Carbon steel is an iron-carbon alloy with carbon content of 0.0218%~2.11%. Also called carbon steel. Generally also contains small amounts of silicon, manganese, sulfur, phosphorus. The higher the carbon content in general carbon steel, the greater the hardness, the higher the strength, but the lower the plasticity. The role of carbon steel coil Carbon steel coil tube; Is made of ordinary carbon steel sheet a section of a section of winding and connected into a suitable low temperature low pressure meson, which is called carbon steel coil tube. Steel coil pipe belongs to seam pipe, compared with seamless steel pipe, due to the quality assurance of material and weld, the quality of seamless steel pipe is better than that of seam pipe. Seamless steel tubes must be used for compression elements of pressure bearing equipment. General non - bearing structure or structural parts can use steel coil pipe with a seam.