The traditional wear-resistant casting lining plate is generally made of high strength steel, low alloy steel and other materials by integral casting. Under the working condition of ball mill, the wear-resistant casting lining plate, on the one hand, bears the wear and corrosion of metal ore and its materials, on the other hand, it also bears the repeated impact of heavy grinding ball. Therefore, it is difficult for a single material to have the characteristics of wear-resistance and impact resistance. Carbon steel and high chromium cast iron have relatively uniform solidification shrinkage, good matching in the composite casting process, and large casting stress will not be generated near the composite interface, which also reduces the probability of casting defects. In this chapter, the trial production of high chromium cast iron and carbon steel bimetallic casting lining plate is carried out based on the bimetallic liquid lost foam composite casting process. It is expected to combine the high strength and high corrosion resistance of high chromium cast iron with the high toughness and high ductility of carbon steel to form complementary advantages and solve the contradiction between hardness and directivity of a single material.
The bottom layer of the casting lining plate mainly bears the impact force generated during the free fall of the alloy grinding ball in the ball mill and the material crushing process. The main function of the material of this layer is to provide sufficient strength and toughness, avoid the fracture of the casting lining plate in use, and reduce the distortion and deformation between the locating pin and connecting bolt shaft holes.
Taking the above into account, the chemical composition of carbon steel material in the strong bremsstrahlung layer of cast lining plate in the test is shown in the table:
| C | Si | Mn | S | P | |
| Low alloy carbon steel | 0.18-0.22 | 0.6-0.9 | 0.9-1.2 | <0.035 | <0.035 |