Effect of multi-strand tundish structure on flow consistency and steel cleanliness
In order to improve the utilization rate of casting machine and steel output in a steel plant,an existing 6-strand tundish was modified into a 7-strand one.The temperature difference of molten steel and inclusions in the casting billet before and after modification were compared by industrial trail.The results show that the modified tundish improves not only the yield of the billet,but also the billet quality.Taking the cord steel as an example,the maximum temperature difference of the molten steel between strands in the 7-strand tundish is reduced from an aver-age of 4.3 ℃ to 3.0 ℃ compared with the 6-strand tundish.The standard deviation of molten steel temperature in each flow is reduced by 32.4％,which is conducive to the stabilization of the superheat for each flow and the solidi-fication structure of the billet.In addition,the content of micro-inclusions in the billet decreases from 4.52 mg/10 kg on average to 1.62 mg/10 kg.The average number density of micro-inclusions and the standard deviation between strands are decreased by 47.6％and 87.9％,respectively.The cleanliness and flow consistency of the billet are sig-nificantly improved,indicating that the different tundish flow control devices have a certain influence on the cleanli-ness of the molten steel,which should be paid enough attention in industrial production.The above phenomenon is explained by the physical simulation of the tundish flow field.The research results can provide reference for the op-timization and transformation of multi-strand tundish.
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