ASTM_A_579_-_A_579M_-_17.pdf

Designation:A579/A579M17Standard Specification forSuperstrength Alloy Steel Forgings1This standard is issued under the fixed designation A579/A579M;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.Scope*1.1 This specification covers requirements for forged steelshapes for highly stressed structural members requiring yieldstrengths in excess of 140 ksi 965 MPa.1.2 This specification is not intended for applications lim-ited by creep deformation.1.3 Twenty-eight grades are covered by this specification.Selection will depend upon design,service conditions,andmechanical properties required.1.4 Supplementary requirements are provided for use whenadditional testing or inspection is desired.These shall applyonly when specified individually by the purchaser in the order.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.6 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:2A255 Test Methods for Determining Hardenability of SteelA275/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-quirementsE3 Guide for Preparation of Metallographic SpecimensE21 Test Methods for Elevated Temperature Tension Tests ofMetallic MaterialsE45 Test Methods for Determining the Inclusion Content ofSteelE112 Test Methods for Determining Average Grain SizeE165/E165M Practice for Liquid Penetrant Examination forGeneral Industry3.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.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.4.Materials and Manufacture4.1 The steel shall be made in accordance with the MeltingProcess Section of Specification A788/A788M.A sufficientdiscard shall be made to secure freedom from injurious pipeand undue segregation.4.2 The material shall be forged as close as practical to thespecified shape and size.4.3 The finished product shall be a hot-worked forging asdefined by Specification A788/A788M.4.4 Heat Treatment Performed by Forging SupplierForgings may be furnished in one of the following conditionsas specified in the inquiry and purchase order(some conditionsare not applicable to all grades):4.4.1 Stress relieved,4.4.2 Annealed,4.4.3 Solution treated,4.4.4 Solution treated and aged,4.4.5 Normalized,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 Feb.1,2017.Published February 2017.Originallyapproved in 1967.Last previous edition approved in 2014 as A579/A579M 04a(2014).DOI:10.1520/A0579_A0579M-17.2For 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.*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 4.4.6 Normalized and tempered,or4.4.7 Quenched and tempered.4.5 Heat Treatment Performed by PurchaserWhen finalheat treatment is to be performed by the purchaser aftermachining or fabrication,or both,a capability heat treatmentduplicating the purchasers final heat treatment must be per-formed by the supplier on representat