| Recently, computer modeling of microstructural changes and the relationships between microstructure and mechanical properties of hot rolled steel products has been under active development in the research community. However, most of these studies have concentrated on C-Mn steel rather than Microalloyed Steel, especially High Strength Low Alloy steel. In this paper, through combining actual production with experimental research, we not only gave the qualitative analysis between microstructural evolution and processing variables, but also offered a new mathematical models based on physical metallurgy of austenite structure after deformation quantitatively. Furthermore, according to the mathematical models constructed, process optimization has been considered.Matching with production process, 4 group experiments, which are composed of reheat tests, single pass compression tests, interrupted compression tests, and multipass compression tests, have been performed on THERMECMASTOR-Z in WuGang technology center. The aim of reheat tests is to determine the austenite grain sizes prior to deformation. The end of single compression tests is to clarify the softening mechanisms of dynamic recrystallization (DRX), which takes place in the loaded condition. The objective of interrupted compression tests is to analyze the softening mechanisms of static recrystallization (SRX), which occurs hi the unloaded condition. The goal of the multipass compression tests is to identify the softening mechanisms taking place in nonrecrystallization region and its influence on austenite state. Excellent agreement between experimental result and prediction result has been achieved. In addition, through adjusting processing parameters, grain refinement can be obtained furtherly.
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