Carbon structural steel is divided into engineering construction steel and machine manufacturing structural steel;
According to the smelting method, it can be divided into open hearth steel and converter steel;
According to the deoxidation method, it can be divided into boiling steel (f), killed steel (z), semi-killed steel (b) and special killed steel (TZ);
According to the carbon content, carbon steel can be divided into low carbon steel (WC ≤ 0.25%), medium carbon steel (WC 0.25% - 0.6%) and high carbon steel (WC > 0.6%).