Seamless Steel Pipe

Seamless Steel Pipe

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Seamless pipe, as the name suggests, is a pipe without a seam or a weld-joint. Seamless Steel Pipe is made from a solid round steel ‘billet’ which is heated and pushed or pulled over a form until the steel is shaped into a hollow pipe.

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    • Commodity name: Seamless Steel Pipe

    Seamless pipe, as the name suggests, is a pipe without a seam or a weld-joint. Seamless Steel Pipe is made from a solid round steel ‘billet’ which is heated and pushed or pulled over a form until the steel is shaped into a hollow pipe.

    Product introduction

    This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. The pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. All seamless and welded pipes shall be treated to control their micro-structure. Tensile tests, impact tests, hydro-static tests, and nondestructive electric tests shall be made in accordance to specified requirements.
    1. Scope
    1.1 This specification covers nominal (average) wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures. Several grades of ferric steel are included as listed in Table 1. Some product sizes may not be available under this specification because heavier wall thicknesses have an adverse affect on low-temperature impact properties.
    1.2 Supplementary Requirement S1 of an optional nature is provided. This shall apply only when specified by the purchaser.
    1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in non-conformance with the specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.

    Technical data

    Seamless Steel Pipe Chemical Composition and Mechanical Properties

    This data is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    Standard Grade Chemical Composition (%) Mechanical Properties
    ASTM A53 C Si Mn P S Tensile STrength(Mpa) Yield STrength(Mpa)
    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
    ASTM A179 A179 0.06-0.18 - 0.27-0.63 ≤0.035 ≤0.035 ≥325 ≥180
    ASTM A192 A192 0.06-0.18 ≤0.25 0.27-0.63 ≤0.035 ≤0.035 ≥325 ≥180
    API 5L PSL1 A 0.22 - 0.90 0.030 0.030 ≥331 ≥207
    B 0.28 - 1.20 0.030 0.030 ≥414 ≥241
    X42 0.28 - 1.30 0.030 0.030 ≥414 ≥290
    X46 0.28 - 1.40 0.030 0.030 ≥434 ≥317
    X52 0.28 - 1.40 0.030 0.030 ≥455 ≥359
    X56 0.28 - 1.40 0.030 0.030 ≥490 ≥386
    X60 0.28 - 1.40 0.030 0.030 ≥517 ≥448
    X65 0.28 - 1.40 0.030 0.030 ≥531 ≥448
    X70 0.28 - 1.40 0.030 0.030 ≥565 ≥483
    API 5L PSL2 B 0.24 - 1.20 0.025 0.015 ≥414 ≥241
    X42 0.24 - 1.30 0.025 0.015 ≥414 ≥290
    X46 0.24 - 1.40 0.025 0.015 ≥434 ≥317
    X52 0.24 - 1.40 0.025 0.015 ≥455 ≥359
    X56 0.24 - 1.40 0.025 0.015 ≥490 ≥386
    X60 0.24 - 1.40 0.025 0.015 ≥517 ≥414
    X65 0.24 - 1.40 0.025 0.015 ≥531 ≥448
    X70 0.24 - 1.40 0.025 0.015 ≥565 ≥483
    X80 0.24 - 1.40 0.025 0.015 ≥621 ≥552

    Carbon Steel Seamless Pipe Chemical Composition and Mechanical Properties 

    Standard Grade Chemical Composition Mechanical Properties
    C Si Mn P S Cr Ni Cu Tensile Strength(Mpa) Yield Strength(Mpa) Elongation(%)
    GB/T8163 10 0.07-0.14 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035 ≤0.15 ≤0.25 ≤0.25 335-457 ≥205 ≥24
    20 0.17-0.24 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035 ≤0.25 ≤0.25 ≤0.25 410-550 ≥245 ≥20
    Q345 0.12-0.20 0.20-0.55 1.20-1.60 ≤0.045 ≤0.045 - - - 490-665 ≥325 ≥21


     Carbon Steel Seamless Pipe Tolerance 

    Pipe types Pipe Szie(mm) Tolerances
    Hot rolled OD All ±1% (min ±0.50mm)
    WT All +15%, -12.5%
    Cold drawn OD 6~10 ±0.20mm
    10~30 ±0.40mm
    30~50 ±0.45mm
    >50 ±1%
    WT ≤1 ±0.15mm
    >1~3 +15% -10%
    >3 +12.5% -10%


    Seamless Steel Pipe End 

    Plain End Wall Thickness less than 0.5 inch, including SCH STD & SCH XS
    Plain End (Square Cut) Wall Thickness over 0.5 inch, including SCH XXS
    Beveled End Wall Thickness less than 0.5 inch, including SCH STD & SCH XS 
    Couplings Outside Diameter equal or less than 2''
    Thread Protection Outside Diameter over 4 inch
    Key words:
    • Seamless Steel Pipe

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