Carbon steel pipe is made from ingots or solid round steel by piercing into a burr tube, and then made by hot rolling, cold rolling or cold dialing. Carbon steel pipe has an important position in China's steel pipe industry. According to incomplete statistics, China's existing carbon steel pipe production enterprises about more than 240, carbon steel pipe unit about 250 sets, the annual production capacity of about 4.5 million tons. From the caliber, <φ76, accounting for 35%, <φ159-650, accounting for 25%. From the variety, 1.9 million tons of general-purpose pipe, accounting for 54%; 760,000 tons of petroleum steel pipe, accounting for 5.7%; hydraulic pillar, precision tube 150,000 tons, accounting for 4.3% stainless tube bearing tube, automotive tube a total of 50,000 tons, accounting for 1.4%.

Classification

Carbon steel pipe is divided into two categories of 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.
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. 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 tube outer diameter can be up to 5mm, wall thickness less than 0.25mm, cold-rolled than hot-rolled high 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 production efficiency, 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 spraying water, 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.

Standard	API, ASTM, BS, DIN, GB, JIS
Outside Diameter	21.3-1420mm
Wall Thickness	2.11-300mm
Dia Tolerance	Control with in the standard, OD:+-1%, WT:+-10%
Materials	10#,20#,45#,Q235,Q345,Q195,Q215,Q345C,Q345A
	ASTM A53A/A53B/ A178C/A106B API5L
	ST37,ST37-2,DIN 1629 ST35, ST45,DIN 17175 ST35.8,DIN 17175 19Mn5
	16Mn,Q345B,T1,T2,T5,T9,T11,T12,T22,T91,T92,P1,P2,P5,P9,P11,P12,P22,P91,P92,15CrMO,Cr5Mo,10CrMo910,12CrMo,13CrMo44,30CrMo,A333 GR.1,GR.3,GR.6,GR.7
	Gr.B,X42,X46,X52,X60,X65,X70,X80,X100
Inspection	ISO,BV,SGS,MTC
Packing	Steel strip packed. Standard Export Seaworthy Package.Suit forall kinds of transport,or as required
Application	Widely used in Structure, Accessorize,Construction, Fluid transportation,machinery parts,the stress parts of the automobile tractor parts and so on
MOQ	1 ton,sample order accepted
Shipment time	Within 7-10 workdays after receiving deposit or L/C