RH用低碳深脱硫预熔渣

为实现低碳、超低碳钢在RH中进行深脱硫且钢水不增碳,在200kg真空感应炉上对RH用低碳深脱硫预熔渣进行了脱硫试验研究,结果表明:以CaO-Al2O3-SiO2-MgO为主的低碳深脱硫预熔渣熔点低、脱硫率高,可在真空条件下将钢液中硫的质量分数由30×10-6~50×10-6脱至10×10-6~20×10-6以下,脱硫率达到55%以上,脱硫效果好,脱硫率稳定。该预熔渣中碳的质量分数小于0.05%,在脱硫过程中钢水几乎不增碳,适用于在RH中低碳、超低碳钢深脱硫。研究表明:适当地提高炉渣的光学碱度,可大大地提高其硫容量,增强炉渣的脱硫能力。使用该预熔渣处理钢水有利于钢中夹杂物的去除和细化。

Low-Carbon Pre-Melted Slag for RH Deep Desulphurization

In order to meet the requirements of RH deep desulphurization and no increasing the carbon in low carbon steel and ultra-low carbon steel, low-carbon pre-melted slag for RH deep desulphurization was studied on 200kg vacuum induction furnace. The results show that: low-carbon pre-melted slag whose main composition is CaO-Al2O3-SiO2-MgO, having low melting point and high desulphurization rate, could remove sulfur in molten steel from 30×10-6-50×10-6 to less than 10×10-6-20×10-6, with desulphurization rate more than 55%. Its desulphurization effect is perfect and its desulphurization rate is stable. Carbon content in this slag is less than 0. 05% with few carbon pick up in molten steel. The slag is suitable for medium and low carbon and super low carbon steel deep desulphurization in RH. And the results also show that: properly higher optical basicity can gain higher sulfur capacity to improve its desulphurization capability. Applying this pre-melted slag to treat molten steel is favorable for inclusion removing and fining.