SHEET OF ELECTRICAL STEEL WITH ORIENTED GRAIN STRUCTURE Russian patent published in 2022 - IPC C22C38/02 C22C38/60 C21D8/12 H01F1/16 H01F1/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to a sheet of electrical steel with an oriented grain structure, used as the material of the iron core of transformers. The sheet has a chemical composition, % wt.: from 2.0 to 7.0 Si, from 0 to 0.030 Nb, from 0 to 0.030 V, from 0 to 0.030 Mo, from 0 to 0.030 Ta, from 0 to 0.030 W, more than 0 and up to 0.0050 C, from 0 to 1.0 Mn, from 0 to 0.0150 S, from 0 to 0.0150 Se, from 0 to 0.0650 Al, from 0 to 0.0050 N, from 0 to 0.40 Cu, from 0 to 0.010 Bi, from 0 to 0.080 B, from 0 to 0.50 P, from 0 to 0.0150 Ti, from 0 to 0.10 Sn, from 0 to 0.10 Sb, from 0 to 0.30 Cr, from 0 to 1.0 Ni, the rest iron and impurities. The sheet includes a texture aligned in the Goss orientation. In the sheet of electrical steel, when (α₁ β₁ γ₁) and (α₂ β₂ γ₂) constitute the angles of deviation of the crystal orientations, measured at two measurement points adjacent on the surface of the sheet, wherein the distance between said points is 1 mm, the boundary condition BA is defined as |β₂-β₁|≥0.5°, and the boundary condition BB is defined as [(α₂-α₁)²+(β₂-β₁)²+(γ₂-γ₁)²]^1/2≥2.0°, and the boundary separating the inner part of the secondary recrystallised grains satisfies the boundary condition BA and does not satisfy the boundary condition BB.

EFFECT: sheet has improved magnetostriction.

14 cl, 4 dwg, 39 tbl, 4 ex