Abstract
The paper deals with precipitate chemical composition of Fe-3%Si steel after hot rolling, cold rolling, decarburization annealing, and in the final state. Secondary microphases were obtained by electrochemical and chemical methods of isolation. Using EDX, X-ray diffraction, and chemical analyses, it was found that the precipitate fraction, from hot to final state, is decreasing, but the content of the particle-formating elements Al, Mn, and Ti is increasing. In the final state of Fe-3%Si steel there is more of AlN precipitates than of Al₂O₃ ones and the number of the MnS particles is doubled.

Key words
Fe-3%Si steels, electrotechnical steels, EDX, X-ray diffraction, chemical analyses

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