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1、Designation:A153A153M?16aAmericanAssociationStateHighwayTransptationOfficialsStardAASHTONo.M232StardSpecificationfZincCoating(HotDip)onIronSteelHardware1ThisstardisissuedunderthefixeddesignationA153A153Mthenumberimmediat

2、elyfollowingthedesignationindicatestheyearofiginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapprova

3、l.ThisstardhasbeenapprovedfusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationcoverszinccoatingsappliedbythehotdipprocessonironsteelhardware.Thehotdipgalvanizingprocessconsistsofpartsbeingimmersedinmolt

4、enzincfasufficienttimetoallowametallurgicalreactionbetweenironfromthesteelsurfacethemoltenzincresultinginthefmationofZnFealloylayersbondingthecoatingtothesteelsurface.1.2Thisspecificationisintendedtobeapplicabletohardwar

5、eitemsthatarecentrifugedotherwisehledtoremoveexcessgalvanizingbathmetal(freezinc).Coatingthicknessgraderequirementsreflectthis.1.3FastenersthatmustcomplywiththeFastenerQualityActrequirespecificstatisticalsamplingduringth

6、einspectionofthefastenerlots.RequirementsfthesamplingofthesefastenerscanbefoundinF2329F2329M.1.4Thisspecificationisapplicabletodersineitherinchpoundunits(asA153)inSIunits(asA153M).InchpoundunitsSIunitsarenotnecessarilyex

7、actequivalents.WithinthetextofthisspecificationwhereappropriateSIunitsareshowninbrackets.Eachsystemshallbeusedindependentlyoftheotherwithoutcombiningvaluesinanyway.InthecaseofdersinSIunitsalltestinginspectionshallbedoneu

8、singthemetricequivalentofthetestinspectionmethodasappropriate.InthecaseofdersinSIunitssuchshallbestatedtothegalvanizerwhenthederisplaced.1.5Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.It

9、istheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2A90A90MTestMethodfWeight[Mass]ofCoatingonIronSt

10、eelArticleswithZincZincAlloyCoatingsA143A143MPracticefSafeguardingAgainstEmbrittlementofHotDipGalvanizedStructuralSteelProductsProcedurefDetectingEmbrittlementA780PracticefRepairofDamagedUncoatedAreasofHotDipGalvanizedCo

11、atingsA902TerminologyRelatingtoMetallicCoatedSteelProductsB6SpecificationfZincB487TestMethodfMeasurementofMetalOxideCoatingThicknessbyMicroscopicalExaminationofCrossSectionB960SpecificationfPrimeWesternGradeRecycled(PWGR

12、)ZincE376PracticefMeasuringCoatingThicknessbyMagicFieldEddyCurrent(Electromagic)TestingMethodsF1470PracticefFastenerSamplingfSpecifiedMechanicalPropertiesPerfmanceInspectionF1789TerminologyfF16MechanicalFastenersF2329F23

13、29MSpecificationfZincCoatingHotDipRequirementsfApplicationtoCarbonAlloySteelBoltsScrewsWashersNutsSpecialThreadedFasteners3.Terminology3.1Definitions:3.1.1Thefollowingtermsdefinitionsarespecifictothisspecification.Termin

14、ologyA902containsothertermsdefinitionsrelatingtometalliccoatedsteelproducts.TerminologyF1789containsothertermsdefinitionsrelatingtomechanicalfasteners.3.2DefinitionsofTermsSpecifictoThisStard:1Thisspecificationisunderthe

15、jurisdictionofASTMCommitteeA05onMetallicCoatedIronSteelProductsisthedirectresponsibilityofSubcommitteeA05.13onStructuralShapesHardwareSpecifications.Currenteditionapproved.PublishedNovember2016.iginallyapprovedin1933.Las

16、tpreviouseditionapprovedin2016asA153A153M16.DOI:10.1520A0153_A0153M16A.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummar

17、ypageontheASTMwebsite.ASummaryofChangessectionappearsattheendofthisstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1piece.Thethicknessoftherepairshallbeequaltothesurroundi

18、nggalvanizedcoatingexceptfrepairsmadebypaintscontainingzincdustinwhichcasethethicknessoftherepairshallbe50%greaterthanthethicknessofthegalvanizedcoatingrequiredftheclassofmaterialbutshallnotbegreaterthan4.0mils[100m].Rep

19、airthicknessmeasurementsshallbemadeinaccdancewithPracticeA780.Thegalvanizershallmakerepairsunlessdirectedbythepurchasertodeliveritemsunrepairedfsubsequentrenovationbythepurchaser.5.WkmanshipFinishAppearance5.1Thezinccoat

20、edarticlesshallbefreefromuncoatedareasblistersfluxdepositsdrossinclusionsothertypesofprojectionsthatwouldinterferewiththeintendeduseofthearticlesotherdefectsnotconsistentwithgoodgalvanizingpractice.5.2Thezinccoatingshall

21、bereasonablysmoothunifminthickness.NOTE2—Smoothnessofsurfaceisarelativeterm.Minroughnessthatdoesnotinterferewiththeintendeduseofthepartroughnessthatisrelatedtotheasreceived(ungalvanized)surfaceconditionofthepartshallnotb

22、egroundsfrejection.NOTE3—Sincethisspecificationisapplicabletoitemsthatarecentrifugedotherwisehledtoremoveexcessbathmetal(see1.2)irregularcoatingdistributionisnotnmallyencountered.Drainageproblemswhichmanifestthemselvesas

23、localexcesscoatingthicknessthatwouldinterferewithfunctionasedgetearsspikesthatpresentasafetyhazardbecauseoftheirsharpnessaregroundsfrejectionunderthetermsof5.1.5.3Embrittlementisapotentialconditionofsteelthatiscoldwkedde

24、pendingonsuchfactsasthesteeltype(strengthlevelagingacteristics)thicknessdegreeofcoldwkgalvanizingprocess.Thegalvanizerthedesignerthefabricatshalltakeprecautionsagainstembrittlement.Theprecautionstofabricateproperlyprepar

25、ethematerialfgalvanizingtopreventembrittlementaredescribedinPracticeA143A143M.NOTE4—Lowservicetemperaturesincreasetheriskofbrittlefailureofallplaincarbonsteelsincludingthosewhichhavebeengalvanized.Thistemperatureembrittl

26、ingeffectvarieswithtypeofsteel.Theexpectedservicetemperatureshouldthusbetakenintoaccountwheningsteelsfgalvanizing.5.4Malleablecastingsshallbeofsuchcompositionaswillprecludethepossibilitythattheybecomeembrittledbythegalva

27、nizingprocesstheyshallbeeithercooledfromtheannealsubsequentlyheattreatedsoastoimmunizethemagainstembrittlement.5.5Thezinccoatingshalladheretenaciouslytothesurfaceofthebasemetal.5.6Ifthegalvanizedmaterialcoveredbythisspec

28、ificationisbentotherwisefabricatedtothedegreethatcausesthezinccoatingstostretchcompressbeyondthelimitofelasticityanycrackingflakingofthecoatingresultingfromthebendingfabricatingshallnotbecausefrejection.5.7Highstrengthbo

29、ltstypicallyover150000lbin.2ultimatetensilestrengthmaybesubjecttohydrogenembrittlement.PracticestosafeguardagainsthydrogenembrittlementaredescribedinSpecificationA143A143M.6.Sampling6.1Testspecimensshallbeedatromfromeach

30、inspectionlot.6.2Themethodofionsamplesizeshallbeagreeduponbetweenthegalvanizerthepurchaser.Otherwisethesamplesizeedfromeachlotshallbeasfollows:NumberofPiecesinLotSampleSize3lessall4to5003501to120051201to320083201to100001

31、310001over206.3Aspecimenthatfailstoconfmtoarequirementofthisspecificationshallnotbeusedtodeterminetheconfmancetootherrequirements.6.4ThemethodofsamplingffastenersthatarerequiredtomeetthestardsoftheFastenerQualityActisdes

32、cribedinGuideF1470.Samplequantitiesdefinitionsofterminologyareincludedinthereferencedspecification.7.TestMethods7.1Testsshallbemadetoensurethatthezinccoatingisbeingfurnishedinaccdancewiththisspecificationasspecifiedfthef

33、ollowing:7.1.1Minimumcoatingweight[mass]minimumcoatingthicknessin4.3.7.1.2Finishappearancein5.15.2.7.1.3Embrittlementin5.35.4.7.1.4Adherencein5.5.7.2AverageWeight[Mass]ofCoating:7.2.1Theaverageweight[mass]ofthezinccoatin

34、gshallbedeterminedbyweighingspecimensafterpicklingdryingagainaftergalvanizingunlessthemethoddescribedin7.2.2isused.ThenumberofspecimensthatareusedtodeterminetheaverageofaninspectionlotshallbederivedfromSection6.NOTE5—Thi

35、smethoddoesnottakeintoaccounttheweight[mass]ofironreactedfromthearticlethatisincpatedintothecoating.Itwillthusunderestimatecoatingweight[mass]byuptoapproximately10%.Basemetalreactivitywillaffecttheextentofunderestimation

36、.7.2.2Inthecaseofmaterialsinspectedaftergalvanizingtheaverageweight[mass]ofcoatingshallbedeterminedbystrippingthenumberofspecimensderivedinSection6inaccdancewithTestMethodA90A90Maveragingtheresultsoftheindividualspecimen

37、sunlessthemethoddescribedin7.2.1isused.7.3AverageThicknessofCoating:7.3.1Inthecaseoffastenerssuchasboltsnutsscrewsthedeterminationofthethicknessofcoatingshallbemadeonaptionofthearticlethatdoesnotincludeanythreads.7.3.2Th

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