The reheating furnace is a thermal equipment used for heating billets or small ingots during rolling, and the operating temperature is generally from 1300 to 1400 °C. This type of furnace is generally made of clay bricks, and the heating section and the soaking section are also made of three-class high aluminum bricks.The damage of lining is mainly caused by high temperature, thermal stress, air scour and mechanical collision. The lower part of the furnace wall in the high temperature section, the bottom of the furnace and the water-cooled tube wrapping layer are also eroded by the molten iron oxide slag. Therefore, masonry magnesia brick or paving magnesia is the protective layer, and the water pipe wrapping layer uses high alumina refractories.

With the large-scale and high-efficiency of the rolling mill, higher requirements for reheating furnace are put forward,and Its development trend is large, low-cost, pollution-free and operational automation, so the masonry materials have also experienced great changes. Since the 1970s, unshaped refractories have been used widely. In the late 1980s, the gas-fired heating furnace used crystalline alumina fiber or aluminum silicate fiber as the working layer, which achieved remarkable energy-saving effects and became the future development direction.