AMS2772-Aluminum-Raw-Material-HT

SAETechnicalStandardsBoardRulesprovidethat:“ThisreportispublishedbySAEtoadvancethestateoftechnicalandengineeringsciences.Theuseofthisreportisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesoleresponsibilityoftheuser.”SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhichtimeitmaybereaffirmed,revised,orcancelled.SAEinvitesyourwrittencommentsandsuggestions.Copyright©2008SAEInternationalAllrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystemortransmitted,inanyformorbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,withoutthepriorwrittenpermissionofSAE.TOPLACEADOCUMENTORDER:Tel:877-606-7323(insideUSAandCanada)Tel:724-776-4970(outsideUSA)Fax:724-776-0790Email:CustomerService@sae.orgSAEWEBADDRESS:http://www.sae.orgAMS2772EAEROSPACEMATERIALSPECIFICATIONIssued1997-01Revised2008-02SupersedingAMS2772DHeatTreatmentofAluminumAlloyRawMaterialsRATIONALEAMS2772EistheresultofanapprovedLimitedScopeBallot,byAMSCommitteeD,tocorrectfourtypographicalerrorsinAMS2772D.1.SCOPE1.1PurposeThisspecificationcoversrequirementsandrecommendationsfortheheattreatmentofwroughtaluminumalloyrawmaterials(See8.2.1)byproducers.ItsupersedesAMS-H-6088andreplacesMIL-H-6088.1.1.1TempersAluminumalloytempersaredescribedinSAEAS1990andANSIH35.1.1.1.2OtherAlloysThisspecificationmaybeusedforalloysotherthanthosespecifiedhereinprovidingtemperatures,times,andquenchantarespecified.1.1.3OtherHeatTreatment1.1.3.1Parts(See8.2.2)MadefromwroughtrawmaterialshallbeheattreatedinaccordancewithAMS2770.1.1.3.2CastingsandPartsMadefromCastingsArenotcoveredbythisspecification;heattreatmentofaluminumcastingsandpartsmadefromsuchcastingsiscoveredbyAMS2771.1.1.3.3TemperConversionWarehouses,distributorsetc.shallconformto3.8.1.1.3.4ProcedureforResponse-to-Heat-TreatmentTestsShallconformto3.9.CopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=ParkerHannifin-Categories/5936628103NotforResale,01/25/201009:13:32MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,````,,`,,,`,,,`,,,,,``-`-`,,`,,`,`,,`---SAEAMS2772E-2-2.APPLICABLEDOCUMENTSTheissueofthefollowingdocumentsineffectonthedateofthepurchaseorderformsapartofthisspecificationtotheextentspecifiedherein.Thesuppliermayworktoasubsequentrevisionofadocumentunlessaspecificdocumentissueisspecified.Whenthereferenceddocumenthasbeencancelledandnosupersedingdocumenthasbeenspecified,thelastpublishedissueofthatdocumentshallapply.2.1SAEPublicationsAvailablefromSAEInternational,400CommonwealthDrive,Warrendale,PA15096-0001,Tel:877-606-7323(insideUSAandCanada)or724-776-4970(outsideUSA),www.sae.org.AMS2750PyrometryAMS2770HeatTreatmentofWroughtAluminumAlloyPartsAMS2771HeatTreatmentofAluminumAlloyCastingsAMS-H-6088HeatTreatmentofAluminumAlloysARP1962TrainingandApprovalofHeatTreatingPersonnelAS1990AluminumAlloyTempers2.2ASTMPublicationsAvailablefromASTMInternational,100BarrHarborDrive,P.O.BoxC700,WestConshohocken,PA19428-2959,Tel:610-832-9585,www.astm.org.ASTMSTP15DManualonPresentationofDataandControlChartAnalysisASTMB557TensionTestingWroughtandCastAluminum-andMagnesium-AlloyProductsASTMB557MTensionTestingWroughtandCastAluminum-andMagnesium-AlloyProducts(Metric)ASTMB666/B666MIdentificationMarkingofAluminumandMagnesiumProductsASTMG110EvaluatingIntergranularCorrosionResistanceofHeatTreatableAluminumAlloysbyImmersioninSodiumChloride+HydrogenPeroxideSolution2.3U.S.GovernmentPublicationsAvailablefromtheDocumentAutomationandProductionService(DAPS),Building4/D,700RobbinsAvenue,Philadelphia,PA19111-5094,Tel:215-697-6257,http://assist.daps.dla.mil/quicksearch/.MIL-H-6088HeatTreatmentofAluminumAlloysMIL-STD-1537ElectricalConductivityTestforVerificationofHeatTreatmentofAluminumAlloys,EddyCurrentMethod2.4ANSIPublicationsAvailablefromAmericanNationalStandardsInstitute,25West43rdStreet,NewYork,NY10036,Tel:212-642-4900,www.ansi.org.ANSIH35.1AmericanNationalStandardAlloyandTemperDesignationSystemsforAluminum2.5BattellePublicationsAvailablefromBattelle,505KingAve,Columbus,OH43201orwww.mmpds.org.MMPDSMetallicMaterialsPropertiesDevelopmentandStandardization(MMPDS)CopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=ParkerHannifin-Categories/5936628103NotforResale,01/25/201009:13:32MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,````,,`,,,`,,,`,,,,,``-`-`,,`,,`,`,,`---SAEAMS2772E-3-3.TECHNICALREQUIREMENTS3.1EquipmentQualificationBeforeproductionheattreatment,eachsolutionheattreatingfurnace/quenchfacilityandeachagingfurnaceshallbequalifiedbytensileandmetallurgicaltesting(See4.4)ofheattreatedsamplesrepresentativeofthemostquench-sensitive(See4.3.2.5.1)producttobeheattreated.Inaddition,qualificationofquenchfacilitiesshallincludeconformanceto4.3.3.1.1SampleThicknessTensiletestsshallberepresentativeofthethinnestandthethickestmaterialtobeheattreated;intermediatethicknesssamplesshallbeincludedwhennecessarytoensureproperproductionheattreatment.Thicknessformetallurgicaltestsshallconformto4.4.3.1.2SampleLocationsSamplesshallberandomlypositionedinsimulatedproductionloadsexceptatleastoneofthetensiletestsamplesshallbepositionedatalocationwhichexhibitedaconductivitywithin0.3%ofthehighestconductivityinaquenchuniformitytest.3.1.3EquipmentRe-QualificationWheneveranyqualifiedequipmentischangedorreworked,itshallbere-qualifiedunlessitisknownthatthechangeorreworkwillnothaveadetrimentaleffectuponthepropertiesofproducts.Re-qualificationofquenchfacilitiesshallincludeconformanceto4.3.3.2PyrometryShallconformtoAMS2750except(1)itisnotapplicabletofurnacesusedonlyforstressrelievingorfullannealingbelow825°F(441°C),(2)recordingsfrominstrumentsmaybestoredonmagneticoropticalmediaprovidingahardcopyisproducibleonrequest,and(3)incontinuousandsemi-continuousfurnaces,therequirementsapplicabletocontrols,instruments,andsensorsintheworking(soaking)zoneshallalsobeapplicabletotheheating(heat-up)zone.3.2.1ThetemperatureuniformitytestrequirementsofAMS2750shallbemodifiedasfollows:3.2.1.1LoadConditionInitialtestsshallbeperformedwithatypicalload.Subsequenttestsmaybeperformedwithanyloadornoload.Furnaceswhichhaveonlybeentestedwithaheavyload(inanticipationofonlyheattreatingheavyloads)(See8.2.9)shallnotbeusedtoheattreatlightloadsunlessloadsensorsandrecordinginstrumentsareemployedto(1)precludeanyportionoftheloadexceedingthemaximumspecifiedtemperatureonheat-upand(2)ensuresoakingwithinthespecifiedrangefortherequiredtime.3.2.1.2LoadSensorsWhenallproductionloadsareheavy(See8.2.9)andatemperatureuniformitytestloadisheavy,loadsensorsmaybeusedinlieuofuniformitytestsensors.3.2.1.3LoadedFurnacesDuringtheheat-upportionofuniformitytestsperformedonaloadedbatchfurnaceandduringtheperiodthataloadisintheheating(heat-up)zone(s)ofcontinuousandsemi-continuousfurnaces,thetemperatureoftheheatingmediummayexceedthemaximumoftherangebeingtestedprovidingthatthemetaltemperaturedoesnotexceedthatmaximum.CopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=ParkerHannifin-Categories/5936628103NotforResale,01/25/201009:13:32MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,````,,`,,,`,,,`,,,,,``-`-`,,`,,`,`,,`---SAEAMS2772E-4-3.2.1.4UniformityRequirementsDuringthetestperiod,thetemperatureofallworkingandtestsensorsintheworking(soaking)zoneshallbewithinthefollowingallowableranges(theserangessupersedethe±temperaturetolerancesspecifiedinAMS2750):3.2.1.4.150°F(28°C)rangeforfurnacesusedonlyforfullannealingat825°F(441°C)andhigher.Annealingtemperaturesshallbecontrolledsoastoprecludeanymaterialexceedingthelowestsolutionheattreatingtemperatureforthealloybeingannealed.3.2.1.4.1.1Forfurnacesusedonlyforfullannealingbelow825°F(441°C)andforstressrelieving,therearenotemperatureuniformityrequirements.3.2.1.4.230°F(17°C)rangeforfurnacesusedonlyforsolutionheattreatmentofthose6xxxalloysforwhichTable1specifiesarangeof30°F(17°C)degreesormore.3.2.1.4.320°F(11°C)rangeforfurnacesusedforsolutionheattreatmentof6xxxalloysforwhichTable1specifiesarangeoflessthan30°F(17°C).3.2.1.4.420°F(11°C)rangeforfurnacesusedforsolutionheattreatmentofotheralloysexcept10°F(6°C)rangeforfurnacesusedforsolutionheattreatmentof8090sheet.3.2.1.4.520°F(11°C)rangeforfurnacesusedforagingtreatments.3.2.1.4.620°F(11°C)rangeforfurnacesusedforprocessingtothe-O1temper.3.3HeatingMediaforSolutionHeatTreatmentShallbeair,protectiveatmosphere,combustedgases,moltensaltbath,orfluidizedbed.However,noprotectiveatmosphere,combustedgasorfluidizedbedenvironmentshallbeusedunlessithasbeenshownbytest(inaccordancewith4.4.1.1),onthealloy/formtobeheattreated,toyieldproductwhichisfreefromheattreatinducedporosity.Compositionofsaltbathsandfluidizedbedsshallbemaintainedtopreventattackoftheproduct.3.4PreparationforHeatTreatment3.4.1CleanlinessPriortoheattreating,productshallbefreefromsurfacecontaminantswhichcouldhaveadetrimentaleffectonthematerial.3.4.2RackingandSpacingDuringsolutionheattreatment,productshallbesupportedorhungandspacedtopermitflowoftheheatingandcoolingmediaoverallsurfacestoensurethatallproductwillmeetthespecifiedrequirements.Duringaging,productshallbesupportedorhungandspacedsothatitwillbeheatedandsoakedasrequiredtomeetthespecifiedrequirements.3.4.2.1Loadarrangementshallbevalidatedbyheattreatmentofasimilarlyarrangedload(See8.2.10)containingoneormoreappropriatelyplacedloadsensorswhichshowthatallproductwillbesoakedwithinthespecifiedtemperaturerangeforatimewhichhasbeenpreviouslyshown,bytensiletests,toproducethespecifiedproperties(notrequiredforloadarrangementswhichhavebeenpreviouslyvalidatedinaccordancewithMIL-H-6088,AMS-H-6088orapreviousissueofAMS2772).Writteninstructions,drawings,photographs,orotherillustrationsshallbeusedtoensureproperloadarrangements.CopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=ParkerHannifin-Categories/5936628103NotforResale,01/25/201009:13:32MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,````,,`,,,`,,,`,,,,,``-`-`,,`,,`,`,,`---SAEAMS2772E-5-3.4.2.2ThinForgingsRandomracking(notnested)orlayeringofforgings,1-inch(25-mm)andunderinthicknessispermissiblefor(1)solutionheattreating(providingquenchingisbyimmersion),(2)aging,and(3)annealing,providingproductsorackedhasbeendemonstratedbytesttomeetthespecifiedrequirements.Layerthicknessshallnotexceedthreeinches(76mm)anddistancebetweenlayersshallbeatleastthreeinches(76mm)(notrequiredforloadarrangementswhichhavebeenpreviouslyvalidatedinaccordancewithMIL-H-6088,AMS-H-6088,orapreviousissueofAMS2772).3.5Temperatures3.5.1Furnacetemperaturesshallbecontrolledsoastoensurethatthemetaltemperaturedoesnotexceedthemaximumoftherange.3.5.1.1Whenaloadischargedintoabatchfurnacewhoseindicatedtemperatureishigherthanthemaximumofthespecifiedrange,arecordingloadsensor,incontactwiththethinnestmaterialontheoutsideoftheload,shallbeusedtoverifythatthemetaltemperaturedidnotexceedthemaximumoftherange.3.6SolutionHeatTreatment3.6.1Productshallbesoaked,inaccordancewith3.6.2,withinthetemperaturerangespecifiedinTable1andquenchedasspecifiedin3.6.3.Quenchingdirectlyfromafurnaceorsaltbathisrequired.Extrusionpressquenching(see8.2.6)androllingmillquenching(see8.2.7)arenotpermittedbyAMS2772.3.6.2Soaking3.6.2.1StartSoakingtimeshallstartwhenthereadingsofallloadsensorsindicatethatthetemperatureoftheloadhasreachedtheminimumoftherequiredtemperaturerange.Alternatively,determinationthatthetemperatureoftheloadhasreachedtheminimumoftherequiredtemperaturerange(startofsoakingtime)maybebasedonreadingsoffurnaceinstrumentsprovidingthelagbetweentheirreadingsandloadtemperaturehasbeendeterminedinasimilarlyarrangedload.3.6.2.2DurationTheloadshallbemaintainedwithintherequiredtemperaturerangeforatimewhichhasbeenpreviouslyshown,bytensiletests,toproducethespecifiedproperties(notrequiredforsoakingtimeswhichhavebeenpreviouslyvalidatedinaccordancewithMIL-H-6088,AMS-H-6088orapreviousissueofAMS2772).RecommendedsoakingtimesarelistedinTable2.3.6.2.3Duringsoakinginasemi-continuousairfurnace,adropintemperatureindicatedbyfurnaceinstrument(s)ispermissibleprovidingthat:3.6.2.3.1Thetemperatureindicatedbyanyinstrumentdoesnotdropmorethan20°F(11°C)belowtheminimumofthespecifiedrange.3.6.2.3.2Timebelowtheminimumofthespecifiedrangedoesnotexceedfiveminutes.3.6.2.3.3Soakingiscontinuedfornotlessthan10minutesafterrecoverytotheminimumofthesolutionheattreatmenttemperaturerangebeforequenching.3.6.2.3.4Iffurnacetemperaturedoesnotdropmorethan20°F(11°C)belowtheminimumofthespecifiedrange,butdoesnotrecovertotheminimumofthespecifiedtemperaturerangewithinfiveminutes,thetotalsoakingtimewithinthespecifiedrangeshallbeincreased;iflessthanonehourwasrequired,itshallbeincreasedbyone-halfhour;ifonehourormorewasrequired,itshallbeincreasedbyonehour.CopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=ParkerHannifin-Categories/5936628103NotforResale,01/25/201009:13:32MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,````,,`,,,`,,,`,,,,,``-`-`,,`,,`,`,,`---SAEAMS2772E-6-3.6.3Quenching(See4.3,8.2.6,and8.2.7)2xxxand7xxxalloyforgingsshallbequenchedbyimmersion.Quenchingofotherformsof2xxxand7xxxalloysandallformsofotheralloysshallbebyimmersion,sprayor,inasuitablechamber,byairblast.3.6.3.1QuenchantForimmersionandsprayquenchingshallbewateroranaqueoussolutionofaresidualstress/distortionreducingadditivesuchaspolymer.3.6.3.2QuenchConditionsQuenchantvolume,velocity,distributionandagitation(ofquenchantand/orproduct)shallbesufficienttoensurethatallproductswillmeetspecifiedrequirementsafteraging.Quenchanttemperatureshallconformto3.6.3.5.Theadditive,concentrationandspecifictemperatureusedforeachloadshallbesupportedbyanalysisofdataverifyingthatthespecifiedpropertiesareachievedafteraging(notrequiredforadditives/concentrations/temperaturespreviouslyvalidinaccordancewithAMS-H-6088,MIL-H-6088,AMS2770orapreviousissueofAMS2772).3.6.3.3QuenchDelayForimmersionquenchingshallconformtoTable3.Forairblastandsprayquenching,maximumallowablequenchdelaysshallbeestablishedbasedontestsoftensilepropertiesand,for2xxxand7xxxsheet,wireandextrusionunder0.250inches(6.35mm)thick,testsforsusceptibilitytointer-granularcorrosion(See4.4.1.2).3.6.3.4RinsingProductheattreatedinsaltbathfurnacesandproductquenchedinanaqueoussolutionofpolymershallberinsedasnecessarytoensurethatitwillbefreefromcorrosionanddetrimentalforeignmaterials3.6.3.5QuenchantTemperature3.6.3.5.1ForgingsandImpactExtrusions3.6.3.5.1.1Quenchant-Water,withorwithoutaNon-PolymerAdditiveRecommendedquenchanttemperaturerangesare140to180°F(60to82°C)for2014and2024alloysand140to160°F(60to71°C)forotheralloysexcept,whenfinaltemperofT41orT61temperisspecified,immersionquenchinginboilingwaterisrequired.3.6.3.5.1.2Quenchant-WaterwithaPolymerAdditiveQuenchanttemperatureshallnotexceed130°F(54°C)atthecompletionofthequench.3.6.3.5.2ImmersionQuenchingofOtherFormsof2xxxand7xxxAlloysIfthequenchantiswateroranaqueoussolutionofanon-polymeradditive,quenchanttemperatureshallnotexceed100°F(38°C)atthestartofquenchand110°F(43°C)atthecompletionofthequench(See3.6.3.7).Ifthequenchantisanaqueoussolutionofpolymer,quenchanttemperatureshallnotexceed130°F(54°C)atthecompletionofthequench.3.6.3.5.3SprayQuenchingofOtherFormsof2xxxand7xxxAlloysThequenchanttemperatureisnotrestrictedbutthequenchanttemperatureusedshallbesupportedbyanalysisofdatainaccordancewith3.6.3.2.CopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=ParkerHannifin-Categories/5936628103NotforResale,01/25/201009:13:32MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,````,,`,,,`,,,`,,,,,``-`-`,,`,,`,`,,`---SAEAMS2772E-7-3.6.3.6SaltContaminationinAqueousSolutionsofAdditivesWhenanaqueoussolutionofadditiveisusedforquenchingproductheattreatedinasaltbathfurnace,saltcontaminationinthequenchantshallnotexceed6%byweight.3.6.3.7ImmersionQuenchCompletionProductunder0.250inch(6.35mm)inthicknessshallremaininthequenchantatleastuntilboilingemanatingfromtheproduct(nottherack)ceases.Product0.250inch(6.35mm)andoverinthicknessshallremaininthequenchantfornotlessthantwominutesperinch(25mm)ofthickness,orfractionthereof,orfornotlessthantwominutesafterboilingceases.3.6.3.8OtherQuenchCompletionProductquenchedbysprayorairblastshallremainincontactwiththequenchantuntilthetemperatureoftheproductisbelowtheboilingpointofwater.3.6.4RestrictionsonAlcladProducts3.6.4.1Heat-UpTimeThetimerequiredforsheetmaterialtoreachtheminimumofthespecifiedtemperaturerangeshallnotexceed30minutesforthicknessesupto0.049inch(1.24mm),60minutesforthicknessesfrom0.050to0.101inch(1.27to2.57mm)and120minutesforthickersheetorforplate.3.6.4.2SoakingTimeToensurealllotswilldevelopspecifiedpropertiesafteraging,soakingtimeshallbeestablishedinaccordancewith3.6.2.However,thetotalsoakingtimeusedforanylot(singleormultiplesolutionheattreatments)shouldbelimitedtotheminimumnecessarytoensurethattheproductwillmeetthespecifiedrequirements.3.6.4.3Re-SolutionHeatTreatmentofAlclad2xxxand7xxxSheetandPlateProductthinnerthan0.020inch(0.51mm)shallnotbere-solutionheattreated.Sheetthicknessesfrom0.020to0.125inch(0.51to3.18mm)inclusiveshallnotbere-solutionheattreatedmorethanonce.Productthickerthan0.125inch(3.18mm)shallnotbere-solutionheattreatedmorethantwice.3.6.4.4Therestrictionsof3.6.4.1and3.6.4.3arenotapplicabletoanylotofproductwhichistestedtoensureconformancetothealcladthicknessrequirementofthematerialspecification.3.7Aging3.7.1RecommendedagingtemperaturesandtimesareshowninTable4.Alternatetemperaturesandtimesmaybeusedprovidedtheagedmaterialmeetsthespecifiedrequirements.3.8TemperConversion3.8.1Whenawarehouse,distributororsimilarorganization,oritsvendor,convertsrawmaterialtoadifferenttemperinaccordancewiththisspecificationorAMS-H-6088orMIL-H-6088,thefollowingprovisionsshallapply:3.8.1.1Theheattreatmentoftherawmaterialandanyheattreatmentofsamplesforheat-treatment-responsetestsshallconformtothetechnicalrequirementsandqualityassuranceprovisionsofAMS2770.ForproductsnotincludedintheTablesinAMS2770,thetemperaturesandtimesofTables5or6shallbeused.3.8.1.2Theconvertedproductshallbetestedinaccordancewiththerequirementsoftheapplicablematerialspecification.CopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=ParkerHannifin-Categories/5936628103NotforResale,01/25/201009:13:32MSTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,````,,`,,,`,,,`,,,,,``-`-`,,`,,`,`,,`---SAEAMS2772E-8-3.8.1.3Anyoriginalmillmarksshallberemovedandtheproductshallbere-identifiedinaccordancewithASTMB666/B666M;thenewidentificationshallensuretraceabilitytothewarehouse/distributor’srecordsshowingtheoriginalproducer,thelotnumberandtheconvertingorganization.3.8.1.4Thereporttothepurchasershallincludecertificationofconversiontothenewtemper,theconversionheattreatmentprocedure,thetestresultsfortheconvertedproductandtheoriginalmillcertification.3.9ProcedureforResponse-to-Heat-TreatmentTestsWhenamaterialspecificationorotherprocurementdocumentrequiresheattreatmentofsamplestodemonstrateresponsetouserheattreatment(e.g.,heattreatmentof-Oor-Ftempermaterialto-T42or-T62temper),theprocedureusedbyproducers,forgeshopsorwarehouses/distributorsandtheirvendorsshallincludeconformancetothemandatorysettemperaturesandtimesinTables5and6(See4.5.1).3.10RecommendedAnnealingTimes,TemperaturesandCoolingRates3.10.11xxx,3xxx,and5xxxSeriesAlloysExcept3003Heatto650°F(343°C);coolingrateoptional.3.10.23003AlloyHeatto775°F(413°C);coolingrateoptional.3.10.32xxxand6xxxSeriesAlloysExcept6013Soakfortwotothreehoursat760°F(404°C);coolatrateof50°F(28°C)perhourorslowerto500°F(260°C);furthercoolingrateoptional.3.10.46013AlloySoakfortwotothreehoursat775°F(413°C);coolatrateof50°F(28°C)perhourorslowerto500°F(260°C);furthercoolingrateoptional.3.10.57xxxSeriesAlloysSoakfortwotothreehoursat760°F(404°C);coolto400°F(204°C)orlower,reheatto450°F(232°C),andsoakforfourhours;coolingrateoptional.3.11Processingto-O1TemperShallconsistofheatingproducttothetemperaturerangeshowninTable1followedbyanaircool.3.12P