METHOD OF PRODUCTION OF HIGH-ALLOY STEELS IN 20-100 TON ARC FURNACES

摘要

The invention relates to ferrous metallurgy and can be used in the smelting of high-alloyed steel in electric arc furnaces using out-of-furnace melt processing in two ladles. The goal is to increase the degree and stability of the assimilation of alloying elements and the degree of desulfurization. reduction of heat losses. In arc furnaces with a capacity of 20-100 tons, the smelting is carried out with a single-slag process. The amount of reduction of alloying elements from slag during overflow is determined. In the transfer bucket at 1600 - 1700 ° C, 0.40-0.85% silicon and 0.005 - 0.015% aluminum by weight of metal and alloying elements are introduced in a quantity determined by the lower limit of the grade composition, taking into account the reconstructed sludge, the metal is weighed and determine its chemical composition. When processing with a refining slag, aluminum is introduced in the casting ladle in the amount of 0.020 - 0.055% by weight of the metal. At the same time, the metal consumption during the discharge from the furnace and overflow from the ladle to the ladle is carried out in the range of 0.10-0.30 t / s. When pouring from the ladle into the ladle, the first 5 to 30% of the mass of metal is poured at a rate of 0.7 - 1.0 from the maximum, then 20 - 50% of the metal at a rate of 0.2 - 0.4 from the maximum, and the remaining metal is consumed 0.7 - 1.0 of the maximum. 30 to 180 seconds after the metal has been drained, slag overflow is performed at a rate of 0.08-0.16 of the maximum metal consumption. 1 hp f-ly, 2 tab. ate with o ate cj ate about