Abstract: The high grade non oriented silicon steel samples of 3.2 % Si were firstly normalized at different temperatures, and then rolled and annealed in the same way, and at last the precipitates in the steel samples were observed in this paper. The results of the precipitate observation showed that the precipitate size in normalized plates was gradually increased and the areal density of  the precipitate gradually decreased as the normalizing temperatures increased, while  in final annealed plates the areal density of  the precipitate was firstly decreased and then increased. And meanwhile, it can be found that the amounts of the precipitaes with the size from 50 to 100 nm were maximized  when the normalizing temperature was set between 850 ℃ and 950 ℃.

Key words: non oriented silicon steel, normalizing temperature, precipitate, magnetic property