Gray castings are forged from gray cast iron. Gray cast iron has low plasticity and toughness, but it has a certain strength, so it is also widely used in industry. However, the most impressive feature of gray castings is their shock absorption performance. When gray cast iron is used to make bases or racks on machinery and equipment, it can effectively absorb the energy of machine vibration. At the same time, due to the good thermal conductivity of gray castings It is also convenient for the factory to process, so it is suitable for casting castings with complex structures and thin-walled castings, such as automobile cylinder blocks and cylinder heads.