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
ASTM A53 | A, B | Black and Hot-Dipped Zinc-Coated Steel Pipes Welded and Seamless
ASTM A106 | A, B | Seamless Carbon Steel for High Temperature Service
ASTM A179 | Low Carbon Steel | Seamless Cold-Drawn Low-Carbon Steel Heat Exchanger and Condenser Tubes
ASTM A192 | Low Carbon Steel | Seamless Carbon Steel Boiler Tubes for High Pressure
ASTM A210 | A1, C | Seamless Medium-Carbon and Alloy Steel Boiler and Superheater Tubes
ASTM A213 | 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
ASTM A335 | P9, P11, P22 | Seamless Ferritic Alloy Steel Pipe for High-Temperature Service
ASTM A519 | 4130,4140 | Seamless Carbon and Alloy Steel for Mechanical Tubing
ASTM A789 | - | 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.


Country of origin

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