METHOD OF STEELMAKING IN ARC FURNACE Russian patent published in 2015 - IPC C21C5/52 

FIELD: metallurgy.

SUBSTANCE: method comprises the furnace charging with scrap metal and lime, hot-metal charging, carbon oxidising by gaseous oxygen, dephosphorisation, subsequent steel discharge into a ladle pot with cutting of furnace slag and leaving 10-15% of the total weight of molten metal in the furnace. The charge is added by hot briquetted iron obtained as a result of direct reduction of oxidated ores, and/or formed after screening of hot briquetted iron by screeners the iron-bearing material with the fraction 4-25 mm, with the mass fraction of metal iron no less than 70%, ferrous oxides within 15-20% and carbon no less than 0.8% (5-40% of the total weight of scrap metal).

EFFECT: invention allows to improve steel quality due to decrease of the content of non-ferrous metals and nitrogen, to reduce time of melting due to increase of density of metal stock in the charge, to reduce amount of turndowns.

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