Carbon steel pipe is divided into two categories of hot rolled and cold rolled steel pipe.

Hot rolled carbon steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipe.

Cold rolled carbon steel pipe in addition to general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipe, including carbon thin-walled steel pipe, alloy thin-walled steel pipe, stainless thin-walled steel pipe, shaped steel pipe. Hot rolled seamless pipe outer diameter is generally greater than 32mm, wall thickness 2.5-75mm, cold rolled seamless steel pipe outer diameter can be up to 6mm, wall thickness can be up to 0.25mm, thin-walled pipe outer diameter can be up to 5mm, wall thickness is less than 0.25mm, cold rolled than hot rolled dimensional accuracy.

General carbon steel pipe: 10, 20, 30, 35, 45 and other high-quality carbon steel 16Mn, 5MnV and other low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steels made of hot-rolled or cold-rolled. 10, 20 and other low-carbon steel made of seamless pipe is mainly used for fluid transportation pipelines. 45, 40Cr and other medium-carbon steel made of seamless pipe used to manufacture Mechanical parts, such as automobiles, tractor parts. General use of carbon steel pipe to ensure the strength and flattening test. Hot rolled steel pipe is delivered in hot rolled condition or heat treated condition; cold rolled is delivered in heat treated condition.