ASTM_A_723_-_A_723M_-_10_2015.pdf

Designation:A723/A723M10(Reapproved 2015)Standard Specification forAlloy Steel Forgings for High-Strength Pressure ComponentApplication1This standard is issued under the fixed designation A723/A723M;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.1.Scope1.1 This specification2covers requirements for high-strength quenched and tempered alloy steel forgings for pres-sure vessels,isostatic presses,shock tubes,and similar com-ponents.1.2 These materials are not intended for welded construc-tion.1.3 Three grades of nickel-chromium-molybdenum steelsand six classes of increasing tensile strength are included.Thestrength class,section size,and configuration of the forgingwill largely dictate the applicable type(s)of steel.1.4 The values stated in either inch-pound units or SI(metric)units are to be regarded separately as the standard.Within the text and tables,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 noncon-formance with the specification.1.5 Unless the order specifies the applicable“M”specifica-tion designation,the material shall be furnished to the inch-pound units.2.Referenced Documents2.1 ASTM Standards:3A275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA388/A388M Practice for Ultrasonic Examination of SteelForgingsA788/A788M Specification for Steel Forgings,General Re-quirements2.2 Other Standards:ASME Boiler and Pressure Vessel Code43.Ordering Information and General Requirements3.1 In addition to the ordering information required bySpecification A788/A788M,the purchaser shall include withthe inquiry and order a detailed drawing,sketch,or writtendescription of the forging and the method of selecting testlocation(see 6.2).When appropriate,the areas of significantloading in the forging shall be designated.The purchaser mayalso include appropriate supplementary requirements fromSpecification A788/A788M as well as from this specification.3.2 Material supplied to this specification shall conform tothe requirements of Specification A788/A788M,which out-linesadditionalorderinginformation,manufacturingrequirements,testing and retesting methods and procedures,marking,certification,product analysis variations,and addi-tional supplementary requirements.3.3 If the requirements of this specification are in conflictwith the requirements of Specification A788/A788M,therequirements of this specification shall prevail.3.4 When forgings are required to be in compliance withDivision 3 of the ASME Boiler and Pressure Vessel Code,Supplementary Requirement S6 should be specified.4.Materials and Manufacture4.1 Melting PracticeThe steel melting procedures ofSpecification A788/A788M shall apply except that the open-hearth process shall not be used,and that the steel shall bevacuum degassed prior to or during the pouring of the ingot,inorder to remove objectionable gases,particularly hydrogen.4.1.1 Use of secondary remelting or refining operations maybe considered for particularly demanding applications.4.2 DiscardSufficient discard shall be taken from eachingot to secure freedom from piping and excessive segregation.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved March 1,2015.Published March 2015.Originallyapproved in 1975.Last previous edition approved in 2010 as A723/A723M 10.DOI:10.1520/A0723_A0723M-10R15.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA723/SA723M in Section II of that Code.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4Available from American Society of Mechanical Engineers(ASME),Two ParkAve.,New York,NY 10016-5990,http:/www.asme.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 States1 4.3 Heat Treatment:4.3.1 Forgings shall be rough-machined prior to final heattreatment if it is necessary to reduce the mass to ensure fullhardening or to meet the requirements of 6.2.The risk ofcracking during heat treatment with high-hardenability steelsof the type covered by this specification should be borne inmind when deciding on the degree of surface preparationbefore heat treatment.4.3.2 Heat Treatment for Mechanical P