content: low carbon steel (C≤0.25%), medium carbon steel(C is 0.25-0.6%) and high carbon steel

(C>0.6%).

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.