Abstract：In order to improve the decarbonization effect of RH and reduce the refining cycle, the RH decarburization was analyzed from the thermodynamics and dynamics theory, and the dynamic control process optimization of the RH decarbonization process was carried out in practice. After the optimization of oxygen blowing and aluminum heating process, the carbon qualified rate of ultra-low carbon steel products was increased from about 94% to 100%. The carbon can be removed to about 0.002% after 10 min of RH treatment. Compared with the process before optimization, the carbon mass fraction of finished products decreased from 0.001 5%-0.002% to 0.001%-0.001 4%. The effect of pressure drop on the decarburization rate was studied. The results showed that the faster the pressure drop, the higher the decarbonization rate. Pre-vacuum can improve the decarburization efficiency and obtain a lower end carbon content. The relationship between the oxygen content and carbon content at the end of decarburization was studied. The results showed that the decarbonization end oxygen mass fraction was within 0.025%-0.035%, which could meet the requirement that the decarbonization end carbon mass fraction was less than 0.002%.
刘彬, 陈永洪, 杨龙川, 汤海明. 250 t钢包RH精炼脱碳动态控制实践[J]. 中国冶金, 2020, 30(5): 70-75.
LIU Bin, CHEN Yong-hong, YANG Long-chuan, TANG Hai-ming. Dynamic decarburization control practice for 250 t steel ladle RH refining[J]. China Metallurgy, 2020, 30(5): 70-75.
Huin D,Saint-Raymond H,Stouvenot F,et al. Kinetics of vacuum decarburization of ultra low carbon steels[C]//Steelmaking Conference Proceedings. Baltimore:Metallurgical Industry Press,2001:132.
[4]
Suda M,Suitou M,Hasunuma J,et al. The advanced mass production system of ultra low carbon steel at Ksc's Mizushima Works[C]//Steelmaking Conference Proceedings. Toronto:Metallurgical Industry Press,1992:229.
[5]
Yamaguchi K,Kishimoto Y,Sakuraya T,et al.Effect of refining conditions for ultra low carbon steel on decarburization reaction in RH degasser[J].ISIJ International,1992,32(1):126.
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