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Stages of Improvement for Welded Structures with Five-Nozzle Lance Heads in the Converter Shop of Public Joint Stock Company “Dneprovsky Metallurgical Combine”

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Steel in Translation Aims and scope

Abstract

For the upper blasting lances of 250-ton oxygen converters at PJSC “Dneprovsky metallurgical combine” (Kamenskoe, Ukraine), a number of welded structures of five-nozzle lance heads with increased resistance are proposed. A set of industrial studies regarding their operation made it possible to establish that the devices which provide cooling of the areas from the tip’s nozzle zone have the highest resistance. Measures to increase the values of the average cooler speeds in welded structures of the lance heads and increase their rigidity also turned out to be quite effective. The transfer of copper welds that hold the nozzle inserts in the copper tip from its outer surface to the inner surface was ineffective in terms of increasing the resistance of the lance head. The average resistance of the heads increased by only seven heats—from 78 to 85. This suggests the need for complete elimination of copper welds in the head (both external, exposed to high-temperature and mechanical stress, and internal), which hold the nozzle inserts in the holes of the welded tip and lance head collector. Thus, all the measures carried out (the transfer of the welds from the tip’s outer surface to its inner surface, improving the cooling of the tip and its back from the nozzle zones, which also include sections of copper welds around the nozzles, as well as increasing the rigidity of the blast welded structure heads), led to positive but relatively low results. The data obtained indicate that the welds made of copper around the nozzle inserts, which are thus held in the head’s tip (also in the collector), are the limiting link that does not significantly increase the resistance of the welded lance heads.

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Notes

  1. In the designs of lance heads with forged-stamped tips, there are also internal welds made of copper connecting the upper and lower parts of the nozzles, which are one-piece products with a copper collector and tip, respectively. These welds are made by the method of furnace welding (soldering) and are intensively cooled so that they have high quality and strength.

  2. The research was carried out under the management of Doctor of Technical Sciences, Professor A.G. Chernyatevich.

  3. The research was carried out under the guidance of the author of this work.

  4. In studies at different stages, the following researchers took part: V.V. Nesvet, L.M. Uchitel, A.G. Rod, V.V. Ivko, Yu.P. Makhlai, B.Yu. Grebenyuk, B.L. Kuzminykh, V.G. Mazai, K.V. Nesvet, A.A. Sitalo, V.V. Motsny, V.A. Deripasko, A.P. Zhidkov, O.G. Usenko, V.A. Volok, Yu.I. Kharchenko, V.E. Oliyar, D.V. Sidorin, L.V. Kadatsky, V.M. Beloshevsky, A.N. Sokolov, T.I. Loseva, V.V. Zhenilov, A.S. Galaganov, A.N. Khrisanfov, and Yu.A. Chalenko.

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  1. Dniprovsk State Technical University, 51918, Kamenskoye, Dnepropetrovsk region, Ukraine

    S. P. Panteikov

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Translated by V. Selikhanovich

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Panteikov, S.P. Stages of Improvement for Welded Structures with Five-Nozzle Lance Heads in the Converter Shop of Public Joint Stock Company “Dneprovsky Metallurgical Combine”. Steel Transl. 50, 756–761 (2020). https://doi.org/10.3103/S0967091220110108

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