ASTM_A_756_-_09_2014e1.pdf

Designation:A75609(Reapproved 2014)1Standard Specification forStainless Anti-Friction Bearing Steel1This standard is issued under the fixed designation A756;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.1NOTETable 1 was editorially corrected in October 2015.1.Scope1.1 Thisspecificationcoverstherequirementsforchromium-carbon bearing quality stainless steel to be used inthe manufacture of anti-friction 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:2A484/A484M Specification for General Requirements forStainless Steel Bars,Billets,and ForgingsA751 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:ISO 683 Part 17 Ball and Roller Bearing Steels3SAE J418a Grain Size Determination of Steel43.Ordering Information3.1 Orders for material under specification should includethe following information:3.1.1 Quantity,3.1.2 Grade identification,3.1.3 Specification designation and year of issue,3.1.4 Dimensions,shape,and3.1.5 Supplementary Requirements,if desired.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 Composition5.1 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 requirements agreed upon betweenthe manufacturer and the 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 madein accordance with Specification A484/A484M.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 October 2014.Originallyapproved in 1978.Last previous edition approved in 2009 as A756 09.DOI:10.1520/A0756-09R14E01.2For 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 International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,CP 56,CH-1211 Geneva 20,Switzerland,http:/www.iso.org.4Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Dimensions,Mass,and Permissible Variations6.1 The size and shape of the material shall be agreed uponbetween manufacturer and purchaser.6.2 Dimensional tolerances for hot-rolled or hot-rolled andannealed bars,in straight lengths or coils,and cold-finishedbars 0.500 in.(12.7 mm)and larger in diameter furnished underthis specification shall conform to the requirements specified inthe latest edition of Specification A484/A484M.6.3 Dimensional tolerances for cold-finished coils for balland roller material shall be as shown in Table 2.6.4 Coil tolerances also apply to cold-finished straightlengths under 0.500 in.(12.7 mm)in diameter.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 macroetch and microinclusion rating testsdetailed below.Quality tests shown in 7.2 through 7.4 arebased upon procedures 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 3 to 1 reduction of rolled billets or forg