Introduction
The center of continuous casting billet is a key process in the steelmaking process. In the loosely connected center of continuous casting billet, there are many physical and chemical changes happening at the same time and space, which will limit the movement of molten steel and affect the quality of continuous casting billets. The quality of the center of the continuous casting billet has a direct impact on the size accuracy, surface quality and overall mechanical properties of the final product. In addition, the production efficiency of the center of the continuous casting billet is also affected by the uncompleted structure.
Reasons of the Slack Connectivity
There are a lot of factors that can affect the loose connection of the center of the continuous casting billet. The steel composition, the oxygen content of the metal, the heat exchange rate and the thermal condition are some of the major factors that play a role. The most important factor, however, is the conditions of the molten steel. In most cases, the lower the oxygen content of the metal, the less tightly connected the center of the continuous casting billet is. This is mainly due to the higher temperature of the metal, which results in the metal being more active and therefore the molecules of the metal can more easily escape.
Methods to Increase Connectivity
1. Adjustment of the Alloy Composition of the Molten Steel
The alloy composition of the molten steel can be adjusted to improve the connectivity of the center of the continuous casting billet. Generally, adding a certain amount of Mn, Si or other alloy elements can effectively reduce the oxygen content of the molten steel and reduce the temperature of the metal, thereby improving the connectivity of the center of the continuous casting billet.
2. Adjustment of the Casting Parameters
The casting parameters, such as the casting speed, the tundish level, the feeding rate and the liquid head, can also be adjusted to improve the connectivity of the center of the continuous casting billet. For instance, a lower casting speed and a higher tundish level can reduce the turbulence of the molten steel and help weaken the oxygen content and reduce the temperature of the molten steel. Similarly, the feeding rate of the molten steel can also be adjusted to improve the connectivity of the center of the continuous casting billet.
3. Control of the Casting Conditions
The caster can also control the casting conditions to improve the connectivity of the center of the continuous casting billet. For example, the caster can reduce the oxygen content of the molten steel by controlling the cleanliness and temperature of the tundish, the preheating of the mold, the immersion depth of the tundish tube and the casting temperature. The oxygen content, thermal condition and liquid head inside the mold should also be strictly controlled in order to obtain a tight connection at the center of the continuous casting billet.
Conclusion
The loose connection of the center of the continuous casting billet can significantly affect the quality and production efficiency of the steel products. Therefore, it is important to take some necessary measures to improve the connectivity of the center of the continuous casting billet. Adjusting the alloy composition of the molten steel, adjusting the casting parameters and controlling the casting conditions are effective methods to improve the connectivity of the center or the continuous casting billet. With these measures, the quality and production efficiency of the steel products can be improved.
