ASTM A758 / A758M - 13

    Standard Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness

    Active Standard ASTM A758 / A758M | Developed by Subcommittee: A01.22

    Book of Standards Volume: 01.01


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    ASTM A758 / A758M

    Abstract

    This guide covers standard specification for wrought-carbon steel butt-welding seamless or welded fittings specially processed to ensure better notch toughness. Heat treatment shall be required for all types of fittings. Fittings with mandatory radiographic examination of welds shall be included. Cast fittings and fittings formed from all weld metal, shall not be included. Heat or cast analysis shall be conducted wherein the material shall conform to the required chemical components for carbon, manganese, phosphorus, sulfur, silicon, vanadium, chromium, nickel, molybdenum, copper, and lead. The fittings, as represented by tensile test specimens taken subsequent to final heat treatment, shall conform to the specified values of tensile strength, yield strength, and elongation for the applicable grades of steel. Mechanical tests such as tension test and transverse guided weld bend test shall be performed on the fittings.

    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 wrought-carbon steel butt-welding seamless or welded fittings specially processed to ensure better notch toughness than that to be expected in fittings manufactured to the requirements of Specification A234/A234M.

    1.1.1 Included are elbows, caps, tees, reducers, and other type fittings covered by ASME B16.9.

    1.1.2 Heat treatment is required for all fittings.

    1.1.3 Fittings with mandatory radiographic examination of welds are included.

    1.1.4 Supplementary requirements are provided for use when additional testing or examination is desired.

    1.1.5 Cast fittings, and fittings formed from all weld metal, are not included.

    1.2 Several type of fittings are provided, as follows:


    Type

    Heat Treatment
    Required

    Weld Seam
    Finish (5.3.2)

    Radiography
    Required?

     

    30

    normalize

    UW-35

    no

    31

    normalize

    UW-35

    yes

    32

    normalize

    UW-35 and ground flush

    yes

    40

    normalize and temper

    UW-35

    no

    41

    normalize and temper

    UW-35

    yes

    42

    normalize and temper

    UW-35 and ground flush

    yes

    50

    quench and temper

    UW-35

    no

    51

    quench and temper

    UW-35

    yes

    52

    quench and temper

    UW-35 and ground flush

    yes


    1.3 It shall be the responsibility of the purchaser to determine whether material meeting the requirements of this specification is satisfactory for the service application.

    1.4 This specification is expressed in both inch-pound units and SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.

    1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.


    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

    A234/A234M Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service

    A275/A275M Practice for Magnetic Particle Examination of Steel Forgings

    A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings

    E165 Practice for Liquid Penetrant Examination for General Industry

    E709 Guide for Magnetic Particle Testing

    ASME Boiler and Pressure Vessel Code (ASME Code)

    SectionIX , Welding and Brazing Qualifications

    SectionVIII,Division Pressure Vessels

    ASME Standard

    B16.9 Standards for Steel Butt-Welding Fittings


    ICS Code

    ICS Number Code 23.040.40 (Metal fittings)

    UNSPSC Code

    UNSPSC Code 40170000(Pipe piping and pipe fittings)


    DOI: 10.1520/A0758_A0758M

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