ASTM_D_6482_-_06_2011.pdf

Designation:D648206(Reapproved 2011)Standard Test Method forDetermination of Cooling Characteristics of AqueousPolymer Quenchants by Cooling Curve Analysis withAgitation(Tensi Method)1This standard is issued under the fixed designation D6482;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 covers the equipment and the proce-dure for evaluation of quenching characteristics of a quenchingfluid by cooling rate determination.1.2 This test method is designed to evaluate quenchingfluids with agitation,using the Tensi agitation apparatus.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.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:2D6200 Test Method for Determination of Cooling Charac-teristics of Quench Oils by Cooling Curve AnalysisE220 Test Method for Calibration of Thermocouples ByComparison TechniquesE230 Specification and Temperature-Electromotive Force(EMF)Tables for Standardized Thermocouples2.2 SAE Standard:3AMS 5665 Nickel Alloy Corrosion and Heat Resistant Bars,Forgings and Rings2.3 Japanese Industrial Standards:4JIS K 2242 Heat Treating OilJIS K 6753 Di-2-ethylhexyl Phthalate2.4 Wolfson Engineering Group:5Wolfson Engineering Group Specification Laboratory Testsfor Assessing the Cooling Curve of Industrial QuenchingMedia2.5 ASTM Adjuncts:6ADJD6300D2PP,Determination of Precision and BiasData for Use in Test Methods for Petroleum Products3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 aqueous polymer quenchantan aqueous solutioncontaining a water soluble polymer;typically including poly-(alkylene glycol),poly(ethyl oxazoline),poly(solium acrylate)and poly(vinyl pyrrolidone)(1,2).7The quenchant solutionalso typically contains additives for corrosion and foamcontrol,if needed.Quench severity of aqueous polymer quen-chants is dependent on concentration and molecular weight ofthe specific polymer being evaluated,quenchant temperature,and agitation rate as shown in Figs.1-3,respectively.3.1.2 cooling curvea graphical representation of the cool-ing time(t)-temperature(T)response of the probe(see 7.3).Anexample is illustrated in Fig.4A.3.1.3 cooling curve analysisthe process of quantifying thecooling characteristics of a quenchant based on the temperatureversus time profile obtained by cooling a preheated metal probeassembly(see Fig.5)under standard conditions(1,3,4).3.1.4 cooling rate curveobtained by calculating the firstderivative(dT/dt)of the cooling time-temperature curve.Anexample is illustrated in Fig.4B.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 May 1,2011.Published August 2011.Originallyapproved in 1999.Last previous edition approved in 2006 as D648206.DOI:10.1520/D6482-06R11.2For 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 SAE International(SAE),400 Commonwealth Dr.,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.jp.5Wolfson Heat Treatment Centre,Federation House,Vyse St.,Birmingham,B186LT,UK,http:/www.sea.org.uk/whtc.6No longer available from ASTM International Headquarters.7The boldface numbers in parentheses refer to the list of references at the end ofthis standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.5 quench severitythe ability of a quenching medium toextract heat from a hot metal(5).3.1.6 quenchantany medium,liquid or gas that may beused to mediate heat transfer during the cooling of hot metal.4.Summary of Test Method4.1 The nickel alloy probe assemblys cooling time versustemperature is determined after placing the assembly in afurnace and heating to 850C(1562F)and then quenchinginto an aqueous polymer quenchant solution.The temperatureinside the probe assembly and the cooling times are recorded atselected time intervals to establish a cooling temperatureversus time curve.The resulting cooling curve may be used toevaluate quench severity(see Note 1).NOTE1For production testing,the furnace temperature