ISOTROPIC ELECTRICAL STEEL SHEET Russian patent published in 2023 - IPC C21D8/12 C22C38/02 C22C38/60 H01F1/147 H01F1/16 

FIELD: metallurgy.

SUBSTANCE: invention is related to sheets of anisotropic electrical steel used as a material for iron cores of transformers. The sheets have the following chemical composition, %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, not more than 0.0050 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, the rest is Fe and impurities. The sheet contains the texture aligned with the Goss orientation. The texture of the sheet has a low-angle boundary that separates the interior of the secondarily recrystallized grain and satisfies the boundary condition BAγ and which does not satisfy the boundary condition BB, the grain size RAα_C and grain size RAγ_C satisfy the condition RAγ_C <RAα_C, and grain size RAβ_C and grain size RAγ_C satisfy the condition RAγ_C <RAβ_C, where the boundary condition BAα defined as |α_2-α₁|≥ 0.5° and grain size RAα_C is defined as the average grain size obtained from the boundary condition BAα in transverse direction C, boundary condition BAβ defined as |β_2-β₁ |≥ 0.5° and grain size RAβ_C is defined as the average grain size obtained from the boundary condition BAβ in transverse direction C, boundary condition BAγ defined as |γ_2-γ₁ | ≥ 0.5° and grain size RAγ_C is defined as the average grain size obtained from the boundary condition BAγ in the transverse direction C, the boundary condition BB is defined as [(α₂ - α₁)² + (β₂ - β₁)² + (γ₂ - γ₁)²]^1/2 ≥ 2.0°α defined as the angle of deviation from ideal Goss orientation based on an axis of rotation parallel to the Z normal direction, β is defined as the angle of deviation from ideal Goss orientation based on an axis of rotation parallel to the transverse direction C, 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, (α₁ β₁ γ₁) and (α₂ β₂ γ₂) are the deviation angles of the crystallographic orientations measured at two measurement points that are adjacent on the sheet surface and that are spaced 1 mm apart.

EFFECT: sheet has an improved level of magnetostriction rate and excellent magnetic loss characteristics.

4 cl, 3 dwg, 33 tbl, 3 ex