Measures and New Technologies for Prevention of Defects of Continuous Casting Billet
1 Introduction
The continuous casting billet is the main form of production and processing of steel strips. Its quality and efficiency directly affect the quality of the steel strip, the production rate of steel strip, the normal operation of the subsequent process, and also directly influence the production cost. Therefore, it is of great practical significance to reduce the defects of the continuous casting billet and improve its quality.
2 Measures and New Technologies for Prevention of Defects of Continuous Casting Billet
2.1 Effective control of molten steel quality
Due to the multi-level nature of the defects of the continuous casting billet, the most effective measure is to effectively control the quality of the molten steel. Firstly, before the smelting process, we need to accurately analyze the characteristics of the poured steel, then correctly estimate its smelting difficulty, pre-adjust the reasonable proportion of raw materials and additives, and then optimize the reasonable pouring sequence of slags and steel, then proceed to the reasonable preparation of nitrogen, oxygen and other parameters, and finally strive to make the molten steel fully consistent with the requirements.
Secondly, during the smelting process, we need to pay attention to the fluctuations of the molten steel temperature and the analytical results of the molten steel, and accurately adjust the local atmosphere, electrode distance and other parameters of the furnace, so as to make a balanced control of the sulfur, phosphorus, oxygen and other elements in the steel; pays attention to the high temperature foam characteristics of the steel liquid, timely and reasonable grasp the foam destroying agent and its dosage, control the slobbery effectively and reduce the rolling end defects of the steel strip.
In addition, during the smelting process, it is necessary to strictly control the composition of molten steel, the size and quantity of the crucible bottom, the amount of the ladle and steel liquid storage time and the transportation time of the ladle, so as to effectively prevent the non-metal freezing and burning phenomena, and ensure the high quality of continuous casting billet.
2.2 Improve the control of continuous casting process
In addition to controlling the quality of the steel liquid, it is also important to monitor and adjust the parameters of the continuous casting process in real time. Laying of thin slab continuous casting requires a small gap between the tundish and blast nozzle, and reasonable match of the molten steel flow. The tundish should be preheated and the spraying system should be fully used to break the skin, improve the surface quality of the billet and reduce the porosity of the section. At the same time, reduce the oscillation of the tundish, adjust the water cooling system, the water spraying size and shape, the spraying time and pressure, et cetera, so that the pouring velocity and the skin velocity of the billet are matched, and the defects of the billet can be effectively prevented even at higher speed.
2.3 Apply New Technologies
In practical applications, some new technologies can also be adopted for the continuous casting billet to prevent defects. For example, new steel circulation technology can be adopted to improve the quality of steel liquid, reduce the unit power consumption and ensure the continuous and stable production of continuous casting billet. At the same time, with the application of artificial intelligence and the intelligent technology of automatic control, it can realize the real-time adjustment of the parameters of the continuous casting process, so as to effectively reduce the steam jacking, blowing, stop and other faults, and greatly reduce the defects of the continuous casting billet.
3 Conclusion
In summary, reducing the defects of continuous casting billet can effectively improve the product quality and production rate of the steel strip, and reduce the production cost of enterprises. Meanwhile, in order to achieve this purpose, we have introduced different control methods and new technologies, including the effective control of molten steel quality, the improvement of continuous casting process parameters and the application of modern technology. Through the full implementation of these measures, we believe that the continuous casting billet defects of enterprises can be effectively prevented and the production quality can be effectively improved.
