The rate of austenitizing depends on the primary microstructure, the grain size of the prior austenite,
the chemical composition of the steel and the temperature of austenitizing [18]. Based on the results for
the austenitizing temperature and the austenitizing time, 800oC and 60min have been extracted to achieve
fine grains [19]. Since mechanical properties depend on the microstructure, examination of the effect of
microstructure on the strength and ductility is the main concern of researchers [1]. Room temperature
tensile properties, Charpy impact energy, reduction of area, elongation and hardness of the steels after
various heat treatment are given in Table4.