Method for estimating phosphorus concentration in molten steel and converter blowing control device
A control device, converter blowing technology, applied in the manufacture of converters, etc., can solve the problems of difficulty in suppressing the deviation of phosphorus concentration, large deviation of phosphorus concentration, and low reproducibility of dephosphorization
Active Publication Date: 2018-11-09
NIPPON STEEL CORP
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Problems solved by technology
[0003] However, even under the same operating conditions, the reproducibility of the dephosphorization behavior in actual blowing is low, and there is a problem that the phosphorus concentration in molten steel varies greatly when the blowing is stopped.
Therefore, in the blowing based on the operation amount determined only based on the information obtained before the start of blowing as described above, it is difficult to suppress the variation in the phosphorus concentration in molten steel when the blowing is stopped.
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[0156] Next, examples of the present invention will be described. In order to confirm the effect of the present invention, in this example, the estimation accuracy of the dephosphorization rate constant k and the phosphorus concentration in molten steel obtained by the method for estimating the phosphorus concentration in molten steel according to the present embodiment was verified. In addition, the following examples are performed only for verifying the effect of this invention, and this invention is not limited to the following examples.
[0157] In Comparative Example 1, the operational factors shown in Table 1 above were used as explanatory variables used in the regression equation represented by the above formula (4). On the other hand, in Example 1, as explanatory variables, in addition to the operational factors shown in Table 1 above, the average value of the time-series data of the slag level at the end of blowing during dephosphorization was used. In Example 2, as ...
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To estimate the phosphorus concentration in molten steel with high precision when converter blowing is stopped in an operation that uses a multi-refining converter method. A method for estimating thephosphorus concentration in molten steel is used in primary refining using a converter that involves an intermediate slag removal process and comprises: a slag level data-acquiring step for acquiringthe slag level during a dephosphorizing process; an effluent gas data-acquiring step for acquiring effluent gas components and effluent gas flow during a decarbonization process; a molten steel data-acquiring step for acquiring the molten steel temperature and carbon concentration in the molten steel by sublance measurement during the decarbonization process; and a phosphorus concentration-estimating step for calculating a dephosphorization rate constant using data relating to the slag level, effluent gas components, effluent gas flow, molten steel temperature and carbon concentration as wellas operating conditions relating to the dephosphorization process, intermediate slag removal process and decarbonization process, and using the calculated dephosphorization rate constant and the molten pig iron phosphorus concentration at the beginning of the dephosphorization process, estimating the phosphorus concentration in the molten steel during the decarbonization process after the sublancemeasurement.
Description
technical field [0001] The present invention relates to a method for estimating phosphorus concentration in molten steel and a device for estimating phosphorus concentration in molten steel for estimating with high precision the phosphorus concentration in molten steel when converter blowing is stopped during operation based on the multifunctional converter method. Background technique [0002] In converter blowing, the control of the composition of the molten steel (especially the control of the phosphorus concentration in the molten steel) when the blowing is stopped is very important in the quality management of steel. In order to control the concentration of phosphorus in molten steel, the oxygen blowing amount, the input amount of auxiliary raw materials such as quicklime or scale, the input timing of the auxiliary raw materials, the height of the top blowing lance, the flow rate of top blowing oxygen and the flow rate of bottom blowing gas are generally used. Do the am...
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IPC IPC(8): C21C5/46C21C1/02C21C5/28
CPCC21C1/02C21C5/28C21C5/46Y02P10/25
Inventor 岩村健杉桥敦史沼田政宪久米康介
Owner NIPPON STEEL CORP