Title:
METHOD FOR ESTIMATING PHOSPHORUS CONCENTRATION IN MOLTEN STEEL, CONVERTER BLOWING CONTROL DEVICE, PROGRAM, AND RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2019/039539
Kind Code:
A1
Abstract:
[Problem] To accurately estimate the phosphorus concentration in molten steel during a decarburization treatment. [Solution] The present invention provides a method for estimating the phosphorus concentration in molten 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 gas flow 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.
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Inventors:
IWAMURA KEN (JP)
SUGIMOTO AKIHIRO (JP)
SUGIMOTO AKIHIRO (JP)
Application Number:
PCT/JP2018/031134
Publication Date:
February 28, 2019
Filing Date:
August 23, 2018
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C21C5/28; C21C5/46
Domestic Patent References:
| WO2018012257A1 | 2018-01-18 |
Foreign References:
| JP2017115173A | 2017-06-29 | |||
| JP2011202252A | 2011-10-13 | |||
| JP2012136767A | 2012-07-19 | |||
| JP2014037605A | 2014-02-27 | |||
| JPS5792121A | 1982-06-08 | |||
| JP2012167366A | 2012-09-06 |
Attorney, Agent or Firm:
KAMEYA, Yoshiaki et al. (JP)
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