In this research, annealing processes were carried out on low carbon steel to produce different grain sizes. The specimens were examined by using metalography and grain size measurement followed by mechanical testing. The relation between annealing temperature and grain size, annealing temperature and hardness, and grain diameter and mechanical properties were made. The equation suggested by Hall-Petch was evaluated for the metal of interest. A qualitative and quantitative analysis of influence of grain size on the mechanical properties is conducted. The results show that increasing of the annealing temperature lead to the growth of grains, which are followed by decreasing of the hardness and other mechanical properties. The Hall-Petch equation ca be applied successfully to the investigated steel. Agus Suhartono BPPT
