The role of continuous casting flux in casting
Release time:
2022-02-15
The true meaning of casting is not merely the formation of a certain thickness of liquid tundish slag layer on the top of the molten steel in the mold, isolating the molten metal from atmospheric erosion. After completing this task, a certain thickness of protective slag layer is wrapped on the surface of the billet. On the slag interface in the mold, a mold shell of non-metallic material is first formed, and then the liquid metal adheres to the inner cavity of the mold shell to form a nascent metal mold shell, which gradually develops and increases its thickness, away from the mold copper tube, forming a mold shell with sufficient safety thickness, so that the internal molten steel, figuratively speaking, is wearing a tight-fitting garment on the outer wall of the mold shell. This solid and molten mold shell is equivalent to separating the high-temperature mold shell and the copper tube, playing the following role. Let's learn more about it below. Continuous Casting Protective Slag Its role in casting.
1. Continuous casting protective slag improves friction: The frictional contact between the metal shell and the inner surface of the copper tube is changed to the frictional contact between the slag composed of non-metallic protective slag and the copper tube. This is a stable frictional contact relationship, which greatly reduces the wear of the copper tube and greatly improves the service life of the copper tube.
2. Continuous casting protective slag reduces the fluctuation of molten steel: From the perspective of open casting, the fluctuation of the molten steel surface is very large, but due to the use of protective casting, the slag has a certain thickness, so this self-weight acts on the molten steel surface, greatly reducing the fluctuation of the molten steel on the entire molten steel surface. Of course, due to the great effect of the immersion nozzle insertion depth, a stable soup surface will be formed. Therefore, the vibration marks formed on the protective slag are regular.
3. Continuous casting protective slag changes the heat transfer mode and efficiency of castings: The slag shell formed by the slag is closely combined with the surface of the metal shell, creating conditions for the stable heat transfer of the entire shell, which is conducive to the uniform generation and development of the shell.
4. Continuous casting protective slag is conducive to air gap filling: The matrix shrinks during the transition from liquid to solid, and the matrix locally dents, forming air gaps. The molten tundish slag is pressed into the air gaps under the action of the regular pulling of the tundish, filling the air gaps and maintaining the continuous and stable heat transfer of the tundish slag layer;
5. Continuous casting protective slag obtains good surface quality: It is precisely because of the uniform protective slag shell that wraps the surface of the metal shell, obtaining good and uniform heat transfer, and the contact between the solid metal shell and the copper tube causes bonding defects, the surface quality of protective casting is much better than that of open casting;
6. Continuous casting protective slag reduces the superheat during shell formation: There is liquid protective slag on the upper layer of the tundish slag interface. First, the protective slag shell is formed. The initial metal shell adheres to the non-metallic protective slag shell to form. The process of metal initial solidification is not as violent as open casting, but the molten steel and the non-metallic protective slag shell contact. At this time, the temperature of the protective slag shell forming the glass body crystal is much higher than the temperature of the inner wall of the copper tube, thus obtaining a more balanced and stable condition for the formation and growth of the initial shell, resulting in uniform and growth.
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