1、Designation:A1021/A1021M05(Reapproved 2015)Standard Specification forMartensitic Stainless Steel Forgings and Forging Stock forHigh-Temperature Service1This standard is issued under the fixed designation A1021/A1021M;the number immediately following the designation indicates theyear of original adop
2、tion or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers martensitic chromium stainlesssteel forgings,forged b
3、ar,and forging stock for high tempera-ture service.The mechanical properties are developed bysuitable heat treatment,as indicated for each alloy.1.2 This specification is expressed in both inch-pound unitsand in SI units;however,unless the purchase order or contractspecifies the applicable M specifi
4、cation designation(SI units),the inch-pound units shall apply.The values stated in eitherinch-pound units or SI units are to be regarded separately asstandard.Within the text,the SI units are shown in brackets.The values stated in each system may not be exact equivalents;therefore,each system shall
5、be used independently of the other.Combining values from the two systems may result in noncon-formance with the standard.1.3 Supplementary requirements of an optional nature areprovided for use at the option of the purchaser.The supple-mentary requirements shall apply only when specified indi-vidual
6、ly by the purchaser in the purchase order or contract.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of
7、regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA788/A788M Specification for Steel Forgings,General Re-quirementsE112 Test Meth
8、ods 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 a
9、ddition to the ordering information required bySpecification A788/A788M,the purchaser shall specify thegrade designation,heat treatment condition,class and finish,and include a sketch or written description of the forging withthe inquiry and order.4.General Requirements4.1 Materials supplied to this
10、 specification shall conform tothe requirements of Specification A788/A788M,including anysupplementary requirements that are indicated in the purchaseorder.Failure to comply with the general requirements ofSpecification A788/A788M constitutes non-conformance withthis specification.In case of conflic
11、t between the requirementsof this specification and Specification A788/A788M,thisspecification shall prevail.5.Manufacture5.1 Melting ProcessAll melting processes of SpecificationA788/A788M are permitted unless the purchaser invokesSupplementary Requirement S1.5.2 Forging ProcessEither the closed im
12、pression die orthe open die,including ring rolling,forging processes may beutilized unless the purchaser specifies a process.5.3 Heat TreatmentQuenched and tempered classes shallbe heat-treated in accordance with Table 1.5.3.1 Number of Heat TreatmentsHeat treatment as de-fined in Table 1 shall cons
13、ist of austenitizing,quenching,andtempering.Retempering is permitted but purchaser approval isrequired for more than one complete reheat treatment.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of Subco
14、mmitteeA01.06 on Steel Forgings and Billets.Current edition approved March 1,2015.Published March 2015.Originallyapproved in 2001.Last previous edition approved in 2010 as A1021/A1021M 05(2010).DOI:10.1520/A1021_A1021M-05R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontac
15、t 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 5.4 Stress ReliefWhen heat trea
16、tment for mechanicalproperties is followed by straightening,a stress-relieving heattreatment is required in accordance with Table 1.5.4.1 Quenching after Stress ReliefLiquid quenching ofstress-relieved forgings is prohibited.5.5 FinishForgings may be furnished in one of the fol-lowing hot-finished conditions:5.5.1 Finish FAs forged without descaling.5.5.2 Finish FDForged and descaled.5.5.3 Finish RTRough turned or rough machined to speci-fied dimensions.Billets or blooms ordered as forging stock
