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Seamless Carbon Steel Pipe Manufacturer | ASTM A53, A106 & API 5L

Seamless carbon steel pipes are manufactured by piercing solid round steel billets to form a seamless tubular structure without welded joints. With a smooth surface, uniform strength, and reliable pressure resistance, they are widely used for fluid transportation, structural applications, and industrial piping systems.

Product Name: SMLS Pipe,Seamless Carbon Steel Pipe,Seamless Tubes
(O.D)Outer: 13.7-610mm
Wall Thickness: Sch10,Sch20,Std,Sch40,Sch60,XS,Sch80,Sch100,
Sch120,Sch160,XXS
Pipe Ends: Plain ends Or Beveled ends
Surface: Bare or Black Painted
Length: 2m~12mtr
Standard: ASTM A53/API 5L/ASTM A106/GB8163-1999/ASME B36.10M-1996.
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    Carbon Steel Seamless Pipe Specifications

    Our carbon steel seamless pipes are available in a wide range of outside diameters, wall thicknesses, and standard dimensions to meet the requirements of different piping systems. In addition to standard sizes, customized dimensions can be produced according to project requirements, including larger diameters and specific wall thicknesses. This flexibility makes our seamless pipes suitable for industrial, structural, and fluid transportation applications. For detailed size options or customized specifications, please contact our team for technical and production support.

    Carbon steel seamless pipes in various sizes and specifications
    DN NB(inch) ASME SCH10 SCH20 SCH30 STD SCH40 SCH60 XS SCH80 SCH100 SCH120 SCH140 SCH160 XXS
    (mm) (mm) (mm) WT WT WT WT WT WT WT WT WT WT WT WT WT
    15 1/2" 21.3 2.11 - 2.41 2.77 2.77 - 3.73 3.73 - - - 4.78 7.47
    20 3/4" 26.7 2.11 - 2.41 2.87 2.87 - 3.91 3.91 - - - 5.56 7.82
    25 1" 33.4 2.77 - 2.9 3.38 3.38 - 4.55 4.55 - - - 6.35 9.09
    32 1.1/4" 42.2 2.77 - 2.97 3.56 3.56 - 4.85 4.85 -
    -    		 - 6.35 9.7
    40 1.1/2" 48.3 2.77
    -    		 3.18 3.68 3.68 - 5.08 5.08 -
    -    		 - 7.14 10.15
    50 2" 60.3 2.77 - 3.18 3.91 3.91 - 5.54 5.54 -
    -    		 - 8.74 11.07
    65 2.1/2" 73 3.05
    -    		 4.78 5.16 5.16 - 7.01 7.01 -
    -    		 - 9.53 14.02
    80 3" 88.9 3.05 - 4.78 5.49 5.49 - 7.62 7.62 - - - 11.13 15.25
    90 3.1/2" 101.6 3.05
    -    		 4.78 5.74 5.74 - 8.08 8.08 -
    -    		 - - -
    100 4" 114.3 3.05 - 4.78 6.02 6.02 - 8.56 8.56 - 11.13 - 13.49 17.12
    125 5" 141.3 3.4 - - 6.55 6.55 - 9.53 9.53 - 12.7 - 15.88 19.05
    150 6" 168.3 3.4 - - 7.11 7.11 - 10.97 10.97 - 14.27 - 18.26 21.95
    200 8" 219.1 3.76 6.35 7.04 8.18 8.18 10.31 12.7 12.7 15.09 18.26 20.62 23.01 22.23
    250 10" 273 4.19 6.35 7.8 9.27 9.27 12.7 12.7 15.09 18.26 21.44 25.4 28.58 25.4
    300 12" 323.8 4.57 6.35 8.38 9.53 10.31 14.27 12.7 17.48 21.44 25.4 28.58 33.32 25.4
    350 14" 355.6 6.35 7.92 9.53 9.53 11.13 15.09 12.7 19.05 23.83 27.79 31.75 35.71 -
    400 16" 406.4 6.35 7.92 9.53 9.53 12.7 16.66 12.7 21.44 26.19 30.96 36.53 40.19 -
    450 18" 457.2 6.35 7.92 11.13 9.53 14.27 19.05 12.7 23.83 39.36 34.93 39.67 45.24 -
    500 20" 508 6.35 9.53 12.7 9.53 15.09 20.62 12.7 26.19 32.54 38.1 44.45 50.01 -
    550 22" 558.8 6.35 9.53 12.7 9.53 - 22.23 12.7 28.58 34.93 41.28 47.63 53.98 -
    600 24" 609.6 6.35 9.53 14.27 9.53 17.48 24.61 12.7 30.96 38.89 46.02 52.37 59.54 -
    seamless steel tube Packing & Loading (2)

    ASTM A53, ASTM A106 and API 5L: Key Differences

    Although ASTM A53 and ASTM A106 seamless pipes have similar chemical and mechanical characteristics, they are designed for different service conditions. ASTM A53 Grade B is commonly selected for general mechanical and pressure applications, while ASTM A106 Grade B is specifically intended for high-temperature service and demanding industrial piping systems. API 5L seamless pipe, on the other hand, is developed primarily for oil and gas pipeline transportation, with chemical composition and mechanical requirements varying by grade. The choice between these standards should therefore be based on operating temperature, pressure, fluid service, pipeline requirements, and the applicable project specifications.

    Standard Grade Chemical Components(%) Mechanical Properties
    C Si Mn P S Tensile Strength(Mpa) Yield Strength(Mpa)
    ASTM A53 A ≤0.25 - ≤0.95 ≤0.05 ≤0.06 ≥330 ≥205
    B ≤0.30 - ≤1.2 ≤0.05 ≤0.06 ≥415 ≥240
    ASTM A106 A ≤0.30 ≥0.10 0.29-1.06 ≤0.035 ≤0.035 ≥415 ≥240
    B ≤0.35 ≥0.10 0.29-1.06 ≤0.035 ≤0.035 ≥485 ≥275
    PI 5L PSL1 A 0.22 - 0.9 0.03 0.03 ≥331 ≥207
    B 0.28 - 1.2 0.03 0.03 ≥414 ≥241
    X42 0.28 - 1.3 0.03 0.03 ≥414 ≥290
    X46 0.28 - 1.4 0.03 0.03 ≥434 ≥317
    X52 0.28 - 1.4 0.03 0.03 ≥455 ≥359
    X56 0.28 - 1.4 0.03 0.03 ≥490 ≥386
    X60
    0.28
    -
    1.4
    0.03
    0.03    		 ≥517 ≥448
    API 5L PSL2 X65 0.28 - 1.4 0.03 0.03 ≥531 ≥448
    X70 0.28 - 1.4 0.03 0.03 ≥565 ≥483
    B 0.24 - 1.2 0.025 0.015 ≥414 ≥241
    X42 0.24 - 1.3 0.025 0.015 ≥414 ≥290
    X46 0.24 1.4 0.025 0.015 ≥434 ≥317
    X52 0.24 - 1.4 0.025 0.015 ≥455 ≥359
    X56 0.24 - 1.4 0.025 0.015 ≥490 ≥386
    X60 0.24 - 1.4 0.025 0.015 ≥517 ≥414
    X65 0.24 - 1.4 0.025 0.015 ≥531 ≥448
    X70 0.24 - 1.4 0.025 0.015 ≥565 ≥483
    X80 0.24
    -    		 1.4 0.025 0.015 ≥621 ≥552

    Seamless Carbon Steel Pipe Manufacturing Process

    The manufacturing of seamless carbon steel pipe involves several carefully controlled stages to ensure reliable quality, dimensional accuracy, and mechanical performance.

    1. Heating
    Steel billets are heated evenly to the required temperature. Proper temperature control helps prevent local overheating, underheating, and unwanted changes in the material structure.
    2. Piercing
    The heated billet is pierced to form the hollow pipe blank. During this stage, deformation is closely monitored to reduce the risk of defects such as cracks, folds, and uneven wall thickness.
    3. Rolling
    The pipe is processed through hot or cold rolling according to the required specifications. Key parameters, including rolling temperature, reduction, and dimensional tolerances, are precisely controlled to achieve consistent pipe dimensions.
    4. Heat Treatment
    Depending on the steel grade and final application, suitable heat treatment methods such as annealing, normalizing, quenching, or tempering are selected. Temperature, holding time, and cooling rate are carefully controlled to obtain the required strength, toughness, and structural stability.
    Seamless carbon steel pipe heat treatment and quality control process
    Seamless carbon steel pipe heating and billet preparation process
    Seamless carbon steel pipe piercing and rolling manufacturing process
    Seamless carbon steel pipe heat treatment and quality control process (2)

    FAQs

    • Q1: What is the difference between ASTM A53 and ASTM A106 seamless pipes?

      A1: ASTM A53 is commonly used for general pressure, mechanical, and structural applications, while ASTM A106 is designed for seamless carbon steel piping in high-temperature and high-pressure service. The appropriate grade depends on the operating conditions and project requirements.

    • Q2: What is API 5L seamless pipe mainly used for?

    • Q3:Can carbon steel seamless pipes be customized to specific sizes?

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