ASTM_D_6200_-_01_2012.pdf

Designation:D620001(Reapproved 2012)Standard Test Method forDetermination of Cooling Characteristics of Quench Oils byCooling Curve Analysis1This standard is issued under the fixed designation D6200;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.Scope1.1 This test method describes the equipment and theprocedure for evaluation of a quenching oils quenchingcharacteristics by cooling rate determination.1.2 This test is designed to evaluate quenching oils in anon-agitated system.There is no correlation between these testresults and the results obtained in agitated systems.1.3 The values in SI units are to be regarded as the standard.The values in parentheses are provided for information only.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:2D1744 Test Method for Determination of Water in LiquidPetroleum Products by Karl Fischer ReagentE220 Test Method for Calibration of Thermocouples ByComparison TechniquesE230 Specification and Temperature-Electromotive Force(EMF)Tables for Standardized Thermocouples2.2 SAE Standards:3AMS 5665 Nickel Alloy Corrosion and Heat Resistant Bars,Forgings and Rings2.3 Japanese Industrial Standards(JIS):4JIS K 2242-1980 Heat Treating OilJIS K 6753-1977 Di-2-ethylhexyl Phthalate3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 cooling curve,nthe cooling curve is a graphicalrepresentation of the cooling time(t)-temperature(T)re-sponse of the probe(see 7.3).An example is illustrated in PartB of Fig.1.3.1.2 cooling curve analysis,nthe process of quantifyingthe cooling characteristics of a heat treating oil based on thetemperature versus time profile obtained by cooling a pre-heated metal probe assembly(see Fig.2)under standardconditions.3.1.3 cooling rate curve,nThe cooling rate curve isobtained by calculating the first derivative(dT/dt)of thecooling time-temperature curve.An example is illustrated inPart B of Fig.1.3.1.4 heat treating oil,na hydrocarbon containingproduct,often derived from petroleum base stock,that is usedto mediate heat transfer between heated metal,such as austen-itized steel,to control the microstructure that is formed uponcooling and also control distortion and minimize crackingwhich may accompany the cooling process.3.1.5 quench severity,nthe ability of a quenching mediumto extract heat from a hot metal.54.Summary of Test Method4.1 Determine the nickel alloy probe assemblys coolingtime versus temperature after placing the assembly in a furnaceand heating to 850C(1562F)and then quenching in a heattreating oil.The temperature inside the probe assembly and thecooling times are recorded at selected time intervals to estab-lish a cooling temperature versus time curve.The resultingcooling curve may be used to evaluate quench severity(seeNote 1).NOTE1For production testing,the furnace temperature of 815 to857C(1500 to 1575F)may be used.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.06 on Non-Lubricating Process Fluids.Current edition approved April 15,2012.Published May 2012.Originallyapproved in 1997.Last previous edition approved in 2007 as D620001(2007).DOI:10.1520/D6200-01R12.2For 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 Society of Automotive Engineers(SAE),400 CommonwealthDr.,Warrendale,PA 15096-0001,http:/www.sae.org.4Available from Japanese Standards Organization(JSA),4-1-24 AkasakaMinato-Ku,Tokyo,107-8440,Japan,http:/www.jsa.or.ja.5Boyer,H.E.and Cary,P.R.,Quenching and Distortion Control,ASMInternational,Materials Park,OH,1988,p.162.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 This test method provides a cooling time versus tem-perature pathway which is directly proportional to physicalproperties such as the hardness obtainable upon quenching ofa metal.The results obtained by this test may be used as a guideFIG.1 Typical Temperature/Time and Temperature/Cooling Rate Plots For Test Probe Cooled in a Quenching OilFIG.2 Probe Details and General Probe AssemblyD6200 01(2012)2 in heat treating oil selection or comparison of quench severitiesof different heat treating oils,new or used.6.Interferences6.1 The presence of water in a