RH-MFB生产过程对夹杂物的影响分析

Analysis on effect of RH-MFB processing on inclusion

对湖南华菱涟源钢铁集团有限公司新转炉炼钢厂RH-MFB冶炼超低碳IF钢生产进行了研究,分析转炉出钢中碳氧含量和温度、真空循环时间、冶炼渣成分等因素对钢液中夹杂物数量、粒径分布的影响。对RH精炼过程中工艺参数进行了优化。使该厂在生产IF超低碳钢时达到w(C)≤30×10-6、w(N)≤30×10-6、w(O)≤20×10-6的技术要求,钢液成分及质量稳定。

The experiments are carried out on refining the ultra-low carbon IF steel by RH-MFB processing route in the new Converter Refining Steel-making Plant of Lianyuan Iron ＆ Steel Group Corporation and the effects of oxygen and carbon contents as well as temperature in steel, time of vacuum cycle and chemical compositions of the refining flux on the quantity and size distribution of inclusions in steel are analyzed and studied. The technological parameters of RH refining are optimized as well. As the resuits the ultra-low carbon IF steel produced in the plant conforms to the technological specifications of w（C）≤30 × 10-6 ,w（N）≤30 ×10-6 ,w（O）≤20 × 10-6 and the chemical compositions and quality of the steel are consistent.