ELECTRICAL STEEL SHEET WITH ORIENTED GRAIN STRUCTURE, STEEL SHEET USED FOR FINISH ANNEALING, ANNEALING SEPARATOR, METHOD FOR MANUFACTURING ELECTRIC STEEL SHEET WITH ORIENTED GRAIN STRUCTURE AND METHOD FOR MANUFACTURING ELECTRIC STEEL SHEET FOR FINISHED ANNEALING STEEL PLATE Russian patent published in 2023 - IPC C21D1/70 C21D8/12 C23C22/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to an annealing separator used in the process of finishing annealing in the production of a of electrical sheet steel with a grain-oriented structure. The annealing separator contains MgO as the main component, one or more elements selected from the group including Y, La and Ce, and one or more elements selected from the group including Ca, Sr and Ba. The proportions (%) of the contents of Mg, Y, La, Ce, Ca, Sr and Ba contained in the annealing separator, in relation to the content of MgO, satisfy the relationships: (1): (0.00562[Y]+0.00360[La]+0,00714[Ce])/0.0412[Mg]⋅100(%): from 0.20 to 1.60(%) and (2): (0.0249[Ca]+0.0114[Sr]+0.0073[Ba])/0.0412[Mg]⋅100(%): from 0.20 to 1.80(%). The proportions (%) of the contents of Mg, Ca, Sr and Ba contained in the MgO raw material powder, in relation to the MgO content in the MgO raw material powder contained in the annealing separator, satisfy the relationship: (3): (0.0249[Ca']+0.0114[Sr']+0.0073[Ba'])/0.0412[Mg']⋅100(%): from 0.010 to 0.080(%). Therein the ratio (3) in relation to the ratio (2) is 0.200-0.020. The average particle size R1 of MgO is from 0.1 to 2.8 mcm, and the average particle size R2 of particles containing one or more elements selected from the group consisting of Ca, Sr and Ba in the annealing separator is from 0.2 to 3.0 mcm. The average particle size R1 and R2 satisfies the condition: (average particle size R2)/(average particle size R1) is from 0.5 to 3.0.

EFFECT: use of a calcined separator makes it possible to obtain a grain-oriented electrical steel sheet in which the fixing oxide layer and the surface oxide layer become suitable in shape, and it becomes possible to achieve both the shear and bending adhesion of the primary coating and the required steel loss characteristics.

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