The importance of continuous casting molten steel temperature control
Qualified molten steel temperature is one of the most important process parameters for the stability of continuous casting process and the acquisition of qualified ingots. Therefore, the molten steel temperature is the main criterion for whether casting can be carried out.
The temperature requirements for continuous casting molten steel are as follows:
- The tapping temperature of continuous casting molten steel is required to be 20-50℃ higher than that of mold casting. The reason is that the casting time is longer than that of mold casting; the additional heat loss of the tundish increases; the nozzle diameter is small.
- The stable fluctuation range of pouring temperature should be small. Low temperature is not conducive to the floating of inclusions, and it will also cause the nozzle to freeze, forcing the pouring to be interrupted and reducing the productivity of the continuous casting machine; high temperature forces the ingot to produce defects such as cracks and center segregation, and also makes the thickness of the crystallizer shell uneven, and in severe cases, it causes leakage.
Reduce the temperature drop of molten steel during transfer
In the temperature drop during the pouring process, the tapping temperature drop and the tundish temperature drop are the largest, and the fluctuation is relatively large. Therefore, the key to reducing the temperature drop during the pouring process is to reduce the temperature drop during the steel tapping process and the temperature drop of the tundish
- Steel tapping with hot ladle
- Shorten the waiting time before steel tapping with ladle
- Adding a covering agent to the steel molten surface of the ladle
- Adding an insulation layer and a cover to the ladle
- Accelerating the turnover of the ladle
- Reducing the heat loss of the tundish
