Carbon Steel has a mixture of steel and carbon with carbon being 2.1% of the total content by weight. Carbon Steel pipes do not contain specific quantities of cobalt, chromium, nickel, niobium, titanium, tungsten, vanadium, zirconium and other elements. Copper in carbon steel does not exceed 0.40%. Also, it contains manganese 1.65%, silicon 0.60%, and copper 0.60%.
Increasing carbon content in steel will increase the strength and hardness of steel through heat treating. Heat treating causes reduced ductility. The increased carbon content in these steel pipes also reduces weldability. Carbon steels are divided in three types’ viz. low-carbon steel pipes, high tensile steel pipes and high-carbon steels pipes. Low -carbon Steel pipes have relatively low tensile strength. Surface hardness of Low-carbon steel is increased through carburizing. High tensile carbon steel pipes are added with alloyants to increase strength and tensile strength. High carbon steel pipes can successfully undergo heat-treatment. The carbon content in these pipes is 0.9-2.0%, which makes them strong. Hardenability is improved through addition of manganese in low-carbon steels.