METHOD OF PRODUCING REGULAR GRAIN-ORIENTED SILICON STEEL WITH HIGH MAGNETIC INDUCTION Russian patent published in 2017 - IPC C21D8/12 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, specifically to production of grain-oriented silicon steel. Method includes melting and continuous casting of steel to produce a slab, wherein content of N at melting step is controlled at level of 0.002–0.014 wt%. Method includes hot rolling and cold rolling to obtain a sheet of final thickness. Method includes decarbonisation, annealing and treatment by nitriding, wherein content of embedded nitrogen [N]_D satisfies expression: 328–0.14a–0.85b–2.33c ≤ [N]_D ≤ 362–0.16a–0.94b–2.57c, where a is content of Als at melting step, in ppm; b is content of N at melting step, in ppm; c is size of primary grains, in mcm. Coating of magnesium oxide is applied on surface of sheet, annealed and insulating coating is applied.

EFFECT: steel has high values of magnetic induction B8 of not less than 1,88 T.

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