Machine tool castings, also known as large castings, beds, bases, and worktables, feature: ⑴ Low wear and good shock absorption. ⑵ Good process performance. Due to the high carbon content in gray cast iron, which is close to eutectic composition, the melting point is relatively low, has good fluidity, a small shrinkage rate, and is therefore suitable for casting complex structures or thin-walled castings. Additionally, because graphite makes it easier to form chips during cutting, the machinability of gray cast iron is superior to that of steel.