Abstract
AbstractThe study on the behaviour of decarburization, temperature increase, change of phosphorus and oxygen content of liquid steel during reblow process was presented in this paper. On the basis of traditional three-stage decarburization theory and thermal equilibrium theory, models for the variation of carbon content and temperature were established. Moreover, with application of data mining method, models for change of phosphorus and oxygen content were built based on large amount of production data and thermodynamic theory. By considering the variation of composition and temperature of molten steel, the reblow model was obtained and the software for reblow operation was developed with the combination of production technology. The test results indicated that the reblow rate (reblow more than once) dropped from 3.99 % to 0, and the average tap to tap time was reduced from 37.43 min to 36.35 min. It could provide an effective solution for medium-high carbon steel melting.
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