News
2025/ 05 / 08
Solve the problem of high shell temperature of single-stream slab continuous casting tundish
The single-stream slab continuous casting tundish is mainly composed of steel shell, insulation layer, permanent layer, working layer, etc. During the continuous casting production and use, the cladding temperature is an important application indicator for evaluating whether the tundish can continue to be used. Therefore, it is very important to pay attention to the change of cladding temperature.
The single-stream slab continuous casting tundish is the most common and widely used tundish type in the field of slab tundishes in China. It belongs to a rectangular tundish. Its internal structure is characterized by: a prefabricated slag retaining wall is installed inside, and the slag retaining wall divides its internal structure into two parts: impact zone and non-impact zone. During the casting process, the impact zone is continuously impacted and eroded by the molten steel in the ladle casing. The cladding temperature of the impact zone is the key focus. If the temperature of this part changes too high and too fast, the tundish is in danger of being forced to go offline, resulting in abnormal offline, which in turn affects the normal production and operation of the continuous casting machine.
Take a steel plant as an example. The annual output value of the slab production line is about 1 million tons. It belongs to the single-stream slab continuous casting tundish, and the use time is required to be 24 hours. In recent production, the cladding temperature is frequently too high, which affects the continuity of continuous casting production operations and is forced to go offline. Therefore, it is necessary to take measures to solve such problems.
There are many reasons for the high cladding temperature of the rectangular tundish. The main factors include steel shell thickness, anchor hook design, insulation layer material design, permanent layer castable material selection, and working layer thickness.
In order to solve the above-mentioned high cladding temperature problem, Beijing United Technology experts proposed a series of improvement measures, the main measures are:
First, improve the material of the permanent layer castable: by adjusting the particle ratio of the castable and adding high-quality and efficient dispersant, improve the fluidity and water addition of the castable operation. At the same time, select granular aggregates with low body density and high strength to improve the overall thermal conductivity of the castable.
2. During on-site construction: For the key special parts of the cladding, such as the slag line in the impact zone, when constructing the new permanent layer, it is necessary to appropriately thicken it, with a thickness range of 2-3 cm.
3. Adjust the material of the dry material of the working layer: During the casting and use of the tundish, if the slag line of the working layer penetrates and erodes quickly, the temperature of the cladding will rise sharply in a short period of time. In severe cases, the cladding will turn red, and there is a risk of piercing the cladding and steel. For this reason, in terms of adjusting the material of the dry material, select sintered or large-crystal magnesia with strong corrosion resistance and penetration resistance, high grade, and high quality as raw materials, and improve the overall corrosion resistance and penetration resistance of the working layer by adjusting the fine particle ratio.
4. Correctly select the insulation board: Select the nano-aluminum foil reflective insulation board with low body density, high flexural strength, and low thermal conductivity. When installing on site, for special parts, such as the slag line in the impact zone, it should be appropriately thickened, with a thickness range of 0.5-1 cm. At the same time, when installing the insulation board, as many heat dissipation holes as possible should be reserved between the insulation boards to ensure that the water vapor is fully removed during the baking process of the permanent layer castable.
The fifth is to adjust the length, bifurcation angle, and arrangement of the anchor hook. The function of the anchor hook is to reinforce the overall structural strength of the permanent layer castable, so its length must be standardized. Too long or too short will affect the stability of its overall structure. The bifurcation angle is unified at 120° to increase the contact area with the permanent layer castable. At the same time, the anchor hooks are uniformly arranged horizontally.
After adopting the main cooling measures, after on-site verification and continuous use observation, the shell temperature dropped from the original 380℃ to 310℃ after 24 hours of casting, and the temperature was significantly reduced, and the overall use was good. At the same time, it is also conducive to improving the service life of the entire tundish and has broad market application prospects.
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