High quality carbon structural steel is a carbon steel with carbon content less than 0.8%. This steel contains less sulfur, phosphorus and non-metallic inclusions than carbon structural steel, and has excellent mechanical properties. High quality carbon structural steel can be divided into three categories according to different carbon content: low carbon steel (C ≤ 0.25%), medium carbon steel (C = 0.25-0.6%) and high carbon steel (c > 0.6%). High quality carbon structural steel can be divided into two groups according to different manganese content: normal manganese content (0.25% - 0.8%) and high manganese content (0.70% - 1.20%) with better mechanical properties and processing properties.

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