Abstract
The paper deals with the sulphide-nitride inhibition variant of Fe-3%Si (AlN, MnS particles) combined by Cu co-precipitation with MnS. These secondary microphases - precipitates - were obtained by electrochemical and chemical isolation methods. Using the chemical and EDX analysis method to the samples of orientated electrochemical steel of different types, the changes of AlN and MnS precipitates in the state after hot rolling, decarburization, and in the final state was found. Cu addition to MnS influences the particle formation with various chemical composition of ε-Cu in combination with Cu₂S, or with Cu_2-xMn_xS complex. If Cu < 0.1 % is present in orientated electrotechnical steel, the both ε-Cu particles and Si₃N₄ precipitates are precipitated and if Cu > 0.1 %, the spherical ε-Cu particles and ellipsoidal Cu₂S particles or co-precipitates of Cu and MnS are precipitated to the detriment of Si₃N₄.

Key words
sulphide-nitride inhibition, chemical and electrochemical isolation, AlN, MnS precipitates, Cu co-precipitation with MnS, ellipsoidal Cu₂S particles, Cu_2-xMn_xS complex, spherical ε-Cu particles

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