation mechanism attributed to stable relationship between both creep. A consistent competition between hardening and softening leads to the stability of the storage and annihilation. Thus, a “dynamic steady state” is proposed to describe the pre-strain-independent relaxation creep, where relaxation creep can be stably correlated with constant-load creep.</p>