Maintaining plug bricks is very important for prolonging their service life and ensuring the stability of steel production process. The following are some effective maintenance methods and daily maintenance measures:

I. Daily cleaning and inspection

Cleaning dust and foreign matter: use brush, sandpaper or burlap to clean the dust and foreign matter on the surface of plug brick to ensure its surface is clean and reduce the risk of corrosion.

Check the wear and tear: check the wear and erosion of plug bricks regularly, and find and replace the seriously worn bricks in time.

II. Waterproof treatment

Waterproofing agent spraying: If the plug brick has been soaked in water, the caulking agent may crack. Waterproofing agent can be sprayed at this time to enhance the waterproof effect.

Hydrophobic coating: When there is water on the wall, you can use a brush to coat hydrophobic agent on the gap for construction.

III. Optimize materials and design

Selection of suitable materials: For high-temperature environment, it is recommended to use high-alumina plug bricks, zircon bricks or silicon carbide-based plug bricks, which have better wear resistance and erosion resistance.

Optimization design: by improving the shape and matching mode of plug brick, for example, changing the plug head from parabolic shape to spherical shape, its corrosion resistance and service life can be improved.

IV. Construction and installation

Ensure sealing: when installing the plug brick, ensure that it is in close contact with the nozzle brick, and no gap can be generated due to deformation or local corrosion.

Use waterproof materials: When laying plug bricks, the top bricks and bottom bricks need to be properly treated with waterproof materials to prevent moisture infiltration.

V. Regular maintenance and repair

Repair damaged parts: For the damaged plug bricks, fire-resistant paint spraying can be used for gunning to prolong their service life.

Optimization of tundish structure: By optimizing the structural design of tundish, the erosion of plug bricks can be reduced and its service life can be improved.

VI. Process optimization

Control the temperature of molten steel: during pouring, control the temperature and composition of molten steel to avoid excessive erosion of plug bricks.

Reduce temperature change: avoid the plug brick from experiencing severe temperature change during use, so as to reduce thermal shock damage.

Through the above maintenance methods and daily maintenance measures, the service life of plug bricks can be significantly prolonged and the efficiency and stability of steel production can be improved.