What are the requirements for continuous casting protective slag melting patterns?
Release time:
2020-07-27
To achieve high-quality and efficient continuous casting production, and even hot charging of defect-free steel billets, the correct selection and use of continuous casting flux is essential. But the most fundamental issue is that we must first understand continuous casting flux its function and how to ensure the flux functions normally under complex and variable continuous casting process conditions.
To fulfill the flux its five major functions, the flux a specific melting method is required, namely, forming a so-called three-layer structure of powder slag layer, - sintered layer - and liquid slag layer on the surface of the molten steel.
Low melting point ( 1500 powder is added to the surface of the high-temperature molten steel (approximately 1100 ~ 1200 ) in the crystallizer. Heat from the molten steel causes the powder to form a slag layer of a certain thickness (approximately the flux 10 ~ 15 mm ). Heat transfer from the molten steel to the slag layer slows down, and the powder on the slag layer is heated, the flux and the flux the powder is sintered together to form the so-called sintered layer (temperature between the two). On the sintered layer, the powder slag absorbs less heat from the molten steel, and its temperature is lower (below 500 ), so it remains powdery and evenly covers the surface of the molten steel, preventing heat dissipation and preventing oxygen in the air from entering the molten steel.
During the casting process, due to the up and down vibration of the crystallizer and the downward movement of the solidified shell, the liquid slag layer on the steel surface is continuously squeezed between the shell and the copper wall through the interface between the molten steel and the copper wall, forming a solid slag film on the copper wall surface and a liquid slag film on the surface of the solidified shell. At the same time, continuous casting flux the film fills the air gap between the shell and the copper wall, reducing thermal resistance and improving crystallization heat transfer.
During the pulling process, the liquid slag on the steel surface is continuously consumed, while the sintered layer falls onto the steel surface and melts into a liquid slag layer, and the powder the flux layer becomes the sintered layer. Then, new the flux powder is added to the crystallizer to maintain the three-layer structure, thus continuously consuming the protective slag powder.
For more questions, please consult Luoyang Turner High Temperature Instrument Co., Ltd., a professional manufacturer of high-temperature laboratory equipment and reagents.
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