UNDIRECTED SHEET OF ELECTRICAL STEEL AND METHOD FOR ITS PRODUCTION Russian patent published in 2021 - IPC C22C38/12 C21D8/12 H01F1/16 H01F1/147 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to an undirected sheet of electrical steel used as a material for the steel core of car engines with electric drive, rotors, small and medium-sized transformers. Electrical steel sheet has a chemical composition containing, by wt. %: C: 0.0050 or less, Si: 2.0 or more and 6.0 or less, Mn: 1.0 or more and 3.0 or less, P: 0.20 or less, S: 0.0050 or less, N: 0.0050 or less, Al: 0.0050 or less, one or more elements selected from a group consisting of B: 0.0001 or more and 0.0050 or less, Nb: 0.0001 or more and 0.0050 or less and V: 0.0005 or more and 0.0500 or less, and, if necessary, at least one element selected from the group: Sn: 0.01 or more and 0.50 or less, Sb: 0.01 or more and 0.50 or less, Ca: 0.0001 or more and 0.0300 or less, Mg: 0.0001 or more and 0.0300 or less, rare earth element: 0.0001 or more and 0.0300 or less, Ni: 0.01 or more and 5.00 or less and Co: 0.01 or more and 5.00 or less, the rest is Fe and random impurities. The particle density of Si-Mn nitrides having an average diameter of 50 nm or more and 500 nm or less is 1/mcm³ or less.

EFFECT: manufactured sheets have low losses in iron.

3 cl, 4 dwg, 3 tbl, 2 ex