METHOD OF PRODUCING CARBON AND LOW ALLOY STEELS IN 100-TON ARC FURNACES

摘要

The invention relates to ferrous metallurgy, in particular to the production of steles of electric arc furnaces. The goal is to increase the productivity of the furnace and reduce power consumption. In melting carbon and low alloyed steels, 70-90% of the oxidative sludge is melted in the stoton arc furnaces, 0.2-0.4 tons of carburizer are introduced, 5-10 minutes after the furnace is turned on, 1-2 tons of lime are introduced at a rate of 0.10-0. 15 t / min, together with the second portion of the charge, 2-4 tons of lime and a carburizer are introduced in an amount determined by the formula m - 0.15 ^ - (C - BM 10'V "SIO * ^ where TP is the mass of carbide ; C is the required carbon content in the feed after melting: M is the mass of the charge with a carbon content of more than 0.4%. T; Together the mass of the charge, t; 0.15 and 5 - to EFFICIENCY. Capacity is increased by 1 ton / h, power consumption is reduced by 15 kWh / ton. Table 1 ^ ^ ^ The invention relates to ferrous metallurgy, in part 1 Spi to steel production in electric arc furnaces. The purpose of the invention is to increase productivity nieim and reduction of energy consumption. The proposed method can be used in the smelting of carbon and low-alloyed steel grades according to State Standards 1050-74,380-71, 4543-71, 11.19281-73. The slag in the furnace is left in the following ways: fast (5-10 C) return in the furnace 8 the moment of the beginning of the slag to the original Position: slag thickening in the kiln before discharging lime, lime or magnesite additives: slag cut-off in the process of discharging the capillary melt 5 by blowing metal and slag with argon (nitrogen) through a special device located near the steel outlet orifice. Slag in the kiln before starting The content of ferrous oxide in it is 10–20%. The metal is not left in the furnace after the metal has been discharged. A carburizer introduced into the remaining slag in the furnace acts as a diluent (this is a new property). In addition, the introduction of the carburizer to the oxidizing slag enhances such a well-known property as foaming, which is associated with a high concentration of carbon dioxide.