ASTM_A_485_-_14.pdf

Designation:A48514Standard Specification forHigh Hardenability Antifriction Bearing Steel1This standard is issued under the fixed designation A485;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers high hardenability modifica-tions of high-carbon bearing quality steel to be used in themanufacture of antifriction bearings.1.2 Supplementary requirements of an optional nature areprovided and when desired shall be so stated in the order.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standards:2A29/A29M Specification for General Requirements for SteelBars,Carbon and Alloy,Hot-WroughtA255 Test Methods for Determining Hardenability of SteelA751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsE45 Test Methods for Determining the Inclusion Content ofSteelE381 Method of Macroetch Testing Steel Bars,Billets,Blooms,and ForgingsE1019 Test Methods for Determination of Carbon,Sulfur,Nitrogen,and Oxygen in Steel,Iron,Nickel,and CobaltAlloys by Various Combustion and Fusion TechniquesE1077 Test Methods for Estimating the Depth of Decarbur-ization of Steel Specimens2.2 Other Standards:SAE J148a Grain Size Determination of Steel3ISO 683 Part 17:Ball and Roller Bearing Steels43.Ordering Information3.1 Orders for material under this specification shouldinclude the following information:3.1.1 Quantity(weight or number of pieces),3.1.2 Grade identification,3.1.3 ASTM designation and year of issue,3.1.4 Dimensions,3.1.5 Supplementary requirements,if included.4.Process4.1 The steel shall be made by a process that is capable ofproviding a high quality product meeting the requirements ofthis specification.5.Chemical Composition and Analysis5.1 Typical examples of chemical compositions are shownin Table 1.Other compositions may be specified.5.2 An analysis of each heat of steel shall be made by thesteel manufacturer in accordance with Test Methods,Practices,and Terminology A751.The chemical composition thus deter-mined shall conform to the requirements specified in Table 1for the ordered grade or to other requirements agreed uponbetween manufacturer and purchaser.5.3 Product analysis may be made by the purchaser inaccordance with Test Methods,Practices,and TerminologyA751.Permissible variations in product analysis shall be inaccordance with Specification A29/A29M.6.Sizes,Shapes,and Dimensional Tolerances6.1 The physical size and shape of the material shall beagreed upon between manufacturer and purchaser.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys,and is the direct responsibility of SubcommitteeA01.28 on Bearing Steels.Current edition approved Oct.1,2014.Published November 2014.Originallyapproved in 1963.Last previous edition approved in 2009 as A485 09.DOI:10.1520/A0485-14.2For 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.3Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.4Available from International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,CP 56,CH-1211 Geneva 20,Switzerland,http:/www.iso.org.*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 6.2 Dimensional tolerances for hot-rolled or hot-rolled andannealed bars,in straight lengths or coils,and cold-finishedbars furnished under this specification shall conform to therequirements specified in the latest edition of SpecificationA29/A29M.7.Quality Tests7.1 The supplier shall be held responsible for the quality ofthe material furnished and shall make the necessary tests toensure this quality.The supplier shall be required to report onthe results of the micro-inclusion rating tests detailed below.Quality tests shown in 7.1 through 7.3 are based uponprocedures established in Test Methods E45.7.2 SamplingSamples taken in accordance with the fol-lowing paragraphs shall be obtained from 4 by 4 in.(102 by102 mm)rolled billets or forged sections.Tests may be madeon smaller or larger sections by agreement with the purchaser.A minimum of 3 to 1 reduction of rolled billets or forgedsections is required for strand cast products.7.2.1 For top poured products,a minimum of six