Designation: A350/A350M − 24bStandard Specif i cation forCarbon and Low-Alloy Steel Forgings, Requiring NotchToughness Testing for Piping Components 1This standard is issued under the f i xed designation A350/A350M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specif i cation 2 covers several grades of carbon andlow-alloy steel forged or ring-rolled f l anges, forged f i ttings andvalves intended primarily for low-temperature service andrequiring notch toughness testing. They are made to specif i eddimensions, or to dimensional standards, such as the ASMEand API Specif i cations referenced in Section 2. Although thisspecif i cation covers some piping components machined fromrolled bar and seamless tubular materials (see 5.3.3), it does notcover raw material produced in these product forms.1.2 No limitation on size is intended beyond the ability ofthe manufacturer to obtain the specif i ed requirements.However, Class 3 of Grade LF787 is only available in thequenched-and-precipitation heat treated condition.1.3 Supplementary requirements are provided for use whenadditional testing or inspection is desired. These shall applyonly when specif i ed by the purchaser in the order.1.4 This specif i cation is expressed in both inch-pound unitsand in SI units. However, unless the order specif i es theapplicable “M” specif i cation designation (SI units), the mate-rial shall be furnished to inch-pound units.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem may not be exact equivalents; therefore, each systemshall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with thestandard.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 3A788/A788M Specif i cation for Steel Forgings, General Re-quirementsA961/A961M Specif i cation for Common Requirements forSteel Flanges, Forged Fittings, Valves, and Parts forPiping Applications2.2 ASME Standards:B 16.5 Steel Pipe Flanges and Flanged Fittings 4B 16.9 Factory-Made Wrought Steel Butt-Welding Fittings 4B 16.10 Face-to-Face and End-to-End Dimensions of Fer-rous Valves 4B 16.11 Forged Steel Fittings, Socket-Welding andThreaded 4B 16.30 Unf i red Pressure Vessel Flange Dimensions 4B 16.34 Valves-Flanged, Threaded, and Welding End 4B 16.47 Large Diameter Steel Flanges 42.3 ASME Boiler and Pressure Vessel Code:Section IX 22.4 AWS Standards:A 5.1 Mild Steel Covered Arc-Welding Electrodes 5A 5.5 Low-Alloy Steel Covered Arc-Welding Electrodes 52.5 API Standards: 6600 Steel Gate Valves with Flanged or Butt-Welding Ends602 Compact Design Carbon Steel Gate Valves for Ref i neryUse605 Large Diameter Carbon Steel Flanges1 This specif i cation is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.22 on Steel Forgings and Wrought Fittings for Piping Applications and BoltingMaterials for Piping and Special Purpose Applications.Current edition approved Oct. 15, 2024. Published November 2024. Originallyapproved in 1952. Last previous edition approved in 2024 as A350/A350M – 24a.DOI: 10.1520/A0350_A0350M-24B.2 For ASME Boiler and Pressure Vessel Code applications see related Specif i -cation SA-350 in Section II of that Code.3 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.4 Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Two Park Ave., New York, NY 10016-5990, http://www.asme.org.5 Available from American Welding Society (AWS), 550 NW LeJeune Rd.,Miami, FL 33126, http://www.aws.org.6 Available from American Petroleum Institute (API), 1220 L. St., NW,Washington, DC 20005-4070, http://api-ec.api.org.*A Summary of Changes section appears at the end of this standardCopyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1
