Carbon Steel Pipe

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Seamless Steel Pipe

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seamless steel pipeSeamless Steel Pipe/Tube (SMLS Pipe/Tube), Seamless Precision Pipe, MS Large Diameter Seamless Pipe


Out diameter: 1/4"-36"

Wall thickness:1.25mm-50mm



Hydraulic pipe, Boiler Tube, Fluid Pipe, Fire Pipe, Line Pipe, Structure Tube, Mechanical tube


Cold drawn tube

Hot rolled tube


Black Seamless Pipe

Gi Seamless Pipe


Black ends, Bevelled ends, Plain ends


Water underground / Sewage / Treatment Steel scaffolding / Transporting oil & gas / Boiler and condenser tubes / High-pressure applications / Chemical processing

Manufacturing Process:

Billets and coils are delivered to the pipe mill ready to be made into carbon steel pipe. Depending on the capabilities of the pipe mill and the end use of the final product, the casts will be formed into pipe by means of four distinct different manufacturing.Seamless carbon steel pipe has, as its name implies, no longitudinal weld seam. It is, in essence, one solid homogeneous piece of steel. A solid billet is simply heated and then stretched over a series of mandrels until the pipe has achieved its desired diameter and wall thickness.

Is seamless pipe stronger than welded pipe?
Seamless steel pipe has better pressure capacity, strength is higher than ERW welded steel pipe. So it is widely applied in high pressure equipment, and thermal, boiler industries. Generally the welding seam of the welded steel pipe is the weak point, the quality affect overall performance.

ASTM Standard for seamless steel pipe

Executive Standard

Grade / Material

Product Name


A, B

Black and Hot-Dipped Zinc-Coated Steel Pipes Welded and Seamless


A, B

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
ASTM A312 TP304/304L, TP316/316L Seamless Steel Pipe for Stainless Materials
ASTM A333 Gr.6 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 Standard for seamless steel pipe

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 / PSL2

A,B X42, X46, X52, X56, X60, X65,. X70

Specification for Line Pipe

DIN / EN Standard for seamless steel pipe

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 Tubes Subject to Special Requirments

Pipe Marking:

a. The seamless steel pipe marking shall include the following: manufacturer's name or trademark, product standard number, steel grade, seamless steel pipe specification and traceability identification number (heat number).
b. The marking can be done by jet printing, stamping, rolling, printing, pasting or sticking labels.
c. The marking is required to be eye-catching and clear, with firm handwriting and not easy to fade.