Abstract: The evolutions of microstructure and texture of medium temperature Cu-bearing grain oriented silicon steel under hot rolling, first cold rolling, decarburizing annealing and second cold rolling were studied by EBSD technology. The results showed that the microstructure and texture of the hot rolled plate were uneven in the thickness direction, the surface layer was recrystallized grains, the center layer was mainly deformed grains, and the Goss grains were mainly distributed in the subsurface. The Goss grain was an unstable rolling texture, which will disappeared after the first and second cold rolling and reappeared after annealing, which reflected the genetic characteristics of Goss. After cold rolling, the texture gradually concentrated on α-line texture, and the higher the compression rate, the sharper the texture was. After annealing, the texture gradually migrated to γ texture.

Key words: grain oriented silicon steel, microstructure and texture, rolling, annealing