To obtain a complete dissolution of the nitrides of titanium (TiN) is necessary to reach temperatures close to the melting temperature or even higher temperatures corresponding to the liquid state. For this reason, TiN are good controllers of the austenitic grain size. This characteristic is used in structural steels to control the microestructural evolution in the hot rolling and in heat processes like in the welding in the zone affected thermically (ZAT). However, the quantitative influence of TiN particles on the hot deformation strength and on the static recrystallisation, this latter responsible for the microestructural evolution, is practically unknown. In the present work, the influence of different Ti and N compositions on the hot deformation strength have been studied determining the peak stress of the flow curves and the activation energy. The influence on the static recrystallization have been determined by means of the static recrystallisation fraction versus time and with the activation energy. A precipitate study by means of SEM and TEM was done in order to better understand the influence of the Ti/N ratio of the steels.