1) according to the use of carbon steel can be divided into carbon structural steel, carbon tool steel and free cutting structural steel three types, carbon structural steel is divided into engineering construction steel and machine made structural steel two kinds;
(2) according to the smelting method, it can be divided into open-hearth steel and converter steel;
(3) according to the deoxidization method, it can be divided into rimming steel (F), killed steel (Z), semi-killed steel (b) and special killed steel (TZ);
(4) according to the carbon content, carbon steel can be divided into low carbon steel (WC ≤ 0.25%), medium carbon steel (wc0.25%-0.6%) and high carbon steel (WC>0.6%);
(5) according to the quality of steel, carbon steel can be divided into ordinary carbon steel (higher phosphorus, sulfur), high quality carbon steel (lower phosphorus, sulfur), high quality steel (lower phosphorus, sulfur) and super quality steel.
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