ASTM_D_6425_-_11.pdf

Designation:D642511Standard Test Method forMeasuring Friction and Wear Properties of ExtremePressure(EP)Lubricating Oils Using SRV Test Machine1This standard is issued under the fixed designation D6425;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.INTRODUCTIONThis test method represents the transformation of DIN 51834-2:1997.The DIN working groupimplemented changes at its annual meeting in Munich in September 2000.ASTM Committee D02adopted these modifications as closely as possible.The DIN working group widens the scope of thestandard to accommodate different test conditions and refines repeatability and reproducibility on thebase of four international RR tests.It also introduces the wear volume as a tribological quantity.1.Scope*1.1 This test method covers an extreme pressure(EP)lubricating oils coefficient of friction and its ability to protectagainst wear when subjected to high-frequency,linear oscilla-tion motion.The procedure is identical to that described in DIN51834.1.2 This test method can also be used to determine theability of a non-EP lubricating oil to protect against wear andits coefficient of friction under similar test conditions.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A295 Specification for High-Carbon Anti-Friction BearingSteelD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD5706 Test Method for Determining Extreme PressureProperties of Lubricating Greases Using a High-Frequency,Linear-Oscillation(SRV)Test MachineD7421 Test Method for Determining Extreme PressureProperties of Lubricating Oils Using High-Frequency,Linear-Oscillation(SRV)Test MachineE45 Test Methods for Determining the Inclusion Content ofSteelG40 Terminology Relating to Wear and Erosion2.2 DIN Standards:3DIN EN ISO 683-17 Heat-treated Steels,alloy steels andfree-cutting steels Part 17:Ball and roller bearing steelsDIN 51631:1999 Mineral spirits;special boiling point spir-its;requirementsDIN 51834 Tribological Test in the Translatory OscillationApparatus(Part 2:Determination of Friction and WearData for Lubricating Oils)DIN EN ISO 13565-2:1998 Geometrical Product Specifica-tions(GPS)Surface Texture:Profile Method;Surfaceshaving Stratified Functional PropertiesPart 2:HeightCharacterization using Linear Material Ratio Curve(re-placement of DIN 4776:1990)3.Terminology3.1 Definitions:3.1.1 break-in,nin tribology,an initial transition processoccurring in newly established wearing contacts,often accom-panied by transients in coefficient of friction or wear rate,orboth,that are uncharacteristic of the given tribological sys-tems long term behavior.(Synonym:run-in,wear-in)G401This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.11 on Tribiological Properties of Industrial Fluids andLubricates.Current edition approved Dec.1,2011.Published March 2012.Originallyapproved in 1999.Last previous edition approved in 2010 as D642505(2010)1.DOI:10.1520/D6425-11.2For 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 Deutsches Institut fr Normung,Beuth Verlag GmbH,Burg-grafenstrasse 6,D-10787 Berlin,Germany.*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 3.1.2 C.L.A.,nin measuring surface finish,the arithmeticaverage of the absolute distances of all profile points from themean line for a given distance.43.1.3 coeffcient of friction or f,nin tribology,thedimensionless ratio of the friction force(Ff)between twobodies to the normal force(Fn)pressing these bodies together.G40 5Ff/Fn!(1)3.1.4 EP lubricating oil,na liquid lubricant containing anextreme pressure(EP)additive3.1.5 extreme pressure(EP)additive,nin a lubricant,asubstance that minimizes damage to metal surfaces in contactunder high stress rubbing conditions.D41753.1.6 Hertzian contact area,nthe apparent area of contactbetween two nonconforming solid bodies pressed against eachother,as calculated from Hertz equations of elasticdeformation.G403.1.7 Hertzian contact pressure,nmagnitude of the pres-s