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: This email address is being protected from spambots. You need JavaScript enabled to view it..

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: This email address is being protected from spambots. You need JavaScript enabled to view it..

Dovgolyuk Lyudmila Vasil'evna – Engineer, Ural Institute of Metals, Ekaterinburg, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

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: 2692