The process of pouring liquid molten steel into a continuous casting machine, condensing and cutting, and directly obtaining the casting billet. Referred to as continuous casting. It is a process between steelmaking and rolling. The billet produced by continuous casting is the raw material for the production of various products in the hot rolling mill.
The steel billet continuous casting process is one of the most critical technologies in the development of the iron and steel industry in the 20th century, and its appearance has fundamentally changed the die-casting-blooming process that has dominated for a century. The development of steel billet continuous casting process technology has improved the mechanization and automation level of the steelmaking production process, which has greatly increased the steel production capacity and has become the main means for the steel industry to reduce production costs and improve competitiveness.
The ladle containing the refined molten steel is transported to the rotary table. After the rotary table is rotated to the pouring position, the molten steel is injected into the tundish, and the tundish distributes the molten steel to each mold from the nozzle. The mold is one of the core equipment of the continuous casting machine, which forms the casting and rapidly solidifies and crystallizes. The tension leveler and the crystallizing vibration device work together to pull out the castings in the mold, and after cooling and electromagnetic stirring, they are cut into slabs of a certain length.
The automatic control of continuous casting mainly includes control technologies such as the speed control of the continuous casting machine drawing roll, the control of the vibration frequency of the mold, and the fixed-length cutting control.
Since the 1980s, the optimized development of conventional continuous casting technology and the development and application of near-net shape continuous casting technology. The continuous casting ratio continues to rise, the casting machine operation rate, productivity, casting billet quality, billet drawing speed, and the number of continuous casting furnaces continues to increase, the casting varieties expand, and the production cost continues to reduce. The continuous casting process of cast steel completely replaces die casting.
The steel billet casting process has the following advantages:
The technological process of casting billet production is simplified, the investment in process infrastructure can be reduced by 40%, the floor space can be reduced by 30%, the operating cost can be reduced by 40%, and the consumption of refractory materials can be reduced by 15%; the metal yield can be increased by 8% to 14%. %; reduce energy consumption, and produce 1 ton of qualified casting billets, which can save energy consumption by 400-1200 MJ.