RU94010733A - METHOD FOR PRODUCING STEEL - Google Patents

Claims (1)

The invention relates to steelmaking and can be used when loading charge materials into electric arc furnaces. A method for the production of steel is proposed, including the filling of scrap metal, slag-forming materials, metal concentrate for metallurgical processing, oxidized pellets in an arc furnace, their melting, metal deoxidation, lapping and discharge from the furnace, in which a metal concentrate of a fraction of 10 - 250 mm is poured into the furnace in the form a mechanical mixture with oxidized pellets at a ratio of 0.04 - 0.4: 0.02 - 0.15: 1.0 to the total weight of the metal charge, respectively, for scrap metal in an amount of 0.1 - 0.4 tons per 1 ton of melt. The metal concentrate for the metallurgical redistribution of the fraction of 10 - 250 mm has the following chemical composition, wt.%: Iron 71.0 - 90.1, carbon 2.0 - 4.7, manganese 0.3 - 1.2, silicon 0.4 - 3.6, calcium oxide 2.1 - 10.5, magnesium oxide 0.3 - 1.5, iron oxide 0.25 - 5.1, manganese oxide 0.01 - 0.4, silica 1.9 - 9.5, alumina 0.2 - 3.6, phosphorus 0.11 - 0.3, sulfur 0.1 - 0.4, graphite 0.4 - 5.9, phosphorus pentoxide 0.4 - 0.8. The semi-product is smelted in an electric furnace, and refinement and deoxidation are carried out in a ladle-furnace type unit. The proposed method allows to reduce the consumption of steel scrap by 27% and to reduce the mass fraction of non-ferrous metal impurities in steel to 21%.