What are the reasons for the damage of ladle breathable bricks?

In the process of using ladle breathable bricks by iron and steel manufacturers, the main reasons for the damage of breathable bricks are thermal stress, mechanical stress, mechanical wear, and chemical corrosion. The breathable brick includes two parts: breathable core and breathable seat brick. In the case of open bottom blowing gas, the working surface of the breathable core will be in direct contact with the high temperature molten steel. The bottom blowing gas is a cold air flow, which forms a very high temperature difference with the high temperature molten steel. The rapid cooling and rapid heating, the deeper the corrosion of the breathable brick core is, and it is easy to produce cracks.

The working surface of the bottom-clad breathable brick is in direct contact with the high-temperature molten steel, and the temperature of the non-working surface is relatively low. During the cycle of steel connection, pouring, and hot repair of the ladle, the volume of the breathable brick and the adjacent refractory material is caused by the change of temperature. The volume change, due to the existence of the temperature gradient and the different thermal expansion coefficients of the metamorphic layer and the original layer, the degree of volume change in the process from the working surface of the air-permeable brick to the non-working surface is abrupt, which will cause shearing of the air-permeable brick. The shear force will cause cracks in the horizontal direction of the breathable brick, and in severe cases, the breathable brick will be cracked horizontally.

During the tapping process, the molten steel will have a high-strength scour on the bottom of the ladle, which will speed up the corrosion of the breathable brick. The bottom part is generally washed away after one use. In addition, after the purification is completed, if the valve is quickly closed, the reverse impact of the molten steel will also accelerate the erosion of the breathable brick.

The working surface of the breathable brick core is in contact with steel slag and molten steel for a long time. The steel slag and molten steel contain iron oxide, ferrous oxide, manganese oxide, magnesium oxide, silicon oxide, etc., while the composition of the breathable brick is alumina, silicon oxide, etc. , it will react to generate low melt and be washed away.

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