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Hot rolled high strength low alloy (HSLA) steels are widely used in the automobile steels, which require high strength to ensure the safety norms and reduce the weight of car bodies for fuel efficiency. Additionally, good ductility is very crucial for the complicated forming process.1–3) However, the ductility often reduces with the increasing strength. Therefore, it is difficult to obtain the combination of high strength and excellent ductility.4,5) Nanohiten, the (Ti,Mo)C precipitation hardened high strength hot rolled steel sheet developed by JFE corporation,6,7) implemented the balance between strength and ductility, with high cost of molybdenum addition. Unlike the addition of titanium and molybdenum, both niobium and titanium added to HSLA steels can obtain grain refinement and precipitation strengthening.8) Recently, a number of researchers have studied Nb–Ti microalloyed steels. The influence of deformation temperature on recrystallization and precipitation behavior in austenite was investigated by Kostryzhev et al.9,10) The study on the effects of deformation temperature and cooling rate on the continuous cooling transformation elucidated the relationship between transformation driving force, deformation temperature and Microstructural Characteristics with Various Finish Rolling Temperature and Low Temperature Toughness in Hot Rolled Nb–Ti Ferritic Steel