1、Designation:A729/A729M151Standard Specification forCarbon and Alloy Steel Axles,Heat-Treated,for Mass Transitand Electric Railway Service1This standard is issued under the fixed designation A729/A729M;the number immediately following the designation indicates the yearof original adoption or,in the c
2、ase 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.1NOTEFigs.1 and 2 were corrected editorially in December 2015.1.Scope*1.1 This specification covers heat-
3、treated carbon and alloysteel axles for mass transit and commuter cars in electric andlocomotive hauled railway service.1.2 This specification is for solid design roller bearing axleswith machined bodies.1.3 Various axle designs are used for this service includingmotor and non-motor with either inbo
4、ard or outboard journals.1.4 Supplementary requirements including those in the gen-eral requirements of Specification A788/A788M are providedfor use when additional testing or inspection is desired.Theseshall apply only when specified individually by the purchaserin the order.1.5 Unless the order sp
5、ecifies the applicable“M”specifica-tion designation,the axles shall be furnished to the inch-poundunits.1.6 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 use
6、d independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.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
7、fSteel ForgingsA388/A388M Practice for Ultrasonic Examination of SteelForgingsA788/A788M Specification for Steel Forgings,General Re-quirementsE112 Test Methods for Determining Average Grain SizeE381 Method of Macroetch Testing Steel Bars,Billets,Blooms,and ForgingsE1426 Test Method for Determining
8、the X-Ray ElasticConstants for Use in the Measurement of Residual StressUsing X-Ray Diffraction Techniques2.2 Other Standards:3AAR Manual of Standards and Recommended Prac-tices Wheels and Axles3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 classthe set of chemical requirement
9、s for the steel tobe used for the axles to be supplied.3.1.2 gradethe designation of the specific set of mechani-cal properties selected for the axle(s)to be supplied.The gradeis selected based on the axle design and service requirements.3.2 Users of this specification are cautioned that the abovete
10、rms may be used differently in other industry standards andpurchaser ordering information.Producers and purchasersshould ensure that both parties are in agreement regarding thespecific mechanical and chemical requirements for the axles tobe supplied.4.Ordering Information4.1 Material supplied to thi
11、s specification shall conform tothe requirements of Specification A788/A788M,which out-lines ordering information,manufacturing requirements,test-ingandretestingmethodsandprocedures,marking,certification,product analysis variations,and additional supple-mentary requirements.4.1.1 If the requirements
12、 of this specification are in conflictwith the requirements of Specification A788/A788M,then therequirements of this specification shall prevail.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of Subcomm
13、itteeA01.06 on Steel Forgings and Billets.Current edition approved May 15,2015.Published June 2015.Originallyapproved in 1976.Last previous edition approved in 2014 as A729/A729M 09(2014).DOI:10.1520/A0729_A0729M-15E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM
14、 Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Association of American Railroads(AAR),425 Third St.,SW,Washington,DC 20024,http:/www.aar.org.*A Summary of Changes section appears
15、 at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 In addition to the ordering information required bySpecification A788/A788M,the purchaser should include withthe inquiry and order a detailed drawing,sketch o
16、r writtendescription of the axle showing complete details pertaining todimensions,tolerances if more restrictive than those containedin this specification,degree of finish,and location of stamping.4.2.1 Unless the purchaser designates a class in the purchaseorder or contract,the class used shall be at the producersdiscretion.4.3 Supplementary requirements,if needed,including anythat are appropriate from Specification A788/A788M.5.Chemical Requirements5.1 Chemical CompositionThe steel shall confo
