1、Designation:D7452191Standard Test Method forEvaluation of the Load Carrying Properties of LubricantsUsed for Final Drive Axles,Under Conditions of High Speedand Shock Loading1This standard is issued under the fixed designation D7452;the number immediately following the designation indicates the year
2、 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.1NOTEEditorially updated TMC governance information in June 2022.INTRODUCT
3、IONPortions of this test method are written for use by laboratories that make use of ASTM TestMonitoring Center(TMC)2services(see Annex A1 Annex A4).The TMC provides reference oils,and engineering and statistical services to laboratories that desireto produce test results that are statistically simi
4、lar to those produced by laboratories previouslycalibrated by the TMC.In general,the Test Purchaser decides if a calibrated test stand is to be used.Organizations such asthe American Chemistry Council require that a laboratory use the TMC services as part of their testregistration process.In additio
5、n,the American Petroleum Institute and the Gear Lubricant ReviewCommittee of the Lubricant Review Institute(SAE International)require that a laboratory use theTMC services in seeking qualification of oils against their specifications.The advantage of using the TMC services to calibrate test stands i
6、s that the test laboratory(andhence the Test Purchaser)has an assurance that the test stand was operating at the proper level of testseverity.It should also be borne in mind that results obtained in a non-calibrated test stand may notbe the same as those obtained in a test stand participating in the
7、 ASTM TMC services process.Laboratories that choose not to use the TMC services may simply disregard these portions.1.Scope*1.1 This test method covers the determination of the anti-scoring properties of final drive axle lubricating oils whensubjected to high-speed and shock conditions.This test met
8、hodis commonly referred to as the L-42 test.21.2 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.1.2.1 ExceptionsSI units are provided for
9、 all parametersexcept where there is no direct equivalent such as the units forscrew threads,National Pipe Threads/diameters,tubing size,and single source equipment suppliers.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibilit
10、y of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific warning information is given in Sections 4 and 7.1.4 This international standard was developed in accor-dance with inter
11、nationally 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 Standards:31This tes
12、t method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.B0.03 on Automotive Gear Lubricants&Fluids.Current edition approved July 1,2019.Published August 2019.Originallyapproved in 2008.Last previous
13、 edition approved in 2017 as D7452 17.DOI:10.1520/D7452-19E01.2Until the next revision of this test method,the ASTM Test Monitoring Center(TMC)will update changes in this test method by means of information letters.Information letters may be obtained from the ASTM Test Monitoring Center,203Armstrong
14、 Drive,Freeport,PA16229,Attention:Director.This edition incorporatesrevisions in all information Letters through No.19-1.The TMC is also a source ofreference oils.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of
15、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 StatesThis international standard wa
16、s 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.1D235 Specification for Mineral Spirits(Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Society of Automotive
