Abstract
The article contains the results of studies of the influence of technological parameters of the extra-furnace rail steel processing in the conditions of the electric furnace shop of “EVRAZ ZSMK” JSC on the oxygen content in the finished rails and on their mechanical properties. The studies carried out using the multiple regression analysis showed that the oxygen concentration in the rail steel was reduced by 2 ppm with an increase in the duration of the inert gas blowing on the ladle-furnace unit to 100 min. At the same time, a decrease in the concentration and length of the rows of oxide brittle fracture nonmetallic inclusions, which have the most negative effect on the operational properties of the railway rails, was also recorded. In addition, the carried out experimental studies showed that the decrease in the concentration of oxygen in the rail steel by the specified amount, due to an increase in the duration of the blowing of the melt with an inert gas, makes it possible to increase the following mechanical properties of the rails: ultimate strength, elongation, relative constriction, hardness. Based on the conducted research, the technology of extra-furnace rail steel processing was developed and introduced at the electric steelmaking shop of “EVRAZ ZSMK” JSC in series on two “ladle-furnace” units, which allowed the recommended values of the duration of blowing with inert gas to be achieved without reducing the shop productivity.
Published Version
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