Abstract: In order to improve the stability of magnetic properties of grain-oriented silicon steel, the effects of basic alloying elements C, Si, Mn, S, Al and N on the γ phase transition temperature, the γ phase maximum content and its corresponding temperature were analyzed by Thermo-Calc software system. And the effects to the precipitation temperature, maximum precipitation amount of AlN and MnS phases were also analyzed. The results showed that with the increase of C content, the transition temperature, the maximum content and the temperature corresponding to the maximum content of γ phase are all increased. With the increase of Si content, the transition temperature, the maximum content and the corresponding temperature of maximum content of γ phase are all decreased. The maximum precipitation amount of MnS phase is mainly affected by the content of S. The maximum precipitation of AlN phase is increased greatly with the increase of N content.

Key words: grain-oriented silicon steel, Thermo-Calc, alloying elements, precipitated phase