ANISOTROPIC ELECTRICAL STEEL SHEET Russian patent published in 2023 - IPC C21D8/12 C22C38/00 C22C38/02 C22C38/60 H01F1/147 

FIELD: metallurgy.

SUBSTANCE: sheet of anisotropic electrical steel, including in its chemical composition, in wt.%: 2.0-7.0 Si, 0-0.030 Nb, 0-0.030 V, 0-0.030 Mo, 0-0.030 Ta, 0-0.030 W, 0.0050 or less C, 0-1.0 Mn, 0- 0.0150 S, 0-0.0150 Se, 0-0.0650 Al, 0-0.0050 N, 0-0.40 Cu, 0-0.010 Bi, 0-0.080 B, 0-0.50 P, 0-0.0150 Ti, 0-0.10 Sn, 0-0.10 Sb, 0-0.30 Cr, 0-1.0 Ni, and the balance consisting of Fe and impurities. The sheet contains a texture aligned with the Goss orientation, and when α is defined as the angle of deviation from the ideal Goss orientation based on the axis of rotation parallel to the Z normal direction when β is defined as the angle of deviation from the ideal Goss orientation based on an axis of rotation parallel to the transverse direction C, when γ is defined as the angle of deviation from the ideal Goss orientation based on the axis of rotation parallel to the rolling direction L when (α₁β₁γ₁) and (α₂β₂γ₂) are the deviation angles of the crystallographic orientations measured at the two measurement points that are adjacent on the sheet surface and that have an interval of 1 mm, when the boundary condition BAα is defined as |α₂-α₁|≥0.5° and grain size RAα_L is defined as the average grain size obtained from the boundary condition BAα in the rolling direction L, when the boundary condition BAβ defined as |β₂-β₁|≥0.5° and grain size RAβ_L is defined as the average grain size obtained from the boundary condition BAβ in the rolling direction L, when the boundary condition BAγ defined as |γ₂-γ₁|≥0.5° and grain size RAγ_L is defined as the average grain size obtained from the boundary condition BAγ in the rolling direction L, and when the boundary condition BB is defined as [(α₂-α₁)²+(β₂-β₁)²+(γ₂-γ₁)²]^1/2≥2.0°, there is a boundary that satisfies the boundary condition BAβ and which does not satisfy the boundary condition BB, there is a boundary that satisfies the boundary condition BAγ and which does not satisfy the boundary condition BB. Grain size RAα_L and grain size RAβ_L satisfy the condition RAβ_L<RAα_L. Grain size RAα_L and grain size RAγ_L satisfy the condition RAγ_L <RAα_L.

EFFECT: decrease in the level of magnetostriction velocity and reduction of transformer noise.

5 cl, 3 dwg, 32 tbl, 3 ex