Smirnov L.А., Shulmin D.S., Smirnov A.L., Deryabin Yu.А., Dovgolyuk L.V. Ladle dephosphorization of low-carbon steel semi-product during the processing of iron containing vanadium by a fluxless monoprocess

Abstract

The study of the secondary dephosphorization processes of low-carbon steel semi-product was made. The treatment of metal by slag-forming mixture CaO-FeO-CaF2 was carried out when tapping in the ladle. The possibility of obtaining a dephosphorization degree of about 50-60% at the initial phosphorus content in metal of 0.050-0.060% and a mixture flow of 3% by weight of metal was found. The optimum composition of dephosphorization slag was established: CaO / FeO = 3.5-4.0, (CaO) ≈ 70-75%, (FeO) ≈ 20%. The paper contains information about the perspectives of powder dephosphorization mixture blowing to increase a degree of metal dephosphorization up to 80-90% and achieve [P]final ≤ 0.005%.

Keywords

Fluxless monoprocess, ladle dephosphorization, solid slag mixture.

Smirnov Leonid Аndreevich – Academician of the Russian Academy of Sciences, D.Sc. (Eng.), Professor, Scientific Director of the Institute, Ural Institute of Metals, Ekaterinburg, Russia. Phone: +7(343)374 03 91. E-mail: uim@ural.ru.

Shulmin Dmitry Sergeevich – Postgraduate Student, Junior Researcher, Ural Institute of Metals, Ekaterinburg, Russia.

Smirnov Andrey Leonidovich – Senior Engineer, Ural Institute of Metals, Ekaterinburg, Russia.

Deryabin Yury Аndreevich – D.Sc. (Eng.), Head of the Steelmaking Department, Uralgipromez, Ekaterinburg, Russia. E-mail: info@uralgipromez.ru.

Dovgolyuk Lyudmila Vasil'evna – Engineer, Ural Institute of Metals, Ekaterinburg, Russia. E-mail: uim@ural.ru.

1. Smirnov L.A., Deryabin Yu.A., Dovgolyuk L.V. Vanadium behavior during blowing of vanadium hot iron. Report 2. News of higher educational institutions. Ferrous Metallurgy, 1979, no. 12, pp. 30-33.

2. Smirnov L.A., Rovnushkin V.A., Smirnov A.L. A new technological procedure of processing iron containing vanadium by fluxless BOF process. Collection of papers of the 13th International congress of steelmakers. City of Polevskoy, 12th-18th of October, 2014. Moscow – Polevskoy, 2014, pp. 143-147.

3. Ladyzhensky B.N. Using powder materials in steelmaking. Moscow: Metallurgy, 1973, 312 p.

4. Sidorenko M.F. Theory and practice of powder injection to metal. Moscow: Metallurgy, 1973, 303 p.

5. Bannenberg N., Lachmund H. Metallurgical procedures to achieve very low phosphorus contents. Revue metalurgie (Fr.), 91 (1994), no.7-8, pp. 1043-1054, V-VI.

6. Healy G.W. A new look on phosphorus distribution. Journal of The Iron and Steel Institute, 1970, vol. 208, pp. 664-668.

7. Development of ladle steel dephophorization in NKK / Kikuchi Y., Takahashi К., Kawai Y., Kavakami К., Tenma H., Taguchi К. Injection Metallurgy’83. Collection of papers. Translated by Babich V.K. et al., edited by Sidorenko M.F. Moscow: Metallurgy, 1986, pp. 67-78.

8. Takeshi N., Mitsumoto H., Siro М. The equilibrium distribution of phosphorus between FeOt-CaO-P2O5-SiO2-MgO slag system and liquid iron. Tetsu-to-Hagane, 1985, 71, no.12, p. 903.

Details: Published: 09 September 2015; Last Updated: 09 September 2015; Hits: 2797