RU2000107732A - METHOD FOR PRODUCING STEEL - Google Patents

Claims (1)

Method for the production of steel, including steelmaking in an electric arc furnace, discharge into a ladle and after-furnace treatment, characterized in that the steel is smelted in two electric furnaces, the dephosphorization and decarburization of the cast iron being cast into the furnace being carried out with oxygen blowing at a flow rate of 1000-5000 m ³ / h of lime and iron-doped with oxidants flow respectively 10-35 and 1-20 kg / t steel, whereupon the crude product of the first unit is produced in a ladle filled with steel incompletely precursor disintegrations burned in the second electric furnace unit from scrap metal, moreover, when steel is released, furnace slag is cut off, and a solid slag-forming mixture consisting of fluorspar, lime and alumina is planted in the bucket in the ratio (1.0-2.0) :( 4-6.5 ) :( 0-1) and with a flow rate of 15-20 kg / t, after discharge, the bucket with metal is fed to the after-treatment plants, where the chemical composition in the ladle is brought to the required ferroalloys and alloys specified by the additive and steel desulfurization is blown with an inert gas with a flow 45-80 ^Nm3 / h in an amount of 0.1 - 0.5 nm ³ / t steel alternation tuyere under the porous lime-aluminous slag having a basicity of 1.5-3.0 and powdered lime injection at a rate of 0,01-0,50 kg / t steel.