After the molten steel produced by the converter is refined in the refining furnace, the molten steel needs to be cast into billets of different types and specifications. The continuous casting section is the production process of continuously casting the refined molten steel into steel billets. The main equipment includes a turntable, a tundish, a mold, and a tension leveler.
The non-sinusoidal vibration technology of the mold has significant effects in improving the drawing speed, improving the surface quality of the casting slab, and reducing the leakage rate. This technology can not only increase the drawing speed of the continuous caster, increase the productivity, reduce the leakage of the continuous caster, and stabilize the production of the continuous caster, but also can provide high-quality cast slabs for rolling and improve the quality of the rolled material.
The ladle containing refined molten steel is transported to the turntable. After the turntable rotates to the pouring position, the molten steel is injected into the tundish, and the tundish distributes the molten steel to each mold through the nozzle. The mold is one of the core equipment of the continuous casting machine, which makes the casting shape and rapidly solidify and crystallize. The tension leveler and the crystal vibration device work together to pull out the castings in the crystallizer, and cut them into slabs of a certain length after cooling and electromagnetic stirring.
Continuous casting automation control mainly includes continuous casting machine drawing roll speed control, mold vibration
Control technologies such as dynamic frequency control and fixed-length cutting control. Continuous casting and rolling requires the continuous casting machine to be able to produce high-temperature billets, and the cast billets have high surface quality and internal quality. At the same time, the continuous casting machine is required to have stable and high productivity and high drawing speed to meet the needs of high-speed rolling. Mold non-sinusoidal vibration technology is the key technology of continuous casting and rolling.
According to the different steel rolling process, the continuous casting and rolling mill is known for its high configuration efficiency and low energy consumption.
1. After the scrap steel is smelted, it is transferred through the ladle, and the temperature of the molten steel is determined according to the lifting distance and the temperature in the workshop. Avoid excessively rapid temperature drop of molten steel, which may cause stacking and sticking when poured into the continuous caster, resulting in slow flow of molten steel, which will seriously affect production capacity.
2. The outside temperature is low, the temperature of molten steel drops quickly, and it decreases as the temperature continues to be cold. In order to solve this problem, a heat-preserving ladle can be used to maintain the temperature of the molten steel to ensure that the molten steel does not become viscous when entering the continuous casting machine.
3. It is difficult for the continuous casting machine to continuously cast the billet, and the temperature can be raised by blowing oxygen from the outside. Therefore, the continuous casting machine must meet the requirement of "continuous casting first, oxygen blowing later". At the same time, cooling water is used to spray the billet to cool down, and enter the rough rolling mill after being cut.
The above introduced some improvement schemes on the synergy between continuous casting and rolling mill smelting and continuous casting, and it is believed that the effect of continuous casting and rolling mill will be greatly improved.
Post time: Apr-13-2021