Abstract: Different normalization annealing experiments were carried out on 27AHSW450 highstrength nonoriented silicon steel. The results showed that equiaxed crystals with almost complete recovery and recrystallization were observed at above 950℃ after normalized at 900~1030 ℃ for 50 minutes. The distribution of texture transferred from hotrolled sheet texture to randomly oriented texture. After final annealing at 950 ℃ for 6 minutes, the texture distribution in the final annealing sheet tended to be consistent, mainly consisting of λ fibre texture, α* fibre texture and strong γ fibre texture. The magnetic induction of rolling direction was better than that of transverse direction. The highest magnetic induction value was 1.64 T when normalized at 900 ℃. The core loss differed a little in rolling direction and transverse direction. The lowest iron loss value was 25.1 W/kg when normalized at 950 ℃.

Key words: high strength nonoriented silicon steel, normalization annealing, texture distribution, magnetic induction, core loss