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.

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