Brick mold meets the requirements of: Die entire mold making process of selection is a very important aspect. Brick mold mold material selection need to meet three principles, mold meet abrasion resistance, toughness and other work requirements, tooling to meet the technical requirements, while the mold should meet the economic suitability. Satisfy the requirements of a working conditions, wear a blank in the mold cavity plastic degeneration, both along the cavity surface flow again slid to make the blank between the cavity surface and produce intense friction, resulting in mold due to wear and failure. So wear resistance is the most basic mold, one of the most important properties. The main factors affecting the hardness of the wear resistance. In general, the higher the hardness of the mold parts, the smaller the amount of wear, the better the wear resistance. In addition, the wear resistance also with the type, quantity, shape, size and distribution of materials related carbides. 2, the strength and toughness of the mold are mostly very poor working conditions, some often withstand greater impact loads, resulting in brittle fracture. To prevent mold parts sudden brittle fracture at work, the mold should have a high strength and toughness. Die toughness depends on the carbon content of the material, grain size and organization of the state. 3, fatigue fracture properties of the mold work, in the long term effect of cyclic stress often leads to fatigue fracture. There is little energy in the form of repeated impact fatigue fracture, tensile fatigue fracture contact fatigue fracture and bending fatigue fracture. Fatigue fracture properties of the mold depends mainly on its strength, toughness, hardness, and the content of the material inclusions. 4, high temperature performance when the mold into a higher operating temperature, hardness and strength will decline, leading to early die wear or plastic deformation and failure. Therefore, the mold material should have a high temper resistance, to ensure that the mold at operating temperatures, high hardness and strength. 5, resistance to thermal fatigue performance of some mold in the repeated heating and cooling of the state in the work process, so that the cavity surface tension, the pressure becomes stress, cause surface cracking and spalling, increasing friction and hinder plastic deformation, reduces the dimensional accuracy, resulting in mold failure. Thermal fatigue is one of the main forms of hot work die failure, to help this type of mold should have a high resistance to thermal fatigue performance. 6, the corrosion resistance of some of the mold during plastic working such as due to a chlorine, fluorine and other elements in the presence of the plastic, after the precipitation of the decomposition heat HCI, HF and other strong corrosive gases, erosion of the mold cavity surface to increase the surface roughness , increased wear failure.