ASTM_D_6549_-_06_2015.pdf

Designation:D654906(Reapproved 2015)Standard Test Method forDetermination of Cooling Characteristics of Quenchants byCooling Curve Analysis with Agitation(Drayton Unit)1This standard is issued under the fixed designation D6549;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 Drayton Agitation Unit.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:2E220 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 Other Standards:4Wolfson Engineering Group Specification Laboratory Testsfor Assessing the Cooling Curve Characteristics of Indus-trial Quenching Media2.4 ASTM Adjuncts:5ADJD6300D2PP,Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricants3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 aqueous polymer quenchantan aqueous polymerquenchant is an aqueous solution containing a water solublepolymer,typically including poly(alkylene glycol),poly(ethyloxazoline),poly(sodium acrylate),and poly(vinyl pyrrolidone)(1,2,3).6The quenchant solution also typically containsadditives for corrosion and foam control,if needed.Quenchseverity of aqueous polymer quenchants is dependent onconcentration and molecular weight of the specific polymerbeing evaluated,quenchant temperature,and agitation rate asshown in Fig.1,Fig.2,and Fig.3,respectively.3.1.2 cooling curvethe cooling curve is a graphical repre-sentation of the cooling time(t)versus temperature(T)response of the probe(see 7.3).An example is illustrated inFig.4.3.1.3 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.4)under standard conditions(1-7).3.1.4 cooling rate curvethe cooling rate curve is a graphi-cal representation of first derivative of the cooling curve,therate of temperature change(dT/dt)versus temperature.Anexample is illustrated in Fig.4.3.1.5 quenchanta quenching medium may be either aliquid or a gas.Gasses that are used as quenchants include air,nitrogen,argon,and hydrogen and,with the exception of air,which is used at atmospheric pressure,are used under pressure.Liquid quenchants include water,brine(most commonly diluteaqueous solutions of sodium chloride or sodium hydroxide),oil,molten salt,molten metal,and aqueous solutions of watersoluble polymers.Water,brine,oil,and aqueous polymerquenchants are generally used with agitation.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 July 1,2015.Published July 2015.Originally approvedin 2000.Last previous edition approved in 2011 as D6549 06(2011).DOI:10.1520/D6549-06R15.2For 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 Wolfson Heat Treatment Centre,Federation House,Vyse St.,Birmingham,B18 6LT,UK.http:/www.sea.org.uk/whtc.5No longer available from ASTM International Headquarters.6The 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 3.1.6 quench severitythe ability of a quenching medium toextract heat from a hot metal(8).FIG.1 Effect of Quenchant Concentration on Cooling Curve Performance for a Poly(Alkylene Glycol)Quenchant at 30C and 0.5 m/sFIG.2 Effect of Bath Temperature Variation on Cooling Curve Performance for 15%Aqueous Solution of Poly(Alkylene Glycol)Quen-chant at 0.5 m/sFIG.3 Effect of Agitation R