1、Designation:D226601(Reapproved 2015)Standard Test Method forWear Preventive Characteristics of Lubricating Grease(Four-Ball Method)1This standard is issued under the fixed designation D2266;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revi
2、sion,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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method cove
3、rs the determination of the wearpreventive characteristics of greases in sliding steel-on-steelapplications.It is not intended to predict wear characteristicswith metal combinations other than steel-on-steel or to evaluatethe extreme pressure characteristics of the grease.1.2 The values stated in SI
4、 units are to be regarded as thestandard except where the test apparatus or consumable partsare only available in other units.In such cases,these will beregarded as standard.The values given in parentheses are forinformation only.1.3 This standard does not purport to address all of thesafety problem
5、s,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:2D4172 Test Method for Wear Preventive Characte
6、ristics ofLubricating Fluid(Four-Ball Method)D6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricants2.2 ANSI Standard:3B3.12 for Metal Balls3.Terminology3.1 There are no terms in this test method that require newor other than dictionary
7、 definitions.4.Summary of Test Method4.1 Three12in.(12.7 mm)diameter steel balls are clampedtogether and covered with the lubricant to be evaluated.Afourth12in.diameter steel ball,referred to as the top ball,ispressed with a force of 40 kgf(392 N)into the cavity formedby the three clamped balls for
8、three-point contact.The tem-perature of the lubricating grease specimen is regulated at75 C(167 F)and then the top ball is rotated at 1200 r minfor 60 min.Lubricants are compared by using the average sizeof the scar diameters worn on the three lower clamped balls.NOTE1Because of differences in the c
9、onstruction of the variousmachines on which the four-ball test can be made,the manufacturersinstructions should be consulted for proper machine setup and operation.NOTE2Although the test can be run under other test parameters,theprecision noted in Section 11 can vary when testing with other than tes
10、tparameters listed in Section 8.5.Significance and Use5.1 The four-ball wear-test method can be used to determinethe relative wear-preventing properties of greases under the testconditions and if the test conditions are changed the relativeratings may be different.No correlation has been established
11、between the four-ball wear test and field service.The test1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.G0.04 on Functional Tests-Tribology.Current edition approved April 1,2015.P
12、ublished June 2015.Originallyapproved in 1964.Last previous edition approved in 2008 as D2266 01(2008).This test method has been adopted for use by government agencies to replaceMethod 6514 of Federal Test Method Standard No.791b.DOI:10.1520/D2266-01R15.2For referenced ASTM standards,visit the ASTM
13、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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.
14、ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 method cannot be used to differentiate between ExtremePressure(EP)and Non-Extreme Pressure(Non-EP)Greases.46.Apparatus6.1 Four-Ball Wear-Tester and AccessoriesSee Fig.1 andFig.2.5NO
15、TE3It is important to distinguish between the Four-Ball EP Testerand the Four-Ball Wear Tester.The Four-Ball EP Tester is designed fortesting under heavier loads and more severe conditions;it lacks thesensitivity necessary for performing four-ball wear test.6.2 Microscope,6capable of measuring the d
16、iameters of thescars produced on the three stationary balls to an accuracy of0.01 mm.It is more efficient to measure the scars withoutremoving the three balls from the holder.7.Reagents and Materials7.1 Test Balls7,chrome alloy steel,made fromAISI standardsteel No.E-52100,with diameter of 0.5 in.(12.7 mm),Grade25 EP(Extra Polish).Such balls are described in B3.12,forMetal Balls.The Extra-Polish finish is not described in thatspecification.The Rockwell C hardness shall be 64 to 66,acloser limit t
