ASTM_D_7421_-_11.pdf

Designation:D742111Standard Test Method forDetermining Extreme Pressure Properties of LubricatingOils Using High-Frequency,Linear-Oscillation(SRV)TestMachine1This standard is issued under the fixed designation D7421;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.1.Scope*1.1 This test method covers a procedure for determiningextreme pressure properties of lubricating oils for hydraulics,gears and engines under high-frequency linear-oscillation mo-tion using the SRV test machine.NOTE1This test method was developed and the international roundrobin tests were jointly performed with the DIN 51834 working group.This procedure is based on the 2005 revision of Test Method D5706 forgreases and differs regarding the stroke length and the cleaning solvent.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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/A295M Specification for High-Carbon Anti-FrictionBearing SteelD235 Specification for Mineral Spirits(Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD5706 Test Method for Determining Extreme PressureProperties of Lubricating Greases Using a High-Frequency,Linear-Oscillation(SRV)Test MachineD6425 Test Method for Measuring Friction and Wear Prop-erties of Extreme Pressure(EP)Lubricating Oils UsingSRV Test MachineE45 Test Methods for Determining the Inclusion Content ofSteelG40 Terminology Relating to Wear and Erosion2.2 DIN Standards:3DIN 51631:1999 Mineral spirits;special boiling point spir-its;requirementsDIN EN ISO 683-17 Heat-treated Steels,alloy steels andfree-cutting steels Part 17:Ball and roller bearing steels(Replaces DIN 17230-1980)DIN EN ISO 13565-2:1998 Geometrical Product Specifica-tions(GPS)Surface texture:Profile method;Surfaceshaving stratified functional properties Part 2:Heightcharacterization using linear material ratio curve Re-placement of DIN 4776:1990:Measurement of surfaceroughness;parameters RK,RPK,RVK,Mr1,Mr2for thedescription of the material portion3.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,which are uncharacteristic of the given tribologicalsystems long-term behavior.G403.1.2 coeffcient of friction,or f,nin tribology,thedimensionless ratio of the friction force(F)between twobodies to the normal force(N)pressing these bodies together.G403.1.3 Hertzian contact area,napparent area of contactbetween two nonconforming solid bodies pressed against eachother,as calculated from Hertzs equations of elastic deforma-tion published in 1881.G403.1.4 Hertzian contact pressure,nmagnitude of the pres-sure at any specified location in a Hertzian contact area,ascalculated from Hertzs equations of elastic deformation.The1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0 on Industrial Lubricants and Engineering Sciences of HighPerformance Fluids and Solids.Current edition approved Dec.1,2011.Published March 2012.Originallyapproved in 2008.Last previous edition approved in 2008 as D742108.DOI:10.1520/D7421-11.2For 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 Beuth Verlag GmbH(DIN,Deutsches Institut fur Normunge.V.),Burggrafenstrasse 6,10787,Berlin,Germany,http:/www.en.din.de.*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 Hertzian contact pressure can also be calculated and reportedas maximum value Pmaxin the centre of the contact or asPaverageas average over the total contact area.G403.1.5 lubricant,nany material interposed between twosurfaces that reduces the friction or wear,or both betweenthem.D41753.1.6 Ra(C.L.A.),nin measuring surface finish,the arith-metic average of the absolute distances of all profile pointsfrom the mean line for a given distance.Amstutz43.1.6.1 DiscussionC.L.A.means center line average,andit is the synonym to Ra.3.1.7 Rpk,nReduced peak height according to DIN ENISO 1356