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Description

Cast iron

• Composition elements: Cast iron is mainly composed of iron, carbon and silicon, and the carbon content exceeds the amount that can be retained in the austenite solid solution at the eutectic temperature. In addition, cast iron also contains more impurities such as manganese, sulfur, phosphorus, etc. Sometimes, in order to further improve its mechanical properties or physical and chemical properties, a certain amount of alloying elements will be added.
• Carbon content: The carbon content of cast iron is usually greater than 2.11% (generally 2.5-4%), which is also an important feature that distinguishes it from other iron alloys.
• Classification: Cast iron can be divided into many types according to the different forms of carbon in cast iron. For example, when carbon exists in the form of flake graphite, its fracture is gray, which is called gray cast iron. Gray cast iron has good machinability, wear resistance and casting properties, but low tensile strength. In addition, there is white cast iron, in which except for a small amount of carbon dissolved in ferrite, the rest of the carbon exists in the form of cementite, and its fracture is silvery white.
• Uses: Cast iron is widely used in many fields. Due to its high hardness and strength, cast iron is one of the most commonly used materials in the machinery manufacturing industry. It can be used to manufacture various mechanical components and parts, such as gears, crankshafts, reducers, etc. In addition, cast iron is also widely used in automobile manufacturing, construction, agriculture and other fields, such as manufacturing engine water tanks, brake drums, crankshaft housings, rainwater pipes, iron doors, window frames, plows, tractor engine cylinders, etc.
• Precautions: Cast iron is brittle and should be used to avoid impact or vibration.
• In summary, cast iron is an important alloy material. Its unique composition and properties make it widely used in many fields.