Abstract: Static recrystallization behavior of austenite for micro-alloyed steel during hot rolling was studied and the influence (т-εdiagram) of holding time and deformation at different deformations and isothermal temperatures on microstructural state of austenite were discussed. Corresponding to parameter Z in the dynamic recrystallization diagram, parameter Y was then introduced to simplify static recrystallization diagrams.

Key words: Micro-alloyed steel, Hot deformation of austenite, Static recrystallization