Refractory prefabricated parts belong to the category of unshaped refractory materials, also known as castable prefabricated blocks and unshaped refractory prefabricated blocks. The castables are mixed and poured into the desired shape through a mold. They have diverse shapes and superior performance, and are more flexible to use than shaped products. According to the type of aggregate, they can be divided into clay, high-alumina, silicon carbide, corundum and other prefabricated parts; the weight of prefabricated parts ranges from tens of kilograms to several tons, so they can be divided into large, medium and small prefabricated parts; some prefabricated parts have steel bars and anchors inside, which can also be divided into ordinary prefabricated parts, steel bar prefabricated parts and anchor prefabricated blocks.