Abstract: The effect of different heating rates on the microstructure and texture of high grade non-oriented silicon steel during normalizing was investigated by means of electron back-sacttered diffraction. The results show that the average grain size of the samples after normalizing increases when the heating rate increases from 16 ℃/s to 50 ℃/s. However, the average grain size of samples begins to decrease when the heating rate reaches 100 ℃/s. The average grain size of samples with {100}、{210}、{111} orientation increase remarkablely when the heating rate is 50 ℃/s, and γ orientation line texture of the samples after normalizing are weakened, λ orientation line texture of the samples after normalizing are strengthened, η orientation line texture of the samples after normalizing are strongest when the heating rate is 50 ℃/s. The texture factor TF of the sample after normalizing is biggest corresponding to the most favorable texture when the heating rate is 50 ℃/s. 

Key words: high grade non-oriented silicon steel, heating rate, microstructure, texture