ASTM A403/A403M-00b

    Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings

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    1. Scope

    1.1 This specification covers wrought stainless steel fittings for pressure piping applications.

    1.2 Several grades of austenitic stainless steel alloys are included in this specification Grades are designated with a prefix, WP or CR, based on the applicable ANSI or MSS dimensional and rating standards, respectively.

    1.3 For each of the WP stainless grades, several classes of fittings are covered, to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination (NDE). Table 1 is a general summary of the fitting classes applicable to all WP grades of stainless steel covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere.

    1.4 This specification is expressed in both inch-pound units and in 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.

    1.6 This specification does not apply to cast steel fittings. Austenitic stainless steel castings are covered in Specifications A351/A351M, A743/A743M, and A744/A744M.


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

    MSS Standards: 

    MSSSP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions

    MSSSP-43 Standard Practice for Light Weight Stainless Steel Butt-Welding Fittings

    MSSSP-79 Socket-Welding Reducer Inserts

    MSSSP-83 Steel Pipe Unions, Socket-Welding and Threaded

    MSSSP-95 Swage(d) Nipples and Bull Plugs

    MSSSP-97 Integrally Reinforced Forged Branch Outlet Fittings--Socket Welding, Threaded and Buttwelding Ends

    ASTM Standards

    A351/A351M Specification for Castings, Austenitic, for Pressure-Containing Parts

    A743/A743M Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application

    A744/A744M Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service

    A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

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

    E112 Test Methods for Determining Average Grain Size

    E165 Practice for Liquid Penetrant Examination for General Industry

    ASME Standards: 

    ASMEB16.11 Forged Steel Fittings, Socket-Welding and Threaded

    ASMEB16.9 Factory-Made Wrought Steel Butt-Welding Fittings

    ASME Boiler and Pressure Vessel Code: 

    SectionIX, Welding Qualifications

    SectionVIIIDivisionI Pressure Vessels

    AWS Standards: 

    A5.11 Specification for Nickel and Nickel-Alloy Welding Electrodes for Shielded Metal Arc Welding

    A5.14 Specification for Nickel and Nickel-Alloy Bare Welding Rods and Electrodes

    A5.4 Specification for Corrosion-Resisting Chromium and Chromium-Nickel Steel Covered Welding Electrodes

    A5.9 Specification for Corrosion-Resisting Chromium and Chromium-Nickel Steel Welding Rods and Bare Electrodes


    ICS Code

    ICS Number Code 23.040.40 (Metal fittings)

    UNSPSC Code

    UNSPSC Code 40170000(Pipe piping and pipe fittings)


    DOI: 10.1520/A0403_A0403M-00B

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