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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 (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
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 Number Code 23.040.40 (Metal fittings)
UNSPSC Code 40170000(Pipe piping and pipe fittings)
ASTM A403 / A403M-06, Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings, ASTM International, West Conshohocken, PA, 2006, www.astm.orgBack to Top