The formation of the gray iron part consists of directly smelting the pig iron into molten iron without any auxiliary raw materials and then being poured into the green sand casting model or shell sand casting model for the roughcasting items.

Gray cast iron has excellent cutting performance, casting performance and vibration absorption performance, with advantages of good friction reduction and high compressive strength. And the disadvantages of grey iron cast are poor plasticity, low toughness, no forgeability, and poor weldability.