COATING SOLUTION FOR FORMATION OF INSULATING FILM FOR ELECTRICAL STEEL SHEET WITH ORIENTED GRANULAR STRUCTURE AND METHOD OF PRODUCING ELECTRICAL STEEL SHEET WITH ORIENTED GRANULAR STRUCTURE Russian patent published in 2021 - IPC C23C22/00 C23C22/08 C23C22/74 

FIELD: steel production.

SUBSTANCE: group of inventions relates to a coating solution for forming an insulating film for an electrical steel sheet with a grain-oriented structure and a method for producing said electrical steel sheet. The proposed solution contains one or more types of hydrosilicate powders having an average particle size of 2 microns or less, and one or more types of phosphoric acids and phosphates satisfying the ratio ∑n_iM_i/∑P_i≤0,5, and satisfies Formula 1: 1,5≤(∑n_iM_i+∑n’_jM’_j)/∑P_i≤15, where P is the number of moles of phosphorus, M is the number of moles of metal ions derived from phosphate, n is the valence of metal ions derived from phosphate, i is is the number of phosphate types, M’ is the number of moles of metal elements in the hydrosilicate, n’ is the valence of the metal elements in the hydrosilicate, and j is the number of hydrosilicate types.

EFFECT: provides an insulating film having a large film tension, a large iron loss reduction effect without using a chromium compound, and excellent fill factor, corrosion resistance and water resistance.

6 cl, 2 dwg, 3 tbl, 15 ex