The material of carbon steel plate is plain carbon steel or carbon steel, which is a steel with a carbon content of less than 2.11% and no metal elements intentionally added. In addition to carbon, it also contains a small amount of sulfur, silicon, phosphorus, manganese and other elements . Carbon steel plates can be divided into low carbon, medium carbon and high carbon according to the carbon content; according to the application, they can be divided into tools, structures, and free-cutting structural steel; according to the deoxidation method, they can be divided into boiling steel, semi-killed steel, killed steel, and special killed steel; According to the way of smelting, it can be divided into converter steel, open hearth furnace steel and electric furnace steel.