The quality of refractories has a direct impact on the life of the furnace, the quality of the product, the cost of the product, etc. The quality of the refractories depends on the physical properties of the refractories. According to the above problems, we must choose A new type of refractory material that withstands high temperatures and withstands high pressure at the same time. For this reason, it was studied together with the refractories manufacturers, and the physical properties and working performance of various refractories were analyzed and compared. Finally, mullite refractory materials were selected to make T-83 trust bricks. Mullite is an orthorhombic system with high mechanical strength and stiffness and low expansion coefficient. The mullite refractory material is divided into two types: sintered mullite and fused mullite, and it is decided by the manufacturer to select the sintering method. Mullite is a T-83 brick. The physical and mechanical properties of sintered mullite bricks and clay bricks are compared.

From the above comparison, the indicators of the mullite bricks are better than the clay bricks, especially the high temperature compressive strength is several times that of the clay bricks. The size of the trust bricks has also been changed accordingly and formulated with the manufacturer. The mullite crib brick processing technology requirements. How to insulate the longitudinal pipes on the custody brick in the preheating section is a new topic, and it is also an innovation in the heating process. At present, most of the rolling mills in the country are not insulated in the preheating section. There are two reasons for this: First, because this part of the vertical pipe is laid on the custody brick, it is not suitable for thermal insulation, and there is no domestic capable of producing such cribs; the second is the influence of the original steel heating process. Because the original heating process in order to reduce the oxidation loss of steel are used, "low steel temperature, slow heating, high steel temperature, fast heating.

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