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1、ENGINEERINGMaterialSpecificationGM6412MSTANDARDSMetalsAluminumSheetforBodyandClosurePanelApplicationstersEorUtodesignatethesurfacequalityas1Scopeeitherexposedorunexposed,respectively.ThecapitalletterHdesignatesanagehardenable1.1MaterialDescription.Thespecificationco
2、v-grade.ThecapitalletterNdesignatesanon-ageerstherequirementsforwroughtaluminumalloyhardenable(strain-hardeningonly)grade.GradessheetforuseasautomotivebodyandclosuresdesignatedwiththeletterHarerequiredtoattainpanels.Typicalapplicationsincludehoodsandaminimumpaintbak
3、eresponseof70MPafol-lift-gates.Thisspecificationisapplicabletotwoolowing2%pre-strainandbaking@175Ctypesofwroughtaluminumalloys;ageharde-o(350F)for30minutes.Thepaintbakeresponsenableandnon-agehardenable.Agehardenableisdefinedastheminimumincreaseinyield(e.g.,6000serie
4、s)aluminumalloyscanbeused--`,,,`,`-`-`,,`,,`,`,,`---forexposedandunexposedapplications.DuetostrengthduetoagehardeningfromasimulatedE-coatpaintbakecyclefollowing2%pre-strain.surfacecharacteristics,non-agehardenable(e.g.,GradesdesignatedwiththeletterNarestrain5000seri
5、es)alloysmaynotbesuitableforex-hardenableonlyandthereforedonothaveaposedapplications.paintbakeresponserequirement.ThegradeNote:Exposingworkhardened5000seriesalu-compositionnumber(1,2,3,4or5)designatesminumalloyscontainingmorethanabout3%theAluminumAssociation(AA)comp
6、ositionlimitoomagnesiumtotemperaturesabove66C(150F)thatthegradeisassociatedwithasfollows:mayresultinsusceptibilitytoStressCorrosionCracking.Therefore,non-agehardenable,5000GradeCompositionNumberAssociatedAAseriesaluminumalloygradesinthisspecificationCompositionmayno
7、tbesuitableforpanelsthatareexposed1AA5182toaboveambienttemperatures.Agehardenablealuminumalloysattainanin-2AA6111creaseinstrengthduetostrainhardeningand3AA5754acceleratedaging(precipitationhardening)whensubjectedtotheassemblyplantpaintbakecycle.4AA6022Non-agehardena
8、blealuminumalloysincreaseinstrengthduetostrainhardeningonly,andwill5TBDshowsomedecreaseinstrengthfollowingtheForexample,GM6412MAL115H2Espe
