SHEET OF NON-TEXTURED ELECTRICAL STEEL Russian patent published in 2022 - IPC C21D8/12 C22C38/02 C22C38/60 H01F1/147 H01F1/16 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to a sheet of non-textured electrical steel with a thickness of 0.01-0.35 mm, used as a material for the manufacture of engine cores for hybrid cars. A sheet of non-textured electrical steel contains an inner layer and surface layers located on both sides of the inner layer. Each of the surface layers has a chemical composition containing, wt. %: C: 0.0090 or less, Si: 2.5-7.0, Mn: 0.50 or less, at least one element selected from a group consisting of P: 0.010-0.100, Sn: 0.001-0.10 and Sb: 0.001-0.10, the rest is Fe and unavoidable impurities. The inner layer has a chemical composition containing, wt. %: C: 0.0090 or less, Si: 1.5-5.0, Mn: 0.01-0.50, at least one element selected from a group consisting of P: 0.010-0.100, Sn: 0.001-0.10 and Sb: 0.001-0.10, the rest is Fe and unavoidable impurities. The ratio of the total thickness of the surface layers t₁ to t, represented by t₁/t, is 0.10-0.70. The difference between [Si]₁ and [Si]₀, represented as ΔSi, is 1.0-4.5 wt. %, where [Si]₁ denotes the Si content in each of the surface layers and [Si]₀ denotes the Si content in the inner layer. The difference between [Mn]₀ and [Mn]₁, represented as ΔMn, is 0.01-0.40 wt. %, where [Mn]₀ denotes the Mn content in the position in the middle of the thickness t/2 and [Mn]₁ denotes the average Mn content in the area from the surface of the sheet of non-textured electrical steel to positions at a depth of (1/10)t.

EFFECT: sheet has a high magnetic flux density and low losses in iron.

3 cl, 6 dwg, 3 tbl