An irregular influence of rolling-finishing
temperature on the grain structure of steel Q235 hot rolling plates was investigated
by structure observation,grain size determination and texture analysis.It was observed that the grain size in the surface layer of steel Q235
hot rolling plate is commonly smaller than that of in the center layer,which is mainly induced by higher nucleation rate in the surface layer at lower phase transformation
temperature as well as by possible dynamic recrystallization.Stronger {001}<110> and {554}<225> ferrite textures were obtained if the finishing temperature fell at 860℃～880℃ close to A_3 point.The textures indicate that many un-recrystallized austenite grains with certain stored energy survived in the hot rolling plate after roll-finishing at that temperature.The structure promotes the transformation from austenite to ferrite just below A_3 point,resulting in irregular a little bit larger average grain size than that of hot rolling plates finishing at higher temperature.