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Grain growth in microalloyed steels has been studied extensively in the last two decades with some equations developed to predict the growth behaviour in these steels.1–3) The addition of microalloying elements (Nb, Ti, or V) results in precipitation of finely dispersed precipitates, which may retard austenite grain growth through grain boundary pinning.4,5) The associated evolution of particle size and volume fraction produces a change in the pinning force that controls the austenite grain growth through Zener pinning and the microstructural changes.5–7) In steels, austenite grain size is a microstructural parameter that must be carefully controlled during heat treatment.4,6–8) With conventional approaches (e.g. Metallography), the on-line in situ monitoring of austenite grain growth at high temperatures is not feasible. Alternative on-line technique is the laser ultrasonic, which is costly due to the special equipment, required.9) Predicting the austenite grain growth behaviour based on processing conditions is the ideal option. Several attempts have been made to empirically develop equations to predict the austenite grain growth behaviour in steels bearing microalloying elements (MAE).1–4,10–12) The setting of n to a constant value makes it easier to plot lnDn as a function of the inverse temperature (1/T) in order to obtain Q.1–3,13,14) The constant n is dependent on the alloy composition as well as the processing conditions.1–4) It has Austenite Grain Growth Kinetics after Isothermal Deformation in Microalloyed Steels with Varying Nb Concentrations