Effect of annealing process parameters and properties of base material on magnetic properties of ultra-thin grain-oriented silicon steel strip

The cold-rolled ultra-thin gain-oriented silicon steel strips with different annealing parameters were studied by EBSD technology. The relationship between microstructure, texture and magnetic properties of annealed samples was analyzed, and the effect of properties of the base material on the performance of the ultra-thin strip was discussed. The results show that the annealing microstructure uniformity, high Goss orientation and better magnetic properties of the base material can effectively improve magnetic properties of the ultra-thin strip, and the annealing heating rate mainly affects the grain size, Goss orientation and magnetic properties; the change of the average grain size of recrystallization structure influences the magnetic induction and iron loss of the final ultra-thin band. Recrystallization obviously occurs after annealing at 900 degrees C for 5 min, magnetic properties of ultra-thin strips change little after annealing for 10-30 min while the best magnetic properties can be obtained after annealing for 15 min. In addition, the annealing time should not exceed 10 min at 1000 degrees C and 1100 degrees C, otherwise the magnetic properties will deteriorate.