RH精炼钢中全氧量变化与操作改进

Variation of total oxygen in RH refining and operation improvement

为了使钢中全氧量控制在一个适当的水平,在武钢炼钢总厂RH真空脱气装置对低碳、超低碳钢进行了脱氧净化试验.结果表明,影响全氧去除的因素按作用高低依次是出钢溶解氧水平,溶解氧与钢包渣的交互作用,钢包渣,和真空处理净化时间.通过改进工艺生产了全氧量≤10×10-6,非金属夹杂物尺寸<10μm的清洁钢水,建立了一个钢包内钢水全氧浓度随时间变化的新方程,该方程考虑了全氧的表观平衡含量及环流、扩散传质对去除氧化物夹杂速率的影响.

In order to control the total oxygen at an appropriate level,investigations on deoxidation and purification were carried out in ultra-low carbon and low carbon steels by means of the RH vacuum degasser in the General Steelmaking Mill,Wuhan Iron & Steel Co. Ltd. The results show that influential factors of total oxygen removal in the order from main to subordinate are the free oxygen level in the tapping molten steel,interaction between the free oxygen and slag,slag in the ladle,and the vacuum treatment time,respectively. The clean molten steel with a total oxygen content of 10×10-6 and nonmetallic inclusions less than 10 μm in size was produced by the optimizing process. A new equation involving the change of total oxygen concentration via the ladle with time is approved,which considers the influences of apparent oxygen equilibrium content,circulation,and diffusion mass transfer on the removal rate of oxide inclusions.