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    Seamless Steel Pipe

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

    Seamless steel pipe size


    seamless steel pipe size

    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


    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.

    pipe marking

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