Method for refining 1Cr10Co6MoVNbN stainless steel forging grains

The invention relates to a method for refining 1Cr10Co6MoVNbN stainless steel forging grains. The method comprises: carrying out refinement, quenching and tempering on a forging, and reasonably controlling temperatures and thermal insulation times in various step to obtain the grain-refined stainless steel part. According to the present invention, one time heat treatment process for grain refining is added before the final part heat treatments of quenching and tempering are performed, such that the grains can be uniformly refined; when the temperature reaches the phase change temperature, the phase change occurs, such that the phase change stress is generated inside the system due to the phase change volume effect, the formed single-phase austenite generates slightly deformation, and the austenite is subjected to recrystallization so as to achieve the grain refinement effect, improve the qualification rate, and reduce a large amount of scrap loss.