In this study, the austenite grain growth behaviour of a 1CrMoV bainitic alloy steel, used in turbine rotor applications [1,2], was explored through a series of heat treatment experiments. The soaking experiments were conducted in a muffle furnace at temperatures ranging from 950 to 1050°C, with soaking times varying from 0 to 19 hours, to quantitatively assess the kinetics of grain growth in austenite. Expectedly, the results indicated that the grain growth was influenced by both the reheating temperature as well as soaking time, with temperature being the dominant factor. The occurrence of grain growth in austenite with respect to time followed a power law, and a contour map was generated to understand the relationship between the grain size, temperature, and corresponding hold time. The kinetics of austenite grain growth were analysed based on detailed microstructural observation using laser scanning confocal microscopy. A semi-empirical mathematical model was developed, which showed good agreement with the experimental data including validation tests. Additionally, a cellular automata model was utilized to simulate the nucleation and growth of austenite during reheating and soaking process. This paper presents an account of the recent results obtained on grain growth studies of the1CrMoV bainitic alloy steel.