Tundish Impact Plate
2025-11-10
What is Tundish Impact Plates
Impact plates are used in the impact zone of molten steel in the continuous casting tundish. Precast components with different lifespans and materials can be designed according to different smelting requirements of users.
Tundish impact plates are anti-turbulence devices placed in the impact zone of the ladle's molten steel flow within the tundish. They limit the impact of the ladle's molten steel flow, reduce direct erosion of the ladle bottom, decrease molten steel splashing, reduce turbulent flow, prevent slag entrapment, improve the piston flow characteristics of the molten steel flow in the tundish, and reduce dead zones and short-circuit flows. The impact plate is the most critical area in the tundish; its service life determines the service life of the tundish. The impact plate is one of the key factors affecting the tundish's lifespan.
Installing impact plates in the continuous casting tundish prevents high-temperature molten steel from directly impacting the ladle bottom, effectively extending the service life of the tundish lining material. To meet the requirements of higher heat rates of continuous casting and molten steel cleanliness, we use magnesia impact plates.
Material Design of Magnesia Impact Plates:
(1) High room temperature strength for easy handling and installation;
(2) No cracking or peeling during baking and use;
(3) Strong resistance to molten steel erosion;
Based on the above conditions, the following technical measures were adopted:
(1) High-quality magnesia sand as the main raw material, which does not contaminate the steel;
(2) Silica powder as a binder to meet the strength requirements of temperature changes at each stage;
(3) High-temperature reinforcing agent added to improve the hot-state erosion resistance of the impact plate;
(4) Specific water-reducing agent added to reduce the amount of water added to the castable and improve the construction performance of the castable.
Application of Magnesia Tundish Impact Plates
Practice at a steel plant has proven that: Our magnesium tundish impact plates have increased the number of continuous furnace pours from the original 5-6 heats to the current 8-10 heats. The magnesium impact plates still maintain an intact overall structure, with only slight pitting in the molten steel impact zone, indicating that the magnesium impact plates have good resistance to molten steel erosion. The casting speed of the billet was increased from 1.0~1.2m/min to 1.3~1.6m/min. Large-scale use shows that the magnesium impact plate is easy to install, and no cracking or punching was found during use. It does not float during use. In terms of billet quality, the inclusion content is normal.
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