Improving the cleanliness of the cast slab is the basis for the production of high-quality steel, and the total oxygen content of the cast slab is an important measure of the cleanliness of the molten steel. Reducing the total oxygen content of the cast slab is mainly carried out from three aspects: converter process, refining process and continuous casting process:
1, converter process
The converter process should implement high carbon pull rate and optimize the slag washing process.
(1) End pull carbon
Implement a less slag process, which strengthens the dephosphorization effect in the early stage, stabilizes the decarburization operation in the later stage, and then implements high-carbon control.
(2) Slag washing process
Promote the converter lime slag washing process, that is, during the converter tapping process, after the alloy is added, lime is directly added from the silo to the ladle along with the molten steel flow. This helps lime pre-melting in advance, promotes the slag to absorb inclusions for more time, and the initial slag can effectively cover the molten steel interface, reducing the probability of exposed molten steel to absorb oxygen.
2, refining process
The refining process should optimize the slag system, bottom argon blowing process, and calcium treatment process.
(1) Slag system optimization
The increase in the basicity of the slag is conducive to improving the deoxidizing capacity of the refining slag and reducing the oxygen content in the steel. At the same time, the slag should be reduced. This is because the SiO2 content in the slag is reduced, which greatly reduces the SiO2 activity coefficient, which can avoid or reduce the influence of the reaction between SiO2 in the slag and Al in the steel on the deoxidation of molten steel.
(2) Optimize the bottom blowing argon process
is mainly: (1) The entire refining process should use as little strong stirring as possible to reduce the exposure of molten steel and slag entrapment, and reduce the erosion of the ladle refractory material. (2) During the soft blowing process, pay attention to adjusting the argon gas so that the slag creeps, and the molten steel level is not exposed. (3) Before the VD reaches high vacuum, avoid excessive argon flow to expose molten steel; when reaching high vacuum, adjust the argon flow appropriately to ensure sufficient vacuum degassing effect and increase the reaction rate of slag steel.
(3) Calcium treatment process
Solid core pure calcium wire has obvious effect on Al2O3 inclusion denaturation. The calcium treatment process uses solid core pure calcium wire instead of silicon calcium and calcium iron cored wire.
3, continuous casting process
The continuous casting process mainly protects the pouring: argon replacement is used before pouring, and asbestos bowl gaskets are used for the large package casing to avoid secondary oxidation caused by oxygen absorption in the molten steel; the addition of the covering agent for the tundish must meet the requirements to ensure that the molten steel is not exposed and the slag layer No crusting; strengthen the monitoring and maintenance of the automatic monitoring system for slag under the ladle to ensure the normal operation of the system; ensure that the drainage sand is added to increase the self-opening rate of the pouring slide.
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