1、Designation:A521/A521M06(Reapproved 2016)Standard Specification forSteel,Closed-Impression Die Forgings for General IndustrialUse1This standard is issued under the fixed designation A521/A521M;the number immediately following the designation indicates the yearof original adoption or,in the case of r
2、evision,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.Scope*1.1 This specification covers untreated and heat-treatedsteel,closed-impression die forgings(Note 1)for g
3、eneralindustrial use.NOTE1For the definition of a forging,refer General RequirementsSpecification A788/A788M.1.2 The Grades of forgings are as follows,the choicedepending on design and stress or service to be imposed:1.2.1 Grade CAUntreated,carbon steel forgings,1.2.2 Grades CC,CC1,and CEAnnealed,no
4、rmalized andtempered,carbon steel forgings,1.2.3 Grade CFNormalized and tempered carbon steelforgings,1.2.4 Grade CF1Double normalized and tempered carbonsteel forgings,1.2.5 Grade CGQuenched and tempered,or normalized,quenched and tempered carbon steel forgings,1.2.6 Grade AAAnnealed,normalized,or
5、normalized andtempered alloy steel forgings,1.2.7 Grades AB and ACNormalized and tempered alloysteel forgings,and1.2.8 Grades AD,AE,AF,AG,and AHNormalized,quenched,and tempered alloy steel forgings.1.3 Unless the order specifies the applicable“M”specifica-tion designation,the forgings shall be furni
6、shed with theinch-pound units.1.4 The values stated in either inch-pound units or SI(metric)units are to be regarded separately as standard.Withinthe text and tables,the SI units are shown in brackets.Thevalues stated in each system are not exact equivalents;therefore,each system shall be used indep
7、endently of the other.Combining values from the two systems may result in noncon-formance with the specification.2.Referenced Documents2.1 ASTM Standards:2A29/A29M Specification for General Requirements for SteelBars,Carbon and Alloy,Hot-WroughtA275/A275M Practice for Magnetic Particle Examination o
8、fSteel ForgingsA322 Specification for Steel Bars,Alloy,Standard GradesA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA388/A388M Practice for Ultrasonic Examination of SteelForgingsA576 Specification for Steel Bars,Carbon,Hot-Wrought,Special QualityA788/A788M Specification f
9、or Steel Forgings,General Re-quirementsA921/A921M Specification for Steel Bars,Microalloy,Hot-Wrought,Special Quality,for Subsequent Hot ForgingE3 Guide for Preparation of Metallographic SpecimensE45 Test Methods for Determining the Inclusion Content ofSteelE94 Guide for Radiographic ExaminationE112
10、 Test Methods for Determining Average Grain SizeE340 Practice for Macroetching Metals and AlloysE381 Method of Macroetch Testing Steel Bars,Billets,Blooms,and ForgingsE407 Practice for Microetching Metals and Alloys3.Ordering Information and General Requirements3.1 Material supplied to this specific
11、ation shall conform tothe requirements of Specification A788/A788M,which out-linesadditionalorderinginformation,manufacturingrequirements,testing and retesting methods and procedures,product analysis variations,marking,certification,and addi-tional supplementary requirements.Failure to comply with t
12、herequirements of Specification A788/A788M constitutes non-conformance with this specification.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
13、edition approved March 1,2016.Published April 2016.Originallyapproved in 1964.Last previous edition approved in 2011 as A521/A521M 06(2011).DOI:10.1520/A0521_A0521M-06R16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual
14、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 3.2 In addition to t
15、he ordering information required bySpecification A788/A788M,the purchaser may require that thetolerances stated in the appendices to this specification shallapply.3.3 If the requirements of this specification should conflictwith the requirements of Specification A788/A788M,then therequirements of th
16、is specification shall prevail.4.Forging Manufacture4.1 Sufficient discard shall be taken from the ingot orforging stock to secure freedom from piping and unduesegregation.4.2 Manufacturing practice shall be in accordance withaccepted commercial procedures designed to produce forgingsfree from harmful surface discontinuities,roughness,excessivescale,fins,indications of overheating,burning,or other inju-rious conditions.The manufacturer may be required to certifythat furnaces used for all heating