METHOD OF TEXTURIZED ELECTRIC STEEL SHEET PRODUCTION Russian patent published in 2017 - IPC C21D8/12 H01F1/16 C22C38/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy. Textured sheet from electrical steel, having good magnetic properties, is produced by industrially suitable method using slab material, which contains, in wt% or ppm. at wt, C: 0.08% or less, Si: from 2.0 to 4.5 % and Mn: 0.5 % or less, S: less than 50 ppm., Se: less than 50 ppm., O: less than 50 ppm.,sol. Al: less than 100 ppm., N within range, corresponding to [sol. Al]×(14/27) ppm. ≤ N ≤ 80 ppm., rest is Fe and incidental impurities; in which after cold rolling and before beginning of secondary recrystallization annealing cold-rolled sheet is subjected to nitride treatment to obtain nitrogen content from 50 ppm. by weight or above, up to 1,000 ppm. by weight or less; and total sulphate of and/or sulphide content in annealing separator is from 0.2 wt% to 15 wt%; holding time in temperature range from 300 °C to 800 °C during heat treatment at secondary recrystallization annealing is from 5 hours or more in order to release silicon nitride (Si₃N₄) and MnS; and using silicon nitride in combination with MnS as normal grains growth inhibitor in order to considerable reduction in magnetic properties change.

EFFECT: change of magnetic properties.

3 cl, 1 dwg, 3 tbl