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

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

          1. SCOPE

          1.1 This specification2 covers wrought carbon steel and alloy steel fittings of seamless and welded construction covered by the latest revision of ASME B16.9, B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, and MSS-SP-97. These fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures. Fittings differing from these ASME and MSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M.

          1.2 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. When desired, one or more of these supplementary requirements may be specified in the order.

          1.3 This specification does not cover cast welding fittings or fittings machined from castings. Cast steel welding fittings are

          governed by Specifications A216/A216M and A217/A217M.

          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 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

          2.1 In addition to those reference documents listed in Specification A960/A960M, the following list of standards apply to this specification.

          2.2 ASTM Standards:3

          A216/A216M Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service

          A217/A217M Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service

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

          2.3 ASME Standards:4

          B16.9 Steel Butt-Welding Fittings

          B16.11 Forged Steel Fittings, SocketWelding and Threaded

          2.4 ASME Boiler and Pressure Vessel Code:4

          Section V Nondestructive Examination

          Section VIII, Division 1, Pressure Vessels

          Section IX Welding Qualifications

          2.5 MSS Standards:5

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

          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

          MSS-SP-97 Integrally Reinforced Forged Branch Outlet Fittings—Socket Welding, Threaded and Butt welding Ends

          2.6 ASNT Standard:6

          SNT-TC-1A Recommended Practice for Nondestructive Testing Personnel Qualification and Certification

          2.7 AWS Specifications7

          A5.5/A5.5M Specification for Low-Alloy Steel Electrodes for Shielded Metal Arc Welding

          A5.23/A5.23M Specification for Low-Alloy Steel Electrodes and Fluxes for Submerged Arc Welding

          A5.28/A5.28M Specification for Low-Alloy Steel Electrodes for Gas Shielded Arc Welding

          A5.29/A5.29M Low-Alloy Steel Electrodes for Flux Cored Arc Welding

          3.Ordering Information

          3.1 See Specification A960/A960M.

          Research use only,Commercial use is prohibited.

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