Carbon steel plate: Carbon steel is carbon steel with a carbon content of less than 0.8%. This steel contains less sulfur, phosphorus and non-metallic inclusions than carbon structural steel, and has better mechanical properties. Carbon steel can be divided into three categories according to the carbon content: low carbon steel (C≤0.25%), medium carbon steel(C is 0.25-0.6%) and high carbon steel (C>0.6%).