The basic elements of steel are iron and carbon, steels with a higher carbon content are harder and more brittle, on the contrary, steels with a lower carbon content are more ductile and tough. Stainless steel is a type of steel contains iron, carbon, and at least 10.5% chromium content, the protective layer of chromium set a barrier between the iron in metal and water in the environment.

Low-carbon steel: 0.05 to 0.25% carbon content. Low carbon steels are more common than high carbon due to the lower production costs, greater ductility, and ease of manufacturing. Low carbon steel easy to machine and weld because of the ductility.

Carbon steel is a type of steel with carbon content from about 0.05% up to 3.8% by weight, typically between 0.12% and 2%. Most steels with more than 2.5% carbon content are made using powder metallurgy.

At present, the growth rate of crude steel output in my country's iron and steel industry is narrowing, steel consumption has continued to grow, and steel trade has shown new changes. Iron ore prices have fallen sharply after rising, corporate profits have increased significantly year-on-year, and steel prices have remained stable.

Cold-rolled sheets generally do not have a heating process before rolling. However, due to the small thickness of the strip steel, plate shape problems are prone to occur. Moreover, after cold rolling, it is a finished product. Therefore, in order to control the dimensional accuracy and surface quality of the strip steel, many cumbersome processes are used.