National University of Science and Technology “MISiS” (Moscow, Russia):

Tursunov N. K., Post-Graduate
Semin A. E., Dr. Eng., Prof., Deputy Head of the Chair “Metallurgy of Steel and Ferroalloys”

Casting and Mechanical Plant (Tashkent, Uzbekistan):
Sanokulov E. A., Director

E-mail: u_nadir@mail.ru

Desulphurization process of steel using rare earth metals and solid slagging mixtures mainly consists of CaO and Al₂O₃ has been simulated in the resistance furnace. 20GL steel has been used as the test metal. Quantitative relationships reflecting the final sulfur content in the metal depending on the treatment options, metal oxidation level have been obtained; This sulfur content is controlled by the aluminum content in the melt before adding of rare earth metals. The alloying composition based 50 % Ce and 25 % La has been used as rare earth metals. The article presents the calculation results of varying the sulfur content in the metal, depending on the residual content of cerium in the metal. The eff ect of the exposure duration on the final sulfur content in the metal, and on the nature of the changes in the residual content of cerium have been proved experimentally. Practical technological recommendations are given for the all process steps including metal holding in the furnace for alloy composition equalizing; steel deoxidation by aluminium; steel pouring in a tundish; ladle treatment with solid slag mixtures; steel deoxidation by silicocalcium; introduction of rare earth metals. Realization of this technology allows to decrease sulfur content in the metal doen to 0.006 %, as well as content of oxygen and non-metallic inclusions.

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