ASTM A381 - 96(2012)

    Standard Specification for Metal-Arc-Welded Steel Pipe for Use With High-Pressure Transmission Systems

    Active Standard ASTM A381 | Developed by Subcommittee: A01.09

    Book of Standards Volume: 01.01

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    This specification covers metal-arc-welded steel pipe for use with high pressure transmission systems. The pipe is intended for fabrication of fittings and accessories for compressor or pump-station piping. The required chemical compositions for carbon steel, and the tensile properties of finished pipes are presented. Mechanical testing requirements namely transverse body tension test and transverse weld tension test shall be performed on each length of pipe from each lot of 100 lengths, and transverse guided-bend weld test cut from a length of pipe from each lot of 50 length, also hydrostatic test from each length of pipes shall be performed. A radiographic examination shall also be performed to ensure that the welding equipment is consistently producing the required quality.

    This abstract 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.

    1. Scope

    1.1 This specification covers straight seam, double-submerged-arc-welded steel pipe (Note 1) suitable for high-pressure service, 16 in. (406 mm) and larger in outside diameter, with wall thicknesses from 5/16 to 11/2 in. (7.9 to 38 mm). The pipe is intended for fabrication of fittings and accessories for compressor or pump-station piping. Pipe ordered to this specification shall be suitable for bending, flanging (vastoning), corrugating, and similar operations.

    Note 1A comprehensive listing of standardized pipe dimensions is contained in ANSI B36.10.
    Note 2The term “double welded” is commonly used in the gas and oil transmission industry, for which this pipe is primarily intended, to indicate welding with at least two weld passes, of which one is on the outside of the pipe and one on the inside. For some sizes of the pipe covered by this specification, it becomes expedient to use manual welding, in which case the provisions of Note 3 shall be followed.

    1.2 Nine classes of pipe, based on minimum yield point requirements, are covered as indicated in Table 1.

    TABLE 1 Tensile Requirements


    Yield Strength,
    min, psi (MPa)

    Tensile Strength,
    min, psi (MPa)

    Elongation in 2 in.
    (50.8 mm),
    min, %

    Y 35

    35 000 (240)

    60 000 (415)


    Y 42

    42 000 (290)

    60 000 (415)


    Y 46

    46 000 (316)

    63 000 (435)


    Y 48

    48 000 (330)

    62 000 (430)


    Y 50

    50 000 (345)

    64 000 (440)


    Y 52

    52 000 (360)

    66 000 (455)


    Y 56

    56 000 (385)

    71 000 (490)


    Y 60

    60 000 (415)

    75 000 (515)


    Y 65

    65 000 (450)

    77 000 (535)


    1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.4 The following caveat applies to the test methods portion, Sections 9 and 10, only. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A370 Test Methods and Definitions for Mechanical Testing of Steel Products

    A530/A530M Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe

    E30 Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron

    ASME Boiler and Pressure Vessel Code

    Section IX Welding Qualifications

    ICS Code

    ICS Number Code 23.040.10 (Iron and steel pipes)

    UNSPSC Code

    UNSPSC Code 40171601(Industrial welded carbon steel pipe)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/A0381-96R12

    Citation Format

    ASTM A381-96(2012), Standard Specification for Metal-Arc-Welded Steel Pipe for Use With High-Pressure Transmission Systems, ASTM International, West Conshohocken, PA, 2012,

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