Ordinary round steel material containing less than 1 percent carbon, 35, in addition to iron, carbon and limited within the silicon, manganese, phosphorus, sulfur and other impurities, does not contain other alloying elements of steel. The performance of carbon steel depends mainly on the carbon content. Carbon content increases, the steel strength, hardness, plasticity, toughness and weldability decrease. Compared with other steels, carbon steel used in the earliest, low cost, wide range of performance, the largest amount.
Ordinary round steel according to the chemical composition can be divided into low carbon steel, medium carbon steel and high carbon steel.
Low carbon steel: carbon content from 0.10 percent to 0.30 percent low carbon steel is easy to accept a variety of processes such as forging.
Medium Carbon Steel: Carbon steel with 0.25 to 0.60 percent carbon. There are a variety of products such as sedentary steel, semi-sedentary steel, boiling steel. In addition to carbon can also contain a small amount of manganese.
High-carbon steel: often called tool steel, carbon content from 0.60 percent to 1.70 percent, can be hardened and tempered.