ANISOTROPIC ELECTRICAL STEEL SHEET, METHOD OF FORMING INSULATION COATING OF ANISOTROPIC ELECTRIC STEEL SHEET AND METHOD FOR PRODUCING ANISOTROPIC ELECTRIC STEEL SHEET Russian patent published in 2022 - IPC C21D8/12 C22C38/18 C22C38/60 H01F1/147 H01F1/18 C23C22/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely to a sheet of anisotropic electrical steel without a forsterite film, used as a material for iron cores of transformers. The anisotropic electrical steel sheet comprises a base steel sheet, an oxide layer in contact with the base steel sheet, and a tensile insulating coating in contact with the oxide layer. The main steel sheet has the following chemical composition, wt.%: from 2.5 to 4.0 Si, from 0.05 to 1.0 Mn, from 0.02 to 0.50 Cr, to 0.01 C, from 0 up to 0.005 S+Se, 0 to 0.01 sol. Al, 0 to 0.005 N, 0 to 0.03 Bi, 0 to 0.03 Te, 0 to 0.03 Pb, 0 to 0.50 Sb, 0 to 0.50 Sn, 0 up to 1.0% Cu, the rest is iron and impurities. The tension insulation coating is a mixed phosphate-silica coating with an average thickness of 1-3 mcm. When conducting glow-discharge spectroscopy in a region from the surface of the insulating coating with tension inside the main steel sheet, when the sputtering time at which the Fe emission intensity becomes 0.5 of its saturation value on the depth profile is denoted as Fe_0.5 in seconds, and when the sputtering time at which the Fe emission intensity becomes equal to 0.05 of its saturation value on the depth profile is denoted as Fe_0.05 in seconds, Fe_0.5 and Fe_0.05 satisfy the condition (Fe_0.5-Fe_0.05)/Fe_0.5≥0.35. When the sputter time at which the Fe emission intensity becomes equal to the saturation value on the depth profile is denoted as Fesat in seconds, and when the sputter time at which the Cr emission intensity becomes the maximum value on the depth profile is denoted as Cr_max in seconds, the maximum point Cr emission intensity, in which the Cr emission intensity at Cr_max becomes 0.08-0.25 of the Fe emission intensity at Cr_max, is between Fe_0.05 and Fe_sat on the depth profile. The magnetic induction B8 of the anisotropic electrical steel sheet in the rolling direction is 1.90 T or more.

EFFECT: sheet has high magnetic properties and adhesion of the insulating coating.

5 cl, 7 dwg, 10 tbl, 4 ex