Abstract: Cold-rolled plate of Cu-bearing grain oriented silicon steel was subjected to decarburization annealing at 840 ℃ for different time (1-13 min). The effect of annealing time on the content of C and O elements, primary recrystallized grains, oxide layer and texture of the grain oriented silicon steel was investigated. The results show that with the increase of decarburization annealing time, the content of O increases gradually, while the content of C decreases first and then remains unchanged. Due to the uneven stress in the thickness direction during the one-stage cold rolling process, the recrystallized grain size of the steel plate is uneven. As the decarburization annealing time increases, the inhomogeneity becomes more obvious. With the increase of decarburization annealing time, the thickness of oxide layer increases, the proportion of rotating cube texture {001}<110> and cube texture {001}<100> decreases gradually, the content of {111}<112> texture increases first and then decreases, and the proportion of Goss texture {110}<001> is basically unchanged.

Key words: Cu-bearing grain oriented silicon steel, decarburization annealing time, microstructure, texture