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| Selection of calcium treatment technology of LF #br#
refining for different steel |
| XIAO Zunhu1，LIU Peng2，XU Gangjun2，ZHOU Junjun2，SUI Yafei2 |
(1. Company Office，Hunan Valin Lianyuan Iron and Steel Co.，Ltd.，Loudi 417000， Hunan， China；
2. Technology Center，Hunan Valin Lianyuan Iron and Steel Co.，Ltd.，Loudi 417000， Hunan， China) |
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Abstract In order to optimize LF refining calcium treatment process for different steels，the evolution mechanism of inclusions in high strength structural steel，low carbon structural steel，welded cylinder steel，wear resistant steel and high carbon steel during LF refining and calcium treatment was investigated. The results show that the longer the slagsteel reaction time，the more thorough the inclusion modified before calcium treatment. Before calcium treatment，Al2O3 is the main inclusion of welded cylinder steel，MgOAl2O3CaO composite is the main inclusion of high strength structural steel and low carbon structural steel，and Al2O3CaO inclusion with low melting point is the main inclusion of high carbon steel and wearresistant steel. The amount and the size of inclusions in molten steel can be increased in the process of calcium treatment. The key to control Al2O3SiO2MnO composite inclusions is to avoid SiMn alloying in the middle and late stages of LF refining. Considering all factors，it is suggested that the current amount of feeding calcium wire should be increased for welded cylinder steel，light calcium treatment process should be used for high strength structural steel and low carbon structural steel，and calcium treatment process should be cancelled for high carbon steel and wear resistant steel.
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