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Carbon steel pipe


Carbon steel pipe is made from ingots or solid round steel by piercing to make a rough tube, and then by hot rolling, cold rolling or cold dialing.


Carbon steel pipe is divided into two categories: hot-rolled and cold-rolled (drawn) 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. Hot-rolled seamless pipe outside diameter is generally greater than 32mm, wall thickness of 2.5-75mm.


Cold rolled (dial) carbon steel pipe in addition to the 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. Cold-rolled seamless steel pipe outer diameter can be up to 6mm, wall thickness can be up to 0.25mm, thin-walled tube 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: is made of 10, 20, 30, 35, 45 and other high-quality carbon knotted steel 16Mn, 5MnV and other low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steel hot-rolled or cold-rolled. 10, 20 and other low-carbon steel made of seamless pipe is mainly used for fluid transmission pipeline. 45, 40Cr and other medium carbon steel made of seamless pipe is used to manufacture Mechanical parts, such as automobiles and tractors' stressed parts. The general use of carbon steel pipe to ensure the strength and crush test. Hot-rolled steel pipe is delivered in hot-rolled or heat-treated condition; cold-rolled is delivered in heat-treated condition.

Preparation method

The raw material for carbon steel pipe is a round pipe billet, round pipe embryo to be cut and processed by a cutting machine into a length of about 1 meter of billet, and sent by conveyor belt to the furnace for heating.

The billet is heated in the furnace at a temperature of about 1200 degrees Celsius.

The fuel is hydrogen or acetylene. Temperature control in the furnace is a key issue. After the round billet is discharged from the furnace, it is hollowed out by a pressure piercing machine. The more common perforating machine is the conical roller perforating machine, which has high productivity, good product quality, large perforation and expansion capacity, and can perforate a variety of steel grades.

After perforation, the round pipe billet has been three rolls of oblique rolling, continuous rolling or extrusion. After extrusion, the tube should be sized.

Sizing machine through the conical drill bit high-speed rotation into the steel embryo perforation, the formation of steel pipe. The inner diameter of the steel pipe is determined by the length of the outer diameter of the sizing machine bit. After sizing, the steel pipe enters the cooling tower and is cooled by water spray, and after cooling, the steel pipe is straightened.

Steel pipe is straightened and sent by conveyor belt to the metal flaw detector (or hydraulic test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, they will be detected. The steel pipe quality inspection is followed by a strict hand selection. After quality inspection, the steel pipe is sprayed with paint with number, specification, production lot number, etc. and lifted into the warehouse by crane.

We offer schedule 40 carbon steel pipe, if you are interested, please feel free to contact us.