Abstract
The aim of this study is to establish the functional relationships between different groups of factors of production and the stability of the lining of small-volume converters. At the stage of development of world metallurgy, the oxygen-converter process is the most popular way of producing structural steel. Its main difference is high productivity, which is determined by the duration of maintenance-free periods of smelting units. Under the current conditions, it is possible to increase productivity and reduce the cost of steel production in converters by increasing the stability of refractory linings. Thus it is relevant and necessary to assess the factors influencing the stability of the lining and the search for rational technological conditions for its operation. A statistical analysis over a five-year period of the work of two 50-ton converters with top blowing, which was lined with periclase carbon heat-treated refractories, was conducted. It was established that the dependences of the lining stability on the consumption indicators of charge materials are extreme: the consumption of hot metal at the level of 920-930 kg/t of steel corresponds to the lowest indicators of the lining stability; scrap consumption at the level of 200 - 220 kg/t of steel and lime consumption at the level of 70-75 kg/t of steel correspond to the best working conditions of the lining. Regarding the chemical composition of processed hot metal, the best working conditions of the lining correspond to the content of silicon in it at the level of 0.80-0.85% of the mass and manganese - 0.50-0.60% of the mass. Researches shown that in order to more accurately interpret the impact of certain factors on the stability of the lining of oxygen converters, it is necessary to group factors by organizational and production characteristics and conduct a detailed analysis in each of the groups. According to the results of correlation and regression analysis, the equation was obtained, which allows to predict the stability of the lining of converters with a capacity of 50 tons. The resulting equation can be used in industrial conditions to predict the stability of the lining.
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