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Iron and steel is an alloy of iron and carbon, the main difference between them is that the carbon content of different. The iron carbon alloy containing less than 2% of the carbon content is called a steel, and the carbon content is more than 2%. Cast iron with fusible appropriate liquid, good liquidity, so it can be a complex shape parts. In addition, it has good performance and low cost, so it is widely used in machine manufacturing. Commonly used cast iron, ductile iron, ductile iron, malleable cast iron, alloy cast iron, etc.. The gray cast iron and ductile iron are brittle materials, and can not be used for rolling and forging. In the cast iron, gray iron is the most widely used, ductile iron.