Low Phosphorus Partition Ratio Models

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Low Phosphorus Partition Ratio Models Rezumat: Phosphorus is a key impurity which dating slag slags predominantly the ductility of the finished product and so it is essential that methods are employed to keep the levels of phosphorus in a controlled and desirable range. General control of phosphorus content is carried out by a plant specific dephosphorization process which is a model that is honed by continuous monitoring and adjustment.

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A real steelmaking process involves many complex physical and chemical coupled phenomena such as oxidation, decarburization, dephosphorization, and slag formation. Phosphorus is an element of representative impurities that should be kept as low as possible in conventional steel grades. Low phosphorus content steels are essential for steel applications where high ductility is required, such as thin sheets, deep drawn structures, pipelines, and automobile exteriors.

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The main source of phosphorus in steel is from the raw materials; thus, raw material selection is a way to maintain the phosphorus content within the desirable range. In BOF oxygen steelmaking it is difficult to predict the distribution of phosphorus between slag and metal by direct application of models listed in Table 1even though white rasist dating site pseudo-steady state is usually attained between slag and metal towards the end of the blow.

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This is because under practical shop-floor conditions, besides the slag composition and temperature, the phosphorus distribution is found to depend also upon dating slag slags parameters, such as slag mass, turndown carbon, initial phosphorus content of metal, intensity of bottom stirring, lance height, oxygen flow rate, addition scheme and timing of addition of fluxes and iron ore.

Therefore, each plant usually develops its own blowing practice and, on the basis of analysis of plant data, adapts a suitable model for control and prediction of phosphorus at tap.

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The selection of a control model is not a simple task. On the other hand, it is well known that the phosphorous distribution between slag and metal LP is generally lower dating slag slags to 50 for EAF steelmaking than for oxygen steelmaking 50 to The phosphorus [P] removal in BOS steelmaking is generally described by the ionic reaction shown in equation 1.

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  • Rezumat: Electroslag remelting can be summarized as a secondary refining process through consumable electrode remelting.
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From 1 it can be seen that a high [P] activity, high oxygen potential [O] and high basicity O2- all promote phosphorus removal. Also, [P] removal may also be represented by the simple molecular reaction, given in equation 2allowing a Gibbs free energy to be calculated using equation 3.

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The equilibrium constant of this reaction is given by equation 4 It is generally agreed that LP increases with slag basicity and oxygen activity and decreases with increasing temperature.

References 1.

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Hassan A. I, Kotelnikov G. I, Semin A. E, Megahed G. Shin, C. Wee, M. Kim, B. You, J. Han, S. Choi, D. Assis, M. Tayeb, S. Sridhar, R. B, Halder. J, Snoijer. B, Overbosch.

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A, Boom. Manning, R. Fruehan: The rate of the phosphorus reaction between liquid iron and slag, Metallurgical and Materials Transactions B, Vol. Kunisada, H. Drain, B. Monaghan, G. Zhang, R. Longbottom, I. Dating slag slags, M.

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