Continuous Casting Process Steps
Continuous Casting Process Steps
Continuous casting is an intermediate link connecting steelmaking and rolling, and is an important part of a steelmaking plant (or workshop). The process flow of continuous casting production is: ladle → tundish → mold → secondary cooling → billet straightening → cutting → roller conveying → pusher → casting billet.
How is the continuous casting process steps?
1 Overview
Continuous casting is an intermediate link connecting steelmaking and rolling, and is an important part of a steelmaking plant (or workshop).
The process flow of continuous casting production is: ladle → tundish → mold → secondary cooling → billet straightening → cutting → roller conveying → pusher → casting billet. The application of continuous casting technology has completely changed the production process and logistics control of steelmaking workshops, providing conditions for the continuous production of workshops, the application of automation and information technology, and the substantial improvement of the environment and product quality.
In addition, the development of continuous casting technology will also drive the development of other industries in the metallurgical system, and play an important role in promoting the simplification and optimization of enterprise organizational structure and product structure.
2 Features of Continuous Casting Process
The continuous casting process steps is a process in which molten steel releases sensible heat and latent heat and gradually solidifies into a cast slab of a certain shape in a continuous state.
During the transition from liquid to solid, there are momentum, heat and mass transfer, phase transition, deformation caused by external force and stress in the system. These processes are very complex and often coupled or interact with each other. Compared with the die casting-blooming process, the continuous casting process has the following advantages.
(1) The process flow of casting billet production is simplified, and the demoulding, moulding, ingot soaking and billeting processes of the die casting process are omitted, the capital construction investment can be saved by 40%, the floor space can be reduced by 30%, and the operating cost can be reduced by 30%. It can save 40%, and the consumption of refractory materials can be reduced by 15%.
(2) The metal yield is improved, on the one hand, the loss of cutting head and tail of the billet is greatly reduced; The metal loss is reduced, and the metal yield can be increased by about 9%.
(3) The energy consumption in the production process is reduced, the combustion power consumption of the soaking furnace for ingot blanking can be omitted, and the energy consumption can be reduced by 1/4 to 1/2.
(4) The level of mechanization and automation of the production process has been improved, which has created favorable conditions for the improvement of labor productivity and the modernization and management of enterprises.
3 The Development of Continuous Casting Process Steps Technology in China
China is the earliest country in the world to study and apply continuous casting technology.
Since the 1950s, the research on continuous casting process steps technology has begun, and in the early 1960s, it has entered the stage of industrial application of continuous casting technology. However, from the late 1960s to the late 1970s, continuous casting technology almost stagnated.
Statistics in 1982 show that the average continuous casting ratio in the world is about 30%, while that in my country is only 6.2%.
After the 1980s, China's continuous casting technology entered a new period of development, and a number of advanced billet, slab and horizontal continuous casting machines were introduced from abroad.
In the mid-1980s, China had its first fully continuous casting plant, the No. 2 Steelmaking Plant of WISCO.
In recent years, China's continuous casting technology has developed rapidly. By 2005, all provinces (cities and autonomous regions) except Hainan, Ningxia and Tibet had continuous casting production, and the continuous casting ratio had reached 97.5%.
China is one of the earliest countries in the development of thin slab continuous casting technology, and has made major breakthroughs in the three core technologies of thin slab continuous casting mold, submerged nozzle and mold flux. Developed double arc, elliptical and cone Shaped inner cavity curved thin slab continuous casting mold, and used in industrial production.
4. Continuous Casting Technology Prospect
In terms of production capacity: With the industrialization of electromagnetic combined mold, non-sinusoidal vibration, light reduction, and solidification dynamic control technology, the output of slab continuous casting machine reaches 2 million tons/flow·year, and the output of billet continuous casting machine reaches 40 million tons. 10,000 tons/flow·year, forming a production process from a single casting machine to a single continuous rolling mill.
In terms of variety structure: With the application of electromagnetic technology and solidification control technology, continuous casting varieties will be expected to achieve 100% of the variety, and achieve organizational control, internal and surface quality control, and achieve high-efficiency production of defect-free billets.
In electromagnetic continuous casting: With the development of superconducting technology, the industrialization of electromagnetic confinement molds and electromagnetic shock devices for casting steel will become possible. Continuous casting machines in any combination.
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