Low porosity clay brick can maintain high strength in steelmaking furnace, mainly due to its unique physical and chemical characteristics, the following are specific reasons:

I. Low porosity and high compactness

The porosity of clay bricks with low porosity is usually lower than 17% or even lower. This low porosity structure makes the brick more compact, reduces the penetration of high-temperature gas and molten substances, and thus effectively improves the corrosion resistance and mechanical strength of the brick.

II. High load softening temperature

The load softening temperature of clay brick with low porosity is high, usually between 1470 and 1550 C. This feature enables it to maintain its shape and performance in the high temperature environment of steelmaking furnace, and will not be deformed or softened due to high temperature, thus ensuring the stability of furnace lining.

III. High cold compressive strength

The cold compressive strength of clay bricks with low porosity is usually between 58.8 MPa and 80 MPa, or even higher. This high strength enables the brick to withstand the mechanical stress in the steelmaking furnace, including the pressure of molten iron and slag.

IV. Good erosion resistance

Low porosity clay brick has strong tolerance to acidic, alkaline or neutral slag and chemicals. In the steelmaking furnace, the erosion of molten iron and slag is one of the main reasons for the damage of refractories. The dense structure of low porosity clay brick can effectively prevent the penetration of slag, thus prolonging the service life.

V. Thermal shock stability

Low porosity clay brick shows good stability under high temperature and thermal shock. The internal micropore structure can effectively prevent the crack from spreading, and even if cracks occur under thermal shock, it will not lead to the overall fracture of the brick. This feature enables the brick to maintain its structural integrity in frequent temperature changes, further improving its service life in the steelmaking furnace.

VI. Volume stability at high temperature

Clay bricks with low porosity have good volume stability at high temperature, and will not expand or shrink significantly due to temperature changes. This stability is very important for the lining of steelmaking furnace because it can reduce the structural damage caused by thermal expansion.

VII. Wear resistance

Low porosity clay brick has good wear resistance, which can resist the erosion of molten iron and slag in steelmaking furnace and reduce the damage caused by mechanical wear.

VIII. Summary

Low porosity clay brick can effectively maintain high strength and stability in steelmaking furnace through its characteristics of low porosity, high compactness, high load softening temperature, high cold compressive strength, good corrosion resistance and thermal shock stability. These characteristics make it an ideal material for lining of steelmaking furnace, which can significantly improve the service life and reliability of lining.