Theoretical approaches of hot plastic deformations by rolling with the aim of structure formation are discussed. The influence of reheating conditions as are reheating temperature and holding time on reheating temperature on diameter of grain size is presented. From observation is resulting the strong effect on grain growth of course grain structures during steel reheating has temperature, while holding time on reheating temperature has a minor effect. The hot plastic deformations at spontaneous static recrystallization of austenite and retard region of static recrystallization of austenite and their influence on diameter grain size are discussed. The effective way for increasing of strength and plastic properties is grain refinement of final structure which can be achieved by plastic deformations at spontaneous recrystallization region of austenite, plastic deformations at nonrecrystallized region of austenite, plastic deformation at dual phase region (γ+α) with followed by phase transformation to ferrite. The conditions of phase transformations and their influence to structure development and mechanical properties are presented. The controlling of austenite grain size and ferrite grain size by process parameters as are temperature, deformation, cooling rate is very important tool from point of view making of final mechanical properties directly by metal forming processes. The observed materials are steels.Keywords: diameter of grain size, mechanical properties, plastic deformation
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