ISOTROPIC ELECTRICAL STEEL SHEET AND ELECTRIC MOTOR CORE

Claims

1. An isotropic sheet of electrical steel having a chemical composition consisting of the following, wt.%: 0.006% or less C, from 1.0% to 5.0% Si, less than 2.5% soluble Al, 3.0% or less Mn, 0.30% or less P, 0.010% or less S, 0.010% or less N, 0.10% or less O, from 0 to 0.20% Sn, from 0 to 0.20% Sb, from 0 to 0.01% Ca, from 0 to 5.0% Cr, from 0 to 5.0% Ni, from 0 to 5.0% Cu, from 0 to 0.10% Ce, from 0 to 0.10% B, from 0 to 0.10% Mg, from 0 to 0.10% Ti, from 0 to 0.10% V, from 0 to 0.10% Zr, from 0 to 0.10% Nd, from 0 to 0.10% Bi, from 0 to 0.10% W, from 0 to 0.10% Mo, from 0 to 0.10% Nb, from 0 to 0.10% Y, and and the remainder consists of Fe and impurities, while: isotropic electrical steel sheet has an average crystal grain size from 30 µm to 200 µm, and isotropic electrical steel sheet has a degree of integration of {111} <011> from 2.00 to 8.00 in the position corresponding to 1 / 4 of the sheet thickness in the sheet thickness direction from the surface of the steel sheet.

2. An isotropic electrical steel sheet according to claim 1, wherein the isotropic electrical steel sheet comprises one or more elements selected from the group consisting of the following, by weight %: from 0.0010% to 0.20% Sn, from 0.0010% to 0.20% Sb, from 0.0003% to 0.01% Ca, from 0.0010% to 5.0% Cr, from 0.0010% to 5.0% Ni, from 0.0010% to 5.0% Cu, from 0.001% to 0.10% Ce, from 0.0001% to 0.10% B, from 0.0001% to 0.10% Mg, from 0.0001% to 0.10% Ti, from 0.0001% to 0.10% V, from 0.0002% to 0.10% Zr, from 0.002% to 0.10% Nd, from 0.002% to 0.10% Bi, from 0.002% to 0.10% W, from 0.002% to 0.10% Mo, from 0.0001% to 0.10% Nb, and from 0.002% to 0.10% Y.

3. An isotropic electrical steel sheet according to claim 1, wherein the isotropic electrical steel sheet has an integration degree of {110} <001> 1.00 or more at a position corresponding to 1 / 4 of the sheet thickness in the sheet thickness direction from the surface of the steel sheet.

4. An isotropic sheet of electrical steel according to claim 1, in which the value of the ratio of the degree of integration {111} <112> / degree of integration {111} <011> is equal to 1.00 or less at a position corresponding to 1 / 4 of the sheet thickness in the sheet thickness direction from the surface of the steel sheet.

5. An isotropic electrical steel sheet according to claim 1, wherein the isotropic electrical steel sheet has an integration degree of {411} <148> 2.00 or less at a position corresponding to 1 / 4 of the sheet thickness in the sheet thickness direction from the surface of the steel sheet.

6. An isotropic electrical steel sheet according to claim 1, wherein the isotropic electrical steel sheet has an integration degree of {411} <011> 2.00 or less at a position corresponding to 1 / 4 of the sheet thickness in the sheet thickness direction from the surface of the steel sheet.

7. An isotropic electrical steel sheet according to paragraph 1, wherein the sheet thickness of the isotropic electrical steel sheet is from 0.10 mm to 0.35 mm.

8. An electric motor core having a design in which a plurality of isotropic sheets of electrical steel according to any one of paragraphs 1-7 are laid in a stack on top of each other in layers.