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It mainly refers to steel with carbon mass fraction less than 2.11% without specially added alloy elements. Sometimes called plain carbon steel or carbon steel. It refers to iron carbon alloy with carbon content WC less than 2.11%. In addition to carbon, carbon steel generally contains a small amount of silicon, manganese, sulfur and phosphorus.

Carbon steel is an iron-carbon alloy with a carbon content of 0.0218% to 2.11%. Also called carbon steel. Generally also contains a small amount of silicon, manganese, sulfur, phosphorus. the higher the carbon content in carbon steel, the greater the hardness and the higher the strength, but the lower the plasticity.
According to the application, it can be divided into three categories: carbon structural steel, carbon tool steel and free-cutting structural steel.Carbon structural steel is further divided into engineering construction steel and machine manufacturing structural steel.
According to the processing technology, it can be divided into hot-rolled carbon steel and cold-rolled carbon steel.

Hot rolled steel is steel that has been roll-pressed at very high temperatures—over 1,700, which is above the re-crystallization temperature for most steels. This makes the steel easier to form, and resulting in products that are easier to work with. To process hot rolled steel, manufacturers first start with a large, rectangular length of metal, called a billet. The billet is heated and then sent for pre-processing, where it is flattened into a large roll. From there, it is kept at a high temperature and run through a series of rollers to achieve its finished dimensions. Steel shrinks slightly as it cools. Since hot rolled steel is cooled after processing, there is less control over its final shape, making it less suitable for precision applications. Hot rolled steel is often used in applications where minutely specific dimensions aren’t crucial.

Cold rolled steel is essentially hot rolled steel that has been through further processing. Once hot rolled steel has cooled, it is then re-rolled at room temperature to achieve more exact dimensions and better surface qualities.