Off-furnace refining technology
The refining process is to optimize the quality of molten steel by degassing, deoxidation, desulphurization, removal of inclusions, fine-tuning of alloy composition and precision of temperature. Through secondary refining process, the quality of molten steel can be improved and the special requirements of different steel grades can be met. Therefore, refining is a core part of the construction and production sequence of modern steel mills.
Refining is a necessary means for steel mills to develop new varieties, enhance market competitiveness, and a buffer for production rhythm. It plays an irreplaceable role in the control of production rhythm and the guarantee of product quality.
The refining process configuration is divided into three categories: LF furnace process, CAS process, RH process.
At present, the refining process is mainly divided into the following four categories:
1) LF refining process: For low-oxygen and low-sulfur steel, such as low-alloy steel and low-grade pipeline steel, it needs to be processed by LF ladle refining furnace and sent to continuous casting machine.
2) RH refining process: For low carbon steel, ultra-low carbon steel and steel with high gas content control requirements, it is necessary to be sent to continuous casting after RH treatment.
3) LF+RH dual treatment process: For some steel with special quality requirements, such as high grade pipeline steel and high strength steel, it is necessary to be double treated by LF ladle furnace and RH vacuum degassing device.
4) CAS refining process: as a parallel or alternative process route for LF refining, CAS can complete most of the functions of LF in addition to desulfurization.
Slab continuous casting technology
The ladle containing the refined molten steel is transported to the rotary table, and after the rotary table is turned to the pouring position, the molten steel is injected into the tundish, and the tundish is then distributed to the various crystallizers by the water outlet. The mold is one of the core equipment of the continuous casting machine, which makes the slab form and solidify and crystallize quickly. The pull straightening machine and the crystallization vibration device work together to pull out the slab in the mold, cool it by the fan section, and cut the slab into a certain length by the flame.
Continuous casting is the process of turning high temperature liquid steel into solid slab.
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