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Improvement on mechanism of nozzle clogging caused by CaS inclusions in Al-killed cold heading steel |
ZHAO Jia-qi1, CAI Xiao-feng1, MA Jian-chao1, LI Jie2, ZHANG Lian-bing1 |
1. Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China; 2. Converter Steelmaking Plant, Shasteel, Zhangjiagang 215625, Jiangsu, China |
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Abstract Through the research of nozzle clogging in the casting process of Al-killed cold heading steel, the nodules are C12A7, CaS, a little mount of MgO and TFe, etc, and the main reason for the nozzle clogging is the inclusions with a high percentage of CaS which is up to 36.91%. Combined with the production process, it is found that a large number of CaS inclusions will be formed when the w([S]) or the calcium content in molten steel is too high. Through a series of measures, such as improving deoxidization and slagging process, optimizing calcium treatment process, etc, w([S]) in the molten steel before calcium treatment is controlled below 0.005 0%, and the w([Ca]) after calcium treatment is controlled within 0.001 4%-0.002 6%, the result is that the modification of Al2O3 inclusions in molten steel is sufficient, and the formation of CaS inclusions causing nozzle clogging is avoided. The problem of nozzle clogging caused by CaS inclusions is effectively solved, and the castability of molten steel of aluminum killed cold heading steel is improved, the number of continuous casting heats is increased from 10 to 16 on average.
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Received: 10 December 2020
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