Application of ladle bottom low-nickel-chromium residual iron in plain carbon steel smelting process

Abstract

The invention discloses an application of ladle bottom low-nickel-chromium residual iron in a plain carbon steel smelting process. The application of the ladle bottom low-nickel-chromium residual ironin the plain carbon steel smelting process specifically comprises the following steps that low-nickel ferrochrome water ladle containing low-nickel ferrochrome water waste liquid condensate receiveshigh-temperature plain carbon molten iron in an early smelting early-stage of a converter top-blowing steelmaking process, so that molten of low-nickel chromium residual iron in the high-temperature molten iron is reduced to obtain mixed molten iron; and then the mixed molten iron is added into the converter to be mixed with the plain carbon steel scrap for blowing; the amount of the low-nickel-chromium residual iron is less than or equal to 0.15% of the content of chromium in the mixed converter, and then in the early-stage low-temperature condition of the smelting, the chromium in the molteniron is preferentially reacted with dissolved oxygen, the content of the chromium is increased, so that the generation amount of FeO is reduced, namely the FeO concentration of the steel slag interface is reduced, the oxidation reaction can be carried out uniformly and stably, and the splashing phenomenon is reduced; and due to the fact that oxidability of the molten iron is further weakened, theuse amount of a deoxidizing agent in the subsequent smelting process can be reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of stainless steel smelting, in particular to the application of bottom-clad low-nickel-chromium residual iron in the process of ordinary carbon steel smelting. Background technique [0002] When smelting ordinary carbon steel Q195 by converter top blowing, due to the peroxidation of molten steel, the oxygen content in the steel is high, and the solubility of oxygen in the steel decreases with the decrease of temperature. , resulting in molten steel splashing easily during the smelting process, which poses a great safety hazard. The splashing also leads to increased consumption of steel materials, which increases production costs, and the splashed steel slag enters the bottom of the furnace and easily wraps the track under the furnace. , resulting in a shutdown accident. Since the peroxidation of molten steel is the main cause of splashing, how to avoid peroxidation of molten steel is the fundamental measure to preve...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that reducing the oxygen supply intensity will weaken the carbon-oxygen reaction. At the same time, the operation of the pressure gun is not conducive to slag removal compared with the high gun position, and there are defects such as slag drying back causing accidents such as gun sticking.

[0005] In view of the unsatisfactory effect of reducing the oxygen supply intensity or increasing the oxygen supply intensity and supplementing the method of lowering the blowing gun position in the existing technology to reduce the FeO content, it is worthwhile to change the thinking to obtain a more efficient anti-splash solution research topic

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