Castable is a mixture composed of refractory aggregate, powder and binder. After adding water or other liquids, it is suitable for construction by casting and vibrating methods. It can also be prefabricated into preforms with specified shapes and sizes for construction industry Furnace lining. In order to improve the physical and chemical properties and construction performance of refractory castables, an appropriate amount of additives are often added, such as plasticizers, dispersants, coagulants, retarders, swelling agents, degelling-gelling agents, etc. In addition, for refractory castables used for parts subject to large mechanical forces or strong thermal shocks, if an appropriate amount of stainless steel fiber is added, the toughness of the material will be significantly increased. In the heat-insulating refractory castable, if the inorganic fiber is added, it can not only enhance the toughness, but also help to improve its thermal insulation performance. Because the basic material composition of refractory castables (such as aggregates and powders, admixtures, binders and admixtures), setting and hardening process, construction methods, etc., are similar to those of concrete in civil engineering, it was once called refractory. Concrete.