Fundamental Research as a Basis for the Creation of New Technologies in Steel Ladle Metallurgy

Abstract

Theoretical and experimental studies including a study of slag viscosity of the CaO-SiO2-B2O3 system containing 25% Al2O3 and 8% MgO and equilibrium interphase distribution of sulfur and boron between slag and a low-carbon metal were carried out using a simplex-lattice experiment design and HSC 6.1 Chemistry software (Outokumpu). Fundamental research has contributed to the development of technology of basic boron-containing slags formation in ladle at ladle-furnace. These slags have a low viscosity, retaining high refining properties and providing direct microalloying of steel by boron. This technology has no analogues in domestic and foreign practice. The development of technology in the converter plant AO "ArcelorMittal Temirtau" (Kazakhstan) provided low-carbon steel production in wide grade composition, containing 0.001-0.008% boron and 0.004-0.014% sulfur, decreased consumption of manganese, high mechanical properties of rolled metal and improved environmental conditions.

Theoretical and Experimental Studies of Sulfur and Boron Distribution between the Slag of the CaO-SiO₂-B₂O₃-MgO-Al₂O₃ System and the Metal

“…One of the ways to solve this problem is to use boron oxide instead of fluorspar. This oxide is able to reduce the crystallization temperature and slag viscosity, providing effective metal desulfurization [9][10][11][12][13][14][15][16]. In addition, when boron oxide is used in the slag, the process of boron reduction occurs [14].…”

“…This oxide is able to reduce the crystallization temperature and slag viscosity, providing effective metal desulfurization [9][10][11][12][13][14][15][16]. In addition, when boron oxide is used in the slag, the process of boron reduction occurs [14]. As is known [17,18], microalloying of steel by boron promotes an increase in the strength of steel without a decrease in ductility.…”