HOT-ROLLED STEEL SHEET FOR PRODUCTION OF SHEET FROM ELECTROTECHNICAL STEEL AND METHOD OF ITS MANUFACTURING Russian patent published in 2019 - IPC C21D8/12 C22C38/02 H01F1/16 B21B45/08 

FIELD: metallurgy.

SUBSTANCE: in the manufacture of a sheet from electrical steel, a hot-rolled steel sheet is used, which contains on the surface of the sheet a scale layer which has brightness L*, as defined in JIS Z 8781-4: 2013, satisfying 30≤L*≤50, and chromaticity a* and b*, as defined in JIS Z 8781-4: 2013, satisfying -1≤a*≤2 and -5≤b*≤3, respectively, and with one end part in roll lengthwise direction as reference, color difference ΔE_ab*, as defined in JIS Z 8781-4: 2013 in central part and on opposite end part satisfies ΔE_ab*≤8.

EFFECT: assurance of magnetic flux density in a roll with minor changes at manufacture of sheet from electrical steel.

5 cl, 1 dwg, 4 tbl, 2 ex