STEEL MELTING METHOD IN OXYGEN CONVERTER Russian patent published in 2007 - IPC C21C5/28 

FIELD: ferrous metallurgy, namely processes for melting steel in oxygen converters.

SUBSTANCE: method comprises steps of loading to bath metallic scrap; pouring cast iron; blowing with oxygen; adding lime and slag forming material. After 85 -90% of oxygen is consumed for blowing, lime is added. Lime consumption is determined according to expression Q_cao = 0.0011 - Q_oxyg + 850,46 x N_blp - 1557,56 x N_cc - 17,97 where Q_oxyg - quantity of oxygen consumed before lime adding, m³/min; N_blp - nitrogen content in sample taken by means of apparatus for measuring parameters of melting during blowing process, %; N_cc - nitrogen content in sample taken according to converter charge,%; 0.0011, 850.46, 1557,56 and 17.97 - empiric coefficients.

EFFECT: enhanced strength of oxygen converter, possibility for providing desired content of nitrogen in metal.

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