Ramming material manufacturers tell you the influence of sliding nozzle refractories on breakout

ramming materialThe manufacturer tells you the influence of sliding nozzle refractories on breakout:

The refractory part of the sliding nozzle is the core part of the sliding nozzle, and it is the key component that directly contacts and controls the molten steel. Its physical and chemical properties are the key factors that determine whether the sliding nozzle can be used normally.

A. The high temperature strength of the nozzle block brick is low. When using the air pick to heat-exchange the ladle on the nozzle block, the air pick often breaks the block block, which expands the diameter of the block block, and the gap between the block block and the nozzle block is large. When the molten steel is poured , The molten steel forms an eddy current at the seat brick part, and is affected by the scouring effect of the molten steel, the molten steel is easy to enter the gap, and there is a steel leakage accident around the brick at the upper nozzle.

B. The thermal stability of the ladle nozzle brick is poor. During the use of the nozzle brick, with the turnover of the ladle, the temperature between the pouring steel and the empty ladle hot repair is quite different. Affected by the rapid cooling and rapid heating, it is easy to burst during use. If the phenomenon cannot be found in time, molten steel seeps out from the mud joint between the upper nozzle brick and the seat brick through the blasting seam of the upper nozzle brick.

C. Skateboard bricks are not resistant to corrosion and scouring of molten steel. When the sliding nozzle is half-flow poured, the lower slideboard bricks are strongly scoured by molten steel due to the interception of molten steel. In the long-term effect, grooves will be formed on the slide board bricks. When the molten steel condenses in the groove when the flow is closed and the ladle is closed, the steel is clamped between the two sliding plates, the sliding nozzle cannot be opened and closed, and the injection run is out of control.

D. The sprue brick bursts when it is in use. When the sluice brick is under the influence of thermal stress, transverse cracks will appear. Under the effect of the molten steel pressure, the cracks gradually expand into cracks, and the molten steel seeps out of them. In severe cases, the lower part of the cracks The refractory ceramic fiber board is broken by its own gravity and the pressure of molten steel.

E. The refractory mud is not resistant to the corrosion and scouring of molten steel, which leads to steel infiltration or steel formation in the joint during use. If it is found that there will be steel leakage between the upper nozzle brick and the seat brick and between the upper nozzle brick and the upper sliding plate brick .

The above is the introduction of the influence of sliding nozzle refractory on breakout