 This study examined the effects of burnishing on the surface layer of 317T steel valve stems. Burnishing improved the surface roughness, hardness, and residual stress, resulting in significantly longer durability of the graphite seals. Based on these findings, it is recommended that sliding diamond burnishing be used as a finishing treatment for valve stems. This article was authored by Michyslav Korzynskiy, Kazimira Dudek, and Katerzhena Korzynska.