It is a steel with a carbon content of less than 2.11% and no intentional addition of metallic elements, and can also be called ordinary carbon steel or carbon steel. In addition to carbon, it contains small amounts of elements such as silicon, manganese, sulfur, and phosphorus. The higher the carbon content, the better the hardness and strength, but the lower the plasticity.

1. Hardness and wear resistance can be improved after heat treatment.

2. When annealing, the hardness is suitable and the cutting ability is good.

3. Its raw materials are very common, so it is easy to find, so the production cost is not high.

The disadvantages of carbon steel plate are :1; His thermal hardness is not good. When used as a tool material, if the temperature exceeds 200 degrees, the hardness and wear resistance will deteriorate.

2. His hardenability is poor. When water quenched, the diameter is usually maintained at 15 to 18 mm, while when unquenched, the diameter and thickness are usually 6 mm, making it easy to deform or crack. What is the classification of carbon steel? According to its use can be divided into structural steel, tool steel, free cutting structural steel three categories.

3. According to the smelting process, it can be divided into three kinds of open-hearth steel, converter steel and electric furnace steel.

4. According to the deoxidation path, it can be divided into boiling steel, killed steel, semi-killed steel and special killed steel.