ASTM A758/A758M-00

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

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    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 B 16.9.

    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 RequiredWeld Seam Finish ()Radiography Required?
    30 normalize UW-35 no
    31 normalize UW-35 yes
    32 normalize UW-35 and ground flush yes
    40 normalize and temperUW-35 no
    41 normalize and temperUW-35 yes
    42 normalize and temperUW-35 and ground flush yes
    50 quench and temperUW-35 no
    51 quench and temperUW-35 yes
    52 quench and temperUW-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 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 nonconformance with the specification.


    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-00

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