In the process of decarbonization by vacuum treatment, there are three reaction positions in the vacuum chamber of vacuum furnace, namely, the surface of molten pool, the surface of argon bubbles and the molten pool. Vacuum treatment is based on thermodynamics and kinetics of metallurgical reaction.
It can be understood that thermodynamics represents the stable content and controllable accuracy of the final state of the chemical reaction, and dynamics represents the time required to complete the chemical reaction process and form the final product. From the thermodynamic point of view of decarburization, decarburization, oxygen in molten steel and vacuum conditions are based on the influence of pressure on chemical reaction. When gas pressure decreases, chemical reaction ([C]+ [O] CO) is promoted. From the point of view of decarbonization kinetics, it is mainly to study how long it takes to reach the equilibrium value, that is, the required target carbon content.
Through the optimization of process parameters and operation process, the spattering of vacuum decarbonization process was effectively controlled, the ignition failure of top gun was significantly reduced, and the replacement frequency of hot elbow was greatly reduced, which increased from 280 times to 563 times on average, and the productivity of RH furnace was improved. Deep decarbonization time decreased from 20 minutes to 15 minutes, carbon content decreased from 20 ppm to less than 15 ppm after decarbonization, and the hit rate of terminal temperature also increased significantly. In addition, the life of the impregnated pipe increased from 60.9 times to 87.5 times, and the life of the bottom groove increased from 172.4 times to 21.4 times, resulting in obvious economic benefits.
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