The furnace lining works in the furnace. 

First, a brittle decarburization reaction occurs on the surface, and a “reaction layer” is formed on the surface. 

The carbon in the reaction layer has been oxidized, and Fe2O3 and SiO2 in the slag invade the brick to form a low melting point substance with MgO and CaO. 

The more intrusive Fe2O3 and SiO2, the more the fire resistance and high temperature strength of the furnace lining bricks are degraded, even in the state of steelmaking, it becomes the state of the melting contact membrane, and the mechanical scouring of steel slag and furnace gas cannot be withdrawn, so that the brick and furnace lining will be Crisp down.