Results of theoretical and experimental studies of the physicochemical properties of slags of the CaO–SiO 2 –B 2 O 3 system containing 15% Al 2 O 3 and 8% MgO lie at the basis for the development of technology for exhaustive desulfurization of metal beneath basic boron-containing slags formed in a steelpouring ladle in a ladle-furnace unit (LFU), and steel direct microalloying with boron. Methods of simplex lattice planning of an experiment, a software complex HSC 6.1 Chemistry (Outokumpu), and the method of electro-vibration viscosimetry are used. Results of thermodynamic modeling of the effect of slag basicity and B 2 O 3 content on sulfur and boron equilibrium distribution coefficient between slag of the oxide system under study and low-carbon metal are presented. The quantitative effect of basicity and B 2 O 3 content on slag viscosity containing 15% Al 2 O 3 and 8% MgO at a temperature of 1600°C and the influence of the slag chemical composition of the oxide system under study on the degree of wear of periclase-carbon refractory material are shown. Results of studying physicochemical properties of slags of the CaO–SiO 2 –B 2 O 3 system containing 15% Al 2 O 3 and 8% MgO are a basis for developing a ladle slag composition with low viscosity and providing exhaustive metal desulfurization, and direct microalloying of boron steel with low corrosive effect on periclase-carbon refractories. Development of this technology provides, depending on the steel grade, a boron content of 0.001–0.008%, low metal sulfur concentration at 0.004–0.014%, a reduction in manganese ferroalloy consumption from 0.5 kg/ton of steel 08KP to 1.4 kg/ton of steel 09G2S, exclusion of ferroboron and fluorspar additives in the ladle, and achievement of good finished metal product mechanical properties.

中文翻译：

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碱性含硼渣下硼钢纯金属脱硫及直接微合金化的理论基础与技术

含有 15% Al 2 O 3 和 8% MgO 的 CaO-SiO 2 -B 2 O 3 系统炉渣理化性质的理论和实验研究结果为开发金属彻底脱硫技术奠定了基础。在钢包炉单元 (LFU) 中的钢包中形成的碱性含硼炉渣，以及钢与硼的直接微合金化。使用了实验的单纯晶格规划方法、软件复合体 HSC 6.1 Chemistry (Outokumpu) 和电振动粘度测定法。给出了炉渣碱度和 B 2 O 3 含量对所研究的氧化物系统炉渣与低碳金属之间硫和硼平衡分配系数影响的热力学模型结果。碱度和B 2 O 3 含量对1600℃下含15% Al 2 O 3 和8% MgO的渣黏度的定量影响以及所研究的氧化体系渣化学成分对熔渣黏度的影响显示了方镁石-碳耐火材料的磨损。含有 15% Al 2 O 3 和 8% MgO 的 CaO-SiO 2 -B 2 O 3 体系渣理化性质的研究结果是开发低粘度钢包渣组合物和提供彻底的金属脱硫的基础，并直接对方镁石-碳耐火材料具有低腐蚀作用的硼钢微合金化。根据钢种，该技术的发展提供了 0.001-0.008% 的硼含量，0.004-0.014% 的低金属硫浓度，锰铁合金消耗量从 0.