METHOD FOR PRODUCING ELECTRICAL STEEL SHEET Russian patent published in 2024 - IPC C21D8/12 H01F1/16 H01F1/147 C22C38/60 C22C38/06 C22C38/04 C22C38/02 C22C38/58 C22C38/42 C22C38/40 C22C38/34 C22C38/38 C22C38/20 C22C38/18 C22C38/16 C22C38/08 

FIELD: metallurgy.

SUBSTANCE: production of electrical steel sheets used as a material for manufacture of iron cores of various electrical equipment. The method includes casting a slab, hot rolling, cold rolling and bringing the electrical steel sheet into contact with a solution. The electrical steel sheet contains, in wt.%: C: greater than 0 and 0.10 or less, Si: 2.5 or more and 4.5 or less, Mn: 0.01 or more and 5.0 or less, one or more of S, Se and Te: more than 0 and 0.050 or less in total, acid-soluble Al: more than 0 and 5.0 or less, N: more than 0 and 0.015 or less, and P: greater than 0 and 1.0 or less, optionally one or more elements selected from the group containing Cu: 1.0% or less, Sb: 1.0% or less, Mo: 1.0% or less, Cr: 1.0% or less, Sb: 1.0 or less and Ni: 1.0 or less, Fe and impurities are the balance. Said solution contains one or more elements of Cu, Hg, Ag, Pb, Cd, Co, Zn, and Ni in a total concentration of 0.00001 wt.% or more and 1.0000 wt.% or less. In the process of bringing the electrical steel sheet into contact with the solution, the pH value of the solution is -1.5 or more and 7 or less, the solution temperature is 10°C or more and 100°C or less, and the time for which the electrical steel sheet is in contact with the solution is 3 seconds or more and 200 seconds or less.

EFFECT: production of electrical steel sheet with excellent magnetic characteristics and coating film adhesion.

4 cl, 5 tbl, 5 ex