Abstract: The effect of hot rolling temperature on hot rolling microstructure of 50W800 non oriented silicon steel was analyzed by means of software analysis and simulation test rolling. The results showed that the end temperature of ferrite austenite transformation was 1 115 ℃, the end temperature of austenite ferrite transformation was 996 ℃, and there was two⁃phase rolling in the finishing rolling process; when the heating temperature is above 1 100 ℃, the precipitation of sulfide and nitride increases greatly with the increase of temperature. Decreasing the heating temperature can reduce the precipitation of sulfide and nitride in non oriented silicon steel, and can reduce the blocking effect of solid solution on grain growth; Increasing the finishing rolling temperature can increase the grain size of hot rolled steel plate, form coarse and uniform ferrite structure, and increase the {001}<110> texture ratio, which is conducive to the improvement of magnetic properties of non oriented silicon steel.

Key words: non oriented silicon steel, heating temperature, finishing rolling temperature, solid solution, texture