ASTM_A_982_-_A_982M_-_10_2015.pdf

Designation:A982/A982M10(Reapproved 2015)Standard Specification forSteel Forgings,Stainless,for Compressor and TurbineAirfoils1This standard is issued under the fixed designation A982/A982M;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 stainless steel forgings forcompressor and turbine bucket,blade,and airfoil applications.1.2 This specification is expressed in both inch-pound unitsand in SI units;however,unless the purchase order or contractspecifies the applicable M designation(SI units),the inch-pound units shall apply.The values stated in either inch-poundunits or SI units are to be regarded separately as standard.Within the text,the SI units are shown in brackets.The valuesstated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combin-ing values from the two systems may result in nonconformancewith the standard.2.Referenced Documents2.1 ASTM Standards:2A275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA788/A788M Specification for Steel Forgings,General Re-quirementsE112 Test Methods for Determining Average Grain SizeE292 Test Methods for Conducting Time-for-Rupture NotchTension Tests of MaterialsE381 Method of Macroetch Testing Steel Bars,Billets,Blooms,and ForgingsE562 Test Method for Determining Volume Fraction bySystematic Manual Point Count3.Ordering Information3.1 In addition to the ordering information required bySpecification A788/A788M,the purchaser shall include asketch or written description of the forging with the inquiry andorder.4.General Requirements4.1 Materials 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.4.2 If the requirements of this specification are in conflictwith the requirements of Specification A788/A788M,therequirements of this specification shall prevail.5.Manufacture5.1 Melting ProcessAll melting processes of SpecificationA788/A788M are permitted unless Supplementary Require-ment S1 is invoked by the purchaser.5.2 Forging ProcessEither the closed impression die orthe open die forging processes may be utilized unless thepurchaser specifies one or the other.5.2.1 Forging TemperatureThe maximum part tempera-ture during forging shall be 2150F 1175C.5.3 Heat TreatmentHeat treating all forgings is required inaccordance with Table 1 to develop the required mechanicalproperties.5.3.1 Number of Heat TreatmentsTwo complete heattreatments,consisting of an austenitize,quench,and temper,are permitted.Purchaser approval is required prior to anyadditional heat treatments.5.3.2 Temperature VariationHeat treating temperaturesshall be controlled in the range of 625F 614C.5.4 Stress ReliefWhen heat treatment for mechanicalproperties is followed by straightening,a stress-relieving heattreatment is required at a temperature meeting the requirementsof Table 1.5.4.1 Quenching after Stress ReliefWater or oil quenchingof stress-relieved forgings is prohibited.6.Chemical Composition6.1 The steel shall conform to the requirements for chemicalcomposition prescribed in Table 2.1This 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.Originallypublished in 1998.Last previous edition approved in 2010 as A982/A982M 10.DOI:10.1520/A0982_A0982M-10R15.2For 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 States1 7.Mechanical Properties7.1 Tension,Impact,and Hardness TestsAll testing shallbe performed after heat treatment and stress relief,as appli-cable.The test specimens shall meet the requirements of Table3.7.1.1 Number of TestsA minimum of two forgings fromeach lot shall be randomly selected for longitudinal tensile,impact,and hardness testing.Hardness values of the tensiontest specimen shall be reported with the tensile data.7.1.1.1 Lot SizeA lot shall consist of all forgings of thesame size from one electric furnace heat of steel and heattreated either in the same charge in either a batch furnace or acontinuous type furnace.7.1.1.2 Continuous Heat Treating Furna