SHEET FROM NON-ORIENTED ELECTRICAL STEEL AND METHOD FOR ITS MANUFACTURE Russian patent published in 2023 - IPC C21D8/12 C22C38/16 C22C38/60 H01F1/147 

FIELD: metallurgy.

SUBSTANCE: invention relates to non-oriented electrical steel sheet with controlled chemical composition and steel sheet microstructure, having suitable iron loss characteristics at high frequencies and high fatigue strength. Sheet of non-oriented electrical steel, having a chemical composition, % by weight: C 0.0100 or less, P 0.100 or less, Si 2.00 or more and 5.00 or less, Mn 5.00 or less, Al 3.00 or less, S 0.0100 or less, N 0.0050 or less, Zn 0.0005 or more and 0.0030 or less, Mo 0.001 or more and 0.100 or less, Cu 0.2 or less, Nb 0.010 or less, O 0.0050 or less, if necessary, at least one of: Cr 0.010 or more and 5.000 or less, Ca 0.0010 or more and 0.0050 or less, Sn 0.001 or more and 0.100 or less, Sb 0.0010 or more and 0.1000 or less, and the rest is Fe and unavoidable impurities. The sheet has a microstructure in which the proportion of non-recrystallized microstructure is 5% or more and 70% or less, and the number of inclusions with a diameter of 5 mcm or more is not more than 5 per mm².

EFFECT: sheet is suitable for use in an internal permanent magnet motor rotor, which has suitable magnetic flux density B₅₀ and high frequency iron loss characteristics, high tensile strength and fatigue strength.

2 cl, 2 dwg, 66 ex, 4 tbl