Carbon steel products include low carbon steel, medium carbon steel, and high carbon steel. The carbon content of low carbon steel is 0.04-0.3%. It is the most common carbon steel grade. Low carbon steel has ductility and high plasticity and can be used for Automotive body parts, sheet and wire products. Medium carbon steel has a carbon content ranging from 0.31-0.6% and a manganese content ranging from 0.6-1.65%. This steel can be heat treated and quenched to further adjust the microstructure and mechanical properties. Popular applications include shafts, axles, gears, guide rails and railroad wheels. High carbon steel has a carbon content of 0.6-1% and a manganese content of 0.3-0.9%. The properties of high carbon steel make it suitable for use as springs and high-strength wire. These products cannot be welded unless detailed heat treatment procedures are included in the welding procedure. High carbon steel is used in cutting tools, high strength wire and springs.