LF精炼脱氧方式对钢中氧含量和夹杂物演变规律的影响

摘要/Abstract

摘要： 近年来，用户对钢铁材料的使用性能要求越来越苛刻，提高钢水洁净度、合理控制钢中夹杂物已成为各个钢铁企业的重要任务，而钢中氧化物夹杂过多与脱氧过程密不可分。通过工业试验和X荧光分析仪、扫描电子显微镜等手段系统地研究了不同脱氧方式对70号钢精炼过程钢中总氧含量、夹杂物演变规律和炉渣氧化性的影响。试验结果表明，不同脱氧方式对70号钢中夹杂物的类型和尺寸影响不大。采用分两阶段、每阶段3批次添加Si-Ca脱氧可进一步降低炉渣氧化性和夹杂物水平，铸坯的T.O质量分数和氧化物夹杂数量可分别控制到0.001 3%~0.001 5%和10.2~11.3个/mm2，研究结果可为高品质制绳级别细钢丝用高碳钢的高洁净化控制提供理论依据和技术指导。

关键词: 脱氧方式, 70号钢, 总氧含量, 炉渣氧化性, 夹杂物

Abstract: In recent years，various industries have higher requirements on the service performance of steel materials，so continuously improving the cleanliness of steel and reasonably controlling inclusions in steel have become important tasks for various steel enterprises，and the excessive oxide inclusions in steel are related to the deoxidization process. In this paper，through industrial test，X-ray fluorescence analyzer and scanning electron microscope (SEM)，the effect of deoxidation methods on the total oxygen content，inclusion evolution and slag oxidizability of No.70 steel has been systematically studied. The experimental results showed that different deoxidization methods had little effect on the types and sizes of inclusions in No.70 steel. The deoxidation method of adding 1.2kg/t Si-Ca compound deoxidizer in two stages and three batches per stage was to the benefit of reducing slag oxidizability and further removal of oxygen content in steel，so as to control the slab of No.70 steel with lower total oxygen content and amount of oxide inclusions. Using this deoxidation method，the total oxygen content could be controlled between 0.001 3% and 0.001 5%，and number of oxide inclusions could be controlled between 10.2--11.3/mm2. The results of this study can provide theoretical basis and technical guidance for the high-purity control of high carbon steel used for high quality rope grade fine steel wire.

Key words: deoxidation method, No.70 steel, total oxygen content, slag oxidizability, inclusion

操瑞宏1，王学林1，孙乐飞1，李杰2，李孟华2，万勇2 . LF精炼脱氧方式对钢中氧含量和夹杂物演变规律的影响[J]. 炼钢.

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LF精炼脱氧方式对钢中氧含量和夹杂物演变规律的影响

Effect of deoxidation method on the total oxygen content and inclusion evolution during LF refining process

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