Carbon structural steel is carbon steel containing less than 0.8% of carbon, this steel contains less sulfur, phosphorus and non-metallic inclusions than carbon structural steel, mechanical properties are better.
Carbon structural steel can be divided into three types according to the carbon content: low carbon steel (C≤0.25%), medium carbon steel (C 0.25-0.6%) and high carbon steel (C > 0.6%).
Carbon structural steel is divided into normal manganese content (manganese content 0.25%-0.8%) and high manganese content (manganese content 0.70%-1.20%) two groups according to different manganese content, the latter has better mechanical properties and processing properties.