ASTM_A_469_-_A_469M_-_07_2017.pdf

Designation:A469/A469M07(Reapproved 2017)Standard Specification forVacuum-Treated Steel Forgings for Generator Rotors1This standard is issued under the fixed designation A469/A469M;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 specification covers vacuum-treated basic electricsteel forgings for generator rotors.1.2 Supplementary requirements are provided,both in thisstandard and in Specification A788/A788M,for use whenadditional testing,inspection or processing is required by thepurchaser.1.3 The values stated in either inch-pound or SI(metric)units are to be regarded separately as standards.Within the textand tables,the SI units are shown in brackets.The values statedin each system are not exact equivalents;therefore,eachsystem must be used independent of the other.Combiningvalues from the two systems may result in nonconformancewith the specification.1.4 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:2A275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA341/A341M Test Method for Direct Current MagneticProperties of Soft Magnetic Materials Using D-C Per-meameters and the Point by Point(Ballistic)Test MethodsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA418/A418M Practice for Ultrasonic Examination of Tur-bine and Generator Steel Rotor ForgingsA773/A773M Test Method for Direct Current MagneticProperties of Low Coercivity Magnetic Materials UsingHysteresigraphsA788/A788M Specification for Steel Forgings,General Re-quirements3.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 dimensioned drawing showing themechanical test specimen locations,together with:3.1.1 Details of any required magnetic permeability tests(6.1).3.1.2 If the yield strength is to be determined at an offset of0.2%(Table 1),and number of tests(7.1.2 and 7.1.3).3.1.3 If vertical heat treatment is required(SupplementaryRequirement S3).3.1.4 If heat treatment by normalizing and tempering isrequired(4.2.2 and 4.2.3).3.1.5 If post rough machining stress relief may be omittedfor forgings that have been double tempered(4.2.2).3.1.6 Details for boring including dimensions,finish,timingand additional testing if required(8.3 and SupplementaryRequirement S1).3.1.7 Any applicable instructions regarding the requirednondestructive examinations(8).3.1.8 If vacuum arc remelted ingots are to be used,thepurchaser may require that footnote A to Table 2 be applicable.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,production analysis variations,and ad-ditional supplementary requirements.3.3 Failure to comply with the applicable general require-ments of Specification A788/A788M constitutes nonconfor-mance with this specification.3.4 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 vacuum degassing requirements of SpecificationA788/A788M are mandatory.4.1.1 Other vacuum methods of degassing may be used ifthe supplier can demonstrate their adequacy to the satisfactionof the purchaser,but in this case,hydrogen testing perSupplementary Requirement S4 is mandatory.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 15,2017.Published March 2017.Originallyapproved in 1962.Last previous edition approved in 2012 as A469/A469M 07(2012).DOI:10.1520/A0469_A0469M-07R17.2For 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.Copyright 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 4.2 Heat Treatment:4.2.1 Vertical heat treatment of the rotor forging ispreferred,and Supplementary Requi