1、Designation:A102803(Reapproved 2015)Standard Specification forStainless Steel Bars for Compressor and Turbine Airfoils1This standard is issued under the fixed designation A1028;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、 of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers stainless steel bars for com-pressor and turbine bucket,blade,and airfoil applications.1.2 Th
3、e values stated in inch-pound units are to be regardedas standard.No other units of measurement are included in thisstandard.2.Referenced Documents2.1 ASTM Standards:2A275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA484/A484M Specification for General Requirements forStainless
4、Steel Bars,Billets,and ForgingsA700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products for ShipmentA941 Terminology Relating to Steel,Stainless Steel,RelatedAlloys,and FerroalloysE112 Test Methods for Determining Average Grain SizeE292 Test Methods for Conducting Time-for-Rupture Notc
5、hTension Tests of MaterialsE381 Method of Macroetch Testing Steel Bars,Billets,Blooms,and ForgingsE562 Test Method for Determining Volume Fraction bySystematic Manual Point Count3.Terminology3.1 Refer to Terminology A941 for definitions of terms usedin this standard.4.Ordering Information4.1 It is t
6、he responsibility of the purchaser to specify allrequirements that are necessary for product under this specifi-cation.Such requirements to be considered may include but arenot limited to the following:4.1.1 Quantity(weight or number of pieces).4.1.2 Grade and Class(Table 3).4.1.3 Applicable dimensi
7、ons including size,thickness,width,and length.4.1.4 Whether bars are to be rolled as bars or cut from plate.4.1.5 Supplementary Requirements.5.General Requirements5.1 Product furnished to this specification shall conform tothe requirements of Specification A484/A484M including anysupplementary requi
8、rements that are indicated in the purchaseorder.Failure to comply with the general requirements ofSpecification A484/A484M constitutes nonconformance withthis specification.5.2 In case of conflict between the requirements of thisspecification and Specification A484/A484M,this specificationshall prev
9、ail.6.Manufacture6.1 Melting ProcessThe steel shall be made using theBasicElectricFurnaceProcesswithArgon-Oxygen-Decarburization(AOD)refining or by Vacuum Ladle Degas-sing.Use of Electro-Slag Remelting is permitted unless other-wisespecifiedbythepurchaser(seeSupplementalRequirement S1).6.2 Heat Trea
10、tmentHeat treating of all bars is required inaccordance with Table 1 to develop the required mechanicalproperties.6.2.1 Number of Heat TreatmentsTwo complete heattreatments,consisting of an austenitize,quench and temper,arepermitted.Purchaser approval is required prior to any addi-tional heat treatm
11、ents.6.2.2 Temperature VariationHeat treating temperaturesshall be controlled in the range of 625F.6.3 Stress ReliefWhen heat treatment for mechanicalproperties is followed by straightening,a stress relieving heattreatment is required in accordance with Table 1.6.3.1 Quenching after Stress ReliefWat
12、er or oil quenchingof stress-relieved bars is prohibited.7.Chemical Composition7.1 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 dire
13、ct responsibility of SubcommitteeA01.17 on Flat-Rolled and Wrought Stainless Steel.Current edition approved March 1,2015.Published March 2015.Originallyapproved in 2003.Last previous edition approved in 2009 as A1028 03(2009).DOI:10.1520/A1028-03R15.2For referenced ASTM standards,visit the ASTM webs
14、ite,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 8.Mech
15、anical Properties8.1 Lot SizeA lot shall consist of all bars of the same sizefrom one electric furnace heat of steel and heat treated,eitherin the same charge in either a batch furnace or a continuoustype furnace.8.2 Hardness TestsAll testing shall be performed afterheat treatment and stress relief,
16、as applicable.The test speci-mens shall meet the requirements of Table 3.8.2.1 Number of TestsA minimum of four bars or 10%ofthe lot,whichever is less,shall be tested on each end.8.3 Tensile and Impact TestsOne room temperature tensiletest and two room temperature Charpy V-Notch Impact testsshall be taken from the softest and hardest Bar in each lot ofmaterial.Impact tests are only required on bars or shapes12in.or larger in minor dimension.8.3.1 Test Specimen LocationThe axis of the specimensha