Abstract: Effects of heating temperature, holding time, heating rate and original state on austenite grain growth of X19CrMoVNbN11-1 blade steels were studied by 3 groups different heat treatment. The results show that the growth low of austenitic grain of the X19CrMoVNbN11-1 steel is significantly different, which is mainly affected by the original microstructure. The order of effects of various heat treatment parameters on grain growth is, heating temperature, heating rate, heating time. The grain size grade and uniformity of the X19CrMoVNbN11-1 steel after subsequent quenching and tempering can be effectively improved after heating at 500 ℃/h to 1050 ℃ for 3 h, and the grain size can be controlled at the level of 5-6 grade after heating at 1100 ℃ for 3 h. Under the test conditions, when the steel is heating at 1100 ℃, the appropriate heating rate (500 ℃/h) and holding time (3 h) can achieve better grain refinement effect.

Key words: heat resistant steel, blade steel, grain growth, normalizing pretreatment