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seamless steel pipe

seamless steel pipe

Seamless steel pipes, known as the "blood vessels" of industry, are important raw materials for national industrial and national defense construction. 
seamless steel tube

Seamless Pipe Detail:

Shape:round,square,rectangular or shaped.
Out Diameter(φ):1/4 inch-36 inch(6.35-914mm)
Wall Thickness:1.25-50mm(SCH10,SCH40,SCH60,XS,SCH80,STD,XXS,SCH120,SCH160)
Length: 0.5-24M or cut according to requirements
Tolerance:±%10 or According to customer requirements
MOQ:2-5 Tons
Payment Term: TT/LC
Delivery time:7-40 days
Packing:Steel strip bundling, PVC wrapped fabric
Capacity: 50000 tons per month
Standard: API 5L PSL1/PSL2 Gr.b, X42/46/52/56/65/70,API 5CT,GB/T9711,ASTM A53,ASTM A106,ASTM A519,etc.
Brand: Yuantai Derun or OEM
Type: Hydraulic pipe,Boiler tubes,Fluid tube,Fire pipe,
Conduit,Structural tube,Mechanical tube.
Characteristics Of Seamless Steel Pipes

High strength

Seamless steel pipes are made of a single billet, and their overall strength is superior to that of welded pipes. Has high tensile strength and elastic modulus, able to withstand high pressure and high temperature working conditions.

Excellent mechanical performance

Seamless steel pipes have good mechanical properties, are easy to machine, do not deform during repeated use, maintain high elasticity, have no memory, and are not prone to cracking and leakage.

Strong Corrosion Resistance

The corrosion resistance of seamless steel pipes has been further improved due to the production process of hot rolling or first hot rolling and then cold rolling, especially in terms of acid, alkali, salt, and atmospheric corrosion resistance, with excellent performance.

Environmentally friendly and recyclable

Seamless steel pipes have good recyclability and reusability, meet environmental requirements, and in the long run, their cost-effectiveness is significant.
Seamless Steel Pipe Application
》Transporting oil
Transporting natural gas
Transporting gas
Transporting water
Transporting solid materials
》Manufacturing structural components
》Mechanical parts
》Drill pipe 
》Automobile transmission shaft
》Bicycle frame
》Building steel
》Manufacturing circular parts
》Fertilizer industry
》Heat exchanger
Food manufacturing
》Pump, hydraulic cylinder
》Pressure vessel
》High temperature container

Seamless Pipe Manufacturing Process

Seamless Pipe Manufacturing Process
The main production processes of hot-rolled seamless steel pipes include: preparation and inspection of pipe billets - heating of pipe billets - perforation - rolling of pipes - reheating of steel pipes - sizing (reduction) - heat treatment - straightening of finished pipes - finishing - inspection (non-destructive, physical and chemical, bench inspection) - storage.

The main production processes of cold-rolled (drawn) seamless steel pipes include billet preparation, acid pickling and lubrication, cold rolling (drawing), heat treatment, straightening, finishing, and inspection. The production process of cold-rolled seamless steel pipes is generally more complex than hot rolling

ASTM Standards For Seamless Steel Pipes

Standard Executive
Product Name
Black and Hot-Dipped Galvanized Steel Pipes Welded and Seamless
Seamless Carbon Steel for High Temperature Service
Low Carbon Steel
Seamless Cold-Drawn Low-Carbon Steel Heat Exchanger and Condenser Tubes
Low Carbon Steel
Seamless Carbon Steel Boiler Tubes for High Pressure
A1, C
Seamless Medium-Carbon and Alloy Steel Boiler and Superheater Tubes
T5, T11, T12, T22 ,TP 347H
Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-Exchanger Tubes
TP304/304L, TP316/316L
Seamless Steel Pipe for Stainless Materials
Seamless and Welded Steel Pipe for Low-Temperature Service
P9, P11, P22
Seamless Ferritic Alloy Steel Pipe for High-Temperature Service
Seamless Carbon and Alloy Steel for Mechanical Tubing
Seamless Ferritic/Austenitic Stainless Steel Tubing for General Service

API Standards For Seamless Steel Pipes

Executive Standard
Grade / Material
Product Name
API Spec 5CT
J55, K55, N80, L80,C90, C95, T95, P110, M65
Spectification for Casing and Tubing
API Spec 5L PSL1
A,B X42, X46, X52, X56, X60, X65,. X70
Specification for Line Pipe
API Spec 5L PSL2
A,B X42, X46, X52, X56, X60, X65 X70
Specification for Line Pipe

DIN / EN Standards For Seamless Steel Pipes

Executive Standard
Grade / Material
Product Name
DN 17175/EN10216-2
ST35, ST45, ST52, 13CrMo44
Seamless Steel Tube for Elevated Temperature
DIN 2391/EN10305-1
St35, St45, St52
Cold Drawn Seamless Precision Pipe
DIN 1629/EN10216-1
St37, St45, St52
Seamless Circular unalloyed Steel Pipes Subject to Special Requirements


What is a seamless steel pipe?

Seamless steel pipe is made of the whole round steel perforation, the surface of the steel pipe without welds is called seamless steel pipe
What is difference between seamless and welded pipe?

The seamless steel pipe is produced via hot rolling and cold rolling, and has no seams as the name suggests. In contrast, a welded pipe is made by rolling a steel coil to the required gauge thickness, which results in a seam on the pipe's body.
What are the disadvantages of seamless pipes?

The most obvious defect of seamless steel pipes is that the accuracy of pipe dimensions is not high before cold rolling or cold drawing treatment.
In addition, there is also a long production time. Producing a welded pipe with the same diameter also requires a shorter production time.
what Are the meaning of CDS and HFS?
CDS means cold drawn seamless. HFS means hot finished seamless.
Is seamless Steel pipe Stronger than Welded Steel Pipe?
Yes.The strength of seamless steel pipe is superior to that of welded steel pipe under the same conditions. The reason is that the seamless pipe is made of a steel perforated extrusion moulding, there is no any weld. Welded pipe, however, there is a parent material and welding raw materials, in the production process, welded pipe weld even if the fusion of the best is not as good as a parent material moulding to the perfect.
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