In the modern steel manufacturing process, refractory plug brick, as a key refractory product, plays a vital role. It not only ensures the smooth casting process, but also directly affects the quality and production efficiency of molten steel. This paper will introduce the characteristics, application, technical parameters and its important position in iron and steel industry in detail.

I. Definition and function of plug brick

Stopper head brick is the core refractory used to control the flow of molten steel. It is located at the bottom of the Stopper rod, closely matched with the Nozzle brick, and can open and close the molten steel pouring by moving up and down. In the process of casting steel, the contact parts between the plug brick and the nozzle brick need to maintain good sealing to prevent molten steel from leaking and ensure the stability and safety of the casting process.

II. Material Characteristics of Plug Brick

Plug bricks are usually made of high-alumina refractory (40%-75% Al₂O₃ content), which has the following remarkable characteristics:

High fire resistance: it can remain stable in high temperature environment without melting or softening, ensuring long-term use in the process of casting steel.

Good thermal shock resistance: able to withstand the rapid change of temperature and reduce the risk of cracking caused by thermal stress.

Excellent wear resistance and crack resistance: under the scouring of high-temperature molten steel and slag, the plug brick can maintain the integrity of shape and structure and prolong its service life.

Good corrosion resistance: it can resist the chemical erosion of molten steel and slag and prevent the rapid loss of materials.

No pollution to molten steel: the material composition is pure, and impurities will not be introduced into molten steel to ensure the purity of molten steel.

III. Structure and Design of Plug Brick

The design of plug brick takes into account its complex working conditions in the process of casting steel. Its top is usually cylindrical or conical, so as to be closely connected with the stopper and transmit the operating force; The bottom is shaped to match the nozzle brick to ensure good sealing. The size and shape of plug brick can be customized according to the specific needs of customers to adapt to different specifications of ladle and nozzle brick.

IV. Application Scenario of Plug Brick

Plug bricks are widely used in continuous casting and die casting process in iron and steel industry. In the process of continuous casting, the plug brick realizes stable continuous casting by accurately controlling the flow and velocity of molten steel; In the process of die casting, the plug brick is used to control the intermittent pouring of molten steel and ensure the quality and dimensional accuracy of ingot. In addition, plug bricks can also be used in the production of special steel and alloy steel to meet the strict requirements of different steel grades on refractories.

V. Technical parameters and quality control

The technical parameters of plug brick include chemical composition, physical properties and dimensional accuracy. In terms of chemical composition, Al₂O₃ content is a key index, usually between 40% and 75%, to ensure the fire resistance and corrosion resistance of materials. In terms of physical properties, plug bricks need to have high density, low porosity and high strength to resist the erosion and erosion of high-temperature molten steel. In terms of dimensional accuracy, the dimensional tolerance of the plug brick is strictly controlled within a very small range to ensure a close fit with the nozzle brick.

In order to ensure the quality of plug bricks, production enterprises usually establish a strict quality control system. From the procurement of raw materials to the delivery of finished products, every process has undergone strict quality inspection. Chemical analysis, physical performance test, appearance inspection and other testing items run through the whole production process to ensure that each plug brick meets high quality requirements.

VI. Customized service for plug bricks

With the continuous development of iron and steel industry, higher requirements are put forward for the performance and specifications of plug bricks. In order to meet the individual needs of customers, plug brick manufacturers provide customized services. Customers can provide detailed size, chemical composition and technical specifications according to their own production process and equipment requirements, and production enterprises will make customized production according to these requirements. This customized service not only improves the applicability and service life of plug bricks, but also provides customers with more competitive product solutions.

VII. Conclusion

As an indispensable key component in iron and steel production, refractory plug brick plays an important role in cast steel process with its excellent fire resistance, thermal shock resistance, wear resistance and corrosion resistance. Through strict quality control and customized service, plug bricks can meet the diverse needs of different customers and provide a strong guarantee for the efficient and stable production of iron and steel industry. In the future, with the technical progress of steel industry and the improvement of environmental protection requirements, plug bricks will continue to be optimized and upgraded, contributing to the sustainable development of steel manufacturing.