Applying the finite difference method for numerical solution of one dimensional heat transfer equation provides a simple way for cooling process simulation of hypoeutectoid low alloy steel rod (round long length bar). The obtained results are comparable with ones calculated using finite element modeling commercial software. The temperature difference of the proposed model and literature experimental data for 50…270 mm diameter bars cooled in still air and conventional oil does not exceed 25°C for the whole examined time-temperature regions before the phase transformation.