RANDOM-ORIENTATION ELECTROTECHNICAL STEEL SHEET, IMPROVED FROM SIDE OF LOSSES IN MANDREL Russian patent published in 2009 - IPC C22C38/14 H01F1/16 H01F1/147 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy field, particularly to creation of random-orientation electrotechnical steel sheet, improved by losses in mandrel. Sheet is implemented from steel, containing elements at following ratio, wt %: carbon ≤ 0.01, silicon 0.1 - 7.0, aluminium 0.1 - 3.0, manganese 0.1 - 2.0, nitrogen ≤ 0.005, titanium ≤ 0.02, rare earth elements ≤ 0.05, sulphur ≤ 0.005, oxygen ≤ 0.005, iron and constant admixtures are the rest. Content of sulphur, oxygen, rare earth elements, titanium and nitrogen fulfill correlations: [rare earth elements]²×[O]²×[S]≥1×10^-15 and ([rare earth elements]²×[O]²×[S])/([Ti]×[N])≥1×10^-10, where [rare earth elements] - content of rare earth elements in wt %, [O] - content of oxygen in wt %, [S] - sulphur content in wt %, [Ti] - titanium content in wt %, [N] - nitrogen content in wt %. Steel contains oxy-sulphides of rare earth elements of size from 1 micrometre up to 5 micrometre, allowing cracks or fractures, from which not lea than 5% are oxy-sulphides of rare earth elements, combined with titanium nitride.

EFFECT: there are improved magnetic properties ensured by depression sedimentation of fine-dispersed titanium carbide at sections of sheet with lower temperature during annealing process.

4 cl, 4 dwg, 2 tbl, 1 ex