TEXTURED ELECTRIC SHEET METALS WITH EXTREMELY HIGH MAGNETIC PROPERTIES AND METHOD OF ITS MANUFACTURING Russian patent published in 2009 - IPC C21D8/12 C21D9/46 C22C38/60 H01F1/16 

FIELD: metallurgy.

SUBSTANCE: it is implemented reheating of slab, containing wt %: C from 0.025 up to 0.10, Si from 2.5 up to 4.0, Mn from 0.04 up to 0.15, solAl from 0.020 up to 0.035, N from 0.002 up to 0.007, S and Se in the form of Seq equivalent S: Seq = S+0.406×Se from 0.010 up to 0.035, Ti ≤0.007 and the rest is Fe and unavoidable admixtures, up to 1280°C-of temperature of solid solution formation of inhibitory substances or higher, hot rolling, annealing and cold rolling, decarburising annealing, azotising of moving strip, coating made of annealing divider and final annealing, herewith emission rate of N, contained in steel strip after hot rolling in the form of AlN, is equal 20% or lower, middle size of initially recrystallised grains after finishing of decarburising annealing is from 7 micrometre up to less than 20 micrometer, increasing of nitrogen ΔN, wt % at azotising is in the range, corresponding equation: 0.007-([N]-14/48x[Ti] ≤ ΔN ≤ [solAl]x14/27-([N]-14/48x[Ti])+0.0025, where: sol Al- acid-soluble aluminium, and content of nitrogen σN1 and σN2 for each surface for 20% depth from surface of steel strip is in the range, corresponding equation: [σ N1-σN2] ≤ 0.35, where: σ N1, σN2 - azotising volume of correspondingly facial and back surface of strip, wt %.

EFFECT: receiving of sheet steel with extremely high magnetic properties.

12 cl, 4 ex,7 tbl, 2 dwg