ASTM A403

STANDARD SPECIFICATION FOR WROUGHT AUSTENITIC STAINLESS STEEL PIPING FITTINGS

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 ASME 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). 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 A 351/A 351M, A 743/A 743M, and A 744/A 744M.

2. Referenced Documents
A351/A351M Specification for Castings, Austenitic, for Pressure-Containing Parts
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
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 Test Method for Liquid Penetrant Examination
A 5.4 Specification for Corrosion-Resisting Chromium and Chromium-Nickel Steel Covered Welding Electrodes
A 5.9 Specification for Corrosion-Resisting Chromium and Chromium-Nickel Steel Welding Rods and Bare Electrodes
ASME B16.11 Forged Steel Fittings, Socket Welding and Threaded
ASME B16.9 Factory-Made Wrought Steel Butt-Welding Fittings
MSS SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions
MSS SP-43 Standard Practice for Light Weight Stainless Steel Butt-Welding Fittings
MSS SP-79 Socket Welding Reducer Inserts
MSS SP-83 Steel Pipe Unions, Socket Welding and Threaded
MSS SP-95 Swage(d) Nipples and Bull Plugs
Section IX, Welding Qualifications
Section VIII Division I, Pressure Vessels
SNT-TC-1A (1984) Recommended Practice for Nondestructive Testing Personnel Qualification and Certification

Reference.. ASTM International