ASTM_A_289_-_A_289M_-_97_2013.pdf

Designation:A289/A289M97(Reapproved 2013)Standard Specification forAlloy Steel Forgings for Nonmagnetic Retaining Rings forGenerators1This standard is issued under the fixed designation A289/A289M;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 nonmagnetic alloy steel retain-ing ring forgings for generators.1.2 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.1.3 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:2A342/A342M Test Methods for Permeability of FeeblyMagnetic MaterialsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA531/A531M Practice for Ultrasonic Examination ofTurbine-Generator Steel Retaining RingsA788/A788M Specification for Steel Forgings,General Re-quirementsE45 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 Material supplied to this specification shall conform tothe requirements of Specification A788/A788M,which out-lines ordering information,manufacturing requirements,test-ing methods and retesting procedures,marking,certification,product analysis variation,and additional supplementary re-quirements.3.2 If the requirements of this specification are in conflictwith the requirements of Specification A788/A788M,therequirements of this specification shall prevail.3.3 Supplementary requirements of an optional nature areprovided.They shall apply only when specified by the pur-chaser.4.Manufacture4.1 The steel shall be made by the electro-slag-remelt(ESR)process.The electrodes shall be made by either the basicelectric furnace or ladle refining processes.4.2 Sufficient discard shall be taken from each ingot tosecure freedom from piping and undue segregation.4.3 Forged rings shall be solution treated following hotworking and prior to the cold expansion procedure.4.4 Rings shall be rough machined prior to cold expansionor final heat treatment.4.5 Rings shall be expanded by an appropriate method suchas segmented dies,tapered plug,etc.in the temperature rangeof 60 to 390F 15 to 200C in order to develop the requiredtensile properties.4.6 After cold expansion,the rings shall be heated tobetween 575 and 750F 300 to 400C at a rate not to exceed75F 40C/h,held at this temperature for 6 to 12 h,and thenslow cooled to ambient temperature.5.Chemical Requirements5.1 Heat AnalysisThe heat analysis obtained from sam-pling in accordance with Specification A788/A788M shallcomply with Table 1 of this specification.5.2 Product AnalysisWhen a product analysis is per-formed at the request of the purchaser,the provisions of Table1 of Specification A788/A788M shall apply.The analysis shallbe made from a forging representing each heat.NOTE1The material shown in Table 1 of A289/A289M was formerlyknown as Class C.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 May 15,2013.Published May 2013.Originallyapproved in 1946.Last previous edition approved in 2008 as A289/A289M 97(2008).DOI:10.1520/A0289_A0289M-97R13.2For 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 States1 6.Mechanical Properties6.1 The rings shall conform to the tensile properties for theordered grade listed in Table 2.The largest obtainable tensiontest specimen as specified in Test Methods and DefinitionsA370 shall be used.6.2 Unless Supplementary Requirement S2 is invoked,ten-sion tests shall be performed in the temperature range of 68 to80F 20 to 27C.The yield strength at 0.2%offset shall notexceed the tensile strength.6.3 Rings shall conform to the Charpy V-notch requirementsof Table 2 corresponding to the ordered strength grade whentested in the temperature range specified in 6.2.7.Electrical Properties7.1 The permeability of the forgings at a magnetizing forceof 100 oersteds shall not exceed 1.5.Test bars and testing shallbe in accordance with Test Meth