1、Designation:B43918Standard Specification forIron-Base Powder Metallurgy(PM)Bearings(Oil-Impregnated)1This standard is issued under the fixed designation B439;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 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 the requirements for porou
3、siron-base metallic sleeve,flange,thrust,and spherical bearingsthat are produced from metal powders utilizing powder metal-lurgy(PM)technology and then impregnated with oil to supplyoperating lubrication.1.2 Listed are the chemical,physical,and mechanical speci-fications for those standardized ferro
4、us PM materials that havebeen developed specifically for the manufacture of self-lubricating bearings.1.3 This standard is a companion to Specification B438 thatcovers the requirements for porous oil-impregnated bronze-base bearings.1.4 Typical applications for self-lubricating iron-base PMbearings
5、are discussed in Appendix X1.1.5 Commercial bearing dimensional tolerance data areshown in Appendix X2,while engineering information regard-ing installation and operating parameters of PM bearings isincluded in Appendix X3.Additional useful information onself-lubricating bearings can be found in MPI
6、F Standard 35(Bearings),ISO 5755 and the technical literature.21.6 UnitsWith the exception of the values for density andthe mass used to determine density,for which the use of theg/cm3unit is the long-standing practice of the PM industry,thevalues stated in inch-pound units are to be regarded asstan
7、dard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not to be regarded as standard1.7 The following safety hazards caveat pertains only to thetest methods described in this specification.This standard doesnot purport to address a
8、ll of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety,health,and environ-mental practices and determine the applicability of regulatorylimitations prior to use.1.8 This international standard was developed in acc
9、or-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM S
10、tandards:3B243 Terminology of Powder MetallurgyB438 Specification for Bronze-Base Powder Metallurgy(PM)Bearings(Oil-Impregnated)B939 Test Method for Radial Crushing Strength,K,ofPowder Metallurgy(PM)Bearings and Structural Materi-alsB962 Test Methods for Density of Compacted or SinteredPowder Metall
11、urgy(PM)Products Using ArchimedesPrincipleB963 Test Methods for Oil Content,Oil-ImpregnationEfficiency,and Surface-Connected Porosity of SinteredPowder Metallurgy(PM)Products Using ArchimedesPrincipleE9 Test Methods of Compression Testing of Metallic Mate-rials at Room TemperatureE29 Practice for Us
12、ing Significant Digits in Test Data toDetermine Conformance with SpecificationsE1019 Test Methods for Determination of Carbon,Sulfur,Nitrogen,and Oxygen in Steel,Iron,Nickel,and CobaltAlloys by Various Combustion and Fusion Techniques2.2 MPIF Standard:4MPIF Standard 35 Materials Standards for PM Sel
13、f-Lubricating Bearings1This specification is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.04 on Bearings.Current edition approved April 1,2018.Published May 2018.Replaces portionsof B612 and B782.Original
14、ly approved in 1966 to replace portions of B202.Lastprevious edition approved in 2012 as B439 12.DOI:10.1520/B0439-18.2Machine Design Magazine,Vol 54,No.14,June 17,1982,pp.130142.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For
15、 Annual Book of ASTMStandardsvolume information,refer to the standards Document Summary page onthe ASTM website.4Available from Metal Powder Industries Federations,105 College Road East,Princeton,NJ 08540,http:/www.infompif.org.*A Summary of Changes section appears at the end of this standardCopyrig
16、ht ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 2.3 ISO Standards:5ISO 2795 Plain bearings from sintered metalDimensionsand toleran
