SU706452A1 - Method of steel refining - Google Patents

Description

(54) FOSS STEEL REFINING

The invention relates to the field of ferrous metallurgy, namely, to the production of steel in electric arc furnaces. The invention can most effectively be used to refine steel when discharging a heat from a furnace into a ladle, for example, medium and; low carbon constructional steel grades. Known methods of smelting, steel, in an electric arc furnace, providing. metal processing in the ladle with own refining putty. To do this, the asha is first poured into the ladle and then the metapp is released; The efficiency of refining of steel by slag processing in a ladle is largely dependent qT of the slag deacidification depth 1. Known is also the method of processing steel and alloys (Ensuring slag separation in the ladle before metal is added. However, the introduction of deoxidized body into the slag melt in the ladle leads to a decrease in the temperature of the slag and, as a result, a decrease in its refining ability 2. Of the known methods of refining, they have become the closest to the image; the technical essence is the method of steel deoxidation, which consists in It is assumed that the slag is placed on the slag pre-carbonized in one step 2-10 minutes before the melt is released from the furnace; silicon-containing deoxidizers at the rate of 0.25-0.50% silicon. The weight of the metalS3 The disadvantage of the known method of steel deoxidation is that Silicon-containing deoxidizing additives on slag (all in one step) can only be used in smelting high carbon grades of alloyed steel, since the sufficiently high deoxidizing ability of carbon ensures a low carbon content. constituent elements without deoxidation of the metal and slag during the reducing period stronger than carbon, plural deoxidizer. Doping of the carbon-metal metal is associated with the need to pre-scale the metal foam and maintain a rather low slag oxidation during the entire reduction period with very limited use as a deoxidizing agent.