Application of High-Efficiency Continuous Casting Intermediate Vessel Refractory Materials (Part 3)
2025-07-24
3 Intermediate Vessel Protection Plate Application
The intermediate vessel uses magnesia dry materials, but after 20 hours, due to the high pulling speed and high-speed steel water scouring, the strength of the magnesia dry materials decreases, accompanied by poor erosion resistance. The intermediate vessel working lining operates at high temperatures, withstanding high temperatures while also withstanding the high-speed impact of steel water flow on the working lining material, which requires the refractory material to have strong scouring and erosion resistance. The package wall refractory material uses magnesia dry material vibration knotting, its structure is loose, it does not need to be sintered before use, only relying on the residual carbon carbon chain bonding formed by resin solidification, and the residual carbon volatilizes at high temperatures, which makes the anti-scouring and erosion resistance of the dry material poor.
3.1 Impact Zone Protection Plate Application
The intermediate vessel impact zone is directly scoured by the steel water: the steel water flow in this area is relatively active. To improve the erosion resistance and scouring resistance of the impact zone, an impact zone guard plate is designed and installed. The physical and chemical indicators of the guard plate are listed in Table 1. The "inner inlay" type guard plate installation is adopted to reduce the consumption of dry materials. The dry material laying height in the lower part of the intermediate vessel impact zone is 550 mm (550 mm from the package edge). The guard plate is placed in the gap between the tire mold and the permanent layer; ensuring a 10 mm gap between the guard plate and the permanent layer. The guard plate is arranged at the corner of the intermediate vessel, and then dry material is poured in to fix the guard plate.
Project | Index | |
| Chemical Composition % | AL2O3 | ≥85 |
| Bulk Density/(g'cm) | ≥2.95 | |
| 110 ℃x24 h | Flexural Strength/MPa | ≥9 |
| Compressive Strength/MPa | ≥70 | |
| Flexural Strength/MPa | ≥10 | |
| 1500 ℃x3 h | Compressive Strength/MPa | ≥74 |
| Linear Change Rate/% | 0.5 | |
3.2 Steel Facing Protection Plate Application
When the molten steel enters the flow stabilizer and then scours around, the package wall on the opposite side of the impact zone is continuously scoured by the molten steel, and the scouring resistance of the dry material is weaker than that of the flow stabilizer, so the erosion rate of the package wall opposite to the impact zone is faster. After the intermediate vessel is stopped, it is often found that the erosion rate of the slag line at the steel facing surface is faster than that of other parts. Therefore, the steel facing guard plate, adding an impact plate during the knotting process, can effectively improve the scouring resistance of this side and improve the service life of the steel facing working layer. At the same time, adding a magnesium-aluminum guard plate to the steel facing surface, filling the gap between the guard plate and the large working layer with a mixture of green mud and dry material to improve the service life of the intermediate vessel.
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2025-07-25
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