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通过对LF炉精炼原理及冶金功能进行分析,对昆钢LF炉精炼工艺进行了优化和设备改造。工艺优化和设备改造后:精炼渣碱度由4.33提高到6.20,渣中w(FeO)由2.56%降至1.0 5%,脱硫率达到50%以上,吨钢的电极消耗由0.73 kg降至0.50 kg,电极被击穿漏水、链条断裂等事故率降低;品种钢铸坯低倍组织中心裂纹、非金属夹杂物由0.5~1.5级降至0.5级,夹杂物尺寸由原来的平均89 um降至47 um,铸坯综合合格率由97.5%提高到99.2%,铸坯质量和合格率明显改善。
By analyzing the refining principle and metallurgical function of LF furnace, the refining process of LF furnace in Kunming Iron and Steel Co., Ltd. was optimized and the equipment was reformed. After process optimization and equipment reforming, the basicity of refining slag increased from 4.33 to 6.20, the w (FeO) in the slag decreased from 2.56% to 1.05%, the desulfurization rate reached over 50% and the electrode consumption per ton of steel decreased from 0.73 kg to 0.50 kg, the breakdown rate of the electrodes was reduced, and the rate of accidents such as chain rupture decreased. The center cracks and non-metallic inclusions in the low magnification of steel billets decreased from 0.5 to 1.5 to 0.5, and the size of inclusions decreased from 89 um 47 um, the overall passing rate of the slab increased from 97.5% to 99.2%, the slab quality and passing rate improved significantly.