Method for estimating phosphorus concentration in molten steel, converter blowing control device, program, and recording medium
A control device, converter blowing technology, applied in the direction of manufacturing converters, manufacturing computing systems, process efficiency improvement, etc., can solve the large deviation of phosphorus concentration, low reproducibility of dephosphorization action, difficulty in suppressing the deviation of phosphorus concentration, etc. question
Active Publication Date: 2020-04-17
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.
Method used
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Embodiment
[0158] 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 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 a following example.
[0159] Regarding Examples and Comparative Examples, the phosphorus concentration in molten steel at the time of sublance measurement was calculated, respectively. The phosphorus concentration in molten steel is obtained by substituting the dephosphorization rate constant k obtained by the above formula (4) into the above formula (2). Hereinafter, the calculated phosphorus concentration in molten steel is referred to as an "estimated value".
[0160] In addition, in order to verify...
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An aim is to accurately estimate the phosphorus concentration in molten steel during a decarburization treatment. The present invention provides a method for estimating the phosphorus concentration inmolten steel during a decarburization treatment by a converter when not carrying out a dephosphorization treatment prior to the decarburization treatment or when carrying out dephosphorization treatment using different equipment from the converter used in the decarburization treatment. The method includes: an exhaust gas data acquisition step of acquiring exhaust gas components and an exhaust gasflow rate; a molten steel data acquisition step of acquiring the molten steel temperature and carbon concentration of the molten steel by means of sub-lance measurement; and a phosphorus concentration estimation step of calculating a dephosphorization rate constant using data pertaining to decarburization oxygen efficiency obtained on the basis of the exhaust gas components and the exhaust gas flow rate, data pertaining to the exhaust gas components, the exhaust gas flow rate, the molten steel temperature, and the carbon concentration, and operation conditions pertaining to the decarburization treatment, and using the calculated dephosphorization rate constant and the phosphorus concentration in the molten steel at the start of the decarburization treatment to estimate the phosphorus concentration in molten steel after the sub-lance measurement.
Description
technical field [0001] The invention relates to a method for estimating phosphorus concentration in molten steel, a converter blowing control device, a program and a recording medium. 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 amount of operation. These operating amounts are often determined based on information obtained before blowing starts, such as target phosphorus concentration, molten iron data, and sta...
Claims
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IPC IPC(8): C21C5/28C21C5/46
CPCC21C5/28C21C5/46Y02P90/30Y02P10/25C21C5/285C21C5/30C21C5/462
Inventor 岩村健杉本明大
Owner NIPPON STEEL CORP