AMS-QQ-C-320-(2)

SAETechnicalStandardsBoardRulesprovidethat:“ThisreportispublishedbySAEtoadvancethestateoftechnicalandengineeringsciences.Theuseofthisreportisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesoleresponsibilityoftheuser.”SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhichtimeitmaybereaffirmed,revised,orcancelled.SAEinvitesyourwrittencommentsandsuggestions.Copyright2000SocietyofAutomotiveEngineers,Inc.Allrightsreserved.PrintedinU.S.A.QUESTIONSREGARDINGTHISDOCUMENT:[phone]FAX:[phone]TOPLACEADOCUMENTORDER:[phone]FAX:[phone]SAEWEBADDRESS:(Electrodeposited)NOTICEThisdocumenthasbeentakendirectlyfromU.S.MilitarySpecificationQQ-C-320B,Amendment4andcontainsonlyminoreditorialandformatchangesrequiredtobringitintoconformancewiththepublishingrequirementsofSAEtechnicalstandards.TheinitialreleaseofthisdocumentisintendedtoreplaceQQ-C-320B,Amendment4.Anypartnumbersestablishedbytheoriginalspecificationremainunchanged.TheoriginalMilitarySpecificationwasadoptedasanSAEstandardundertheprovisionsoftheSAETechnicalStandardsBoard(TSB)RulesandRegulations(TSB001)pertainingtoacceleratedadoptionofgovernmentspecificationsandstandards.TSBrulesprovidefor(a)thepublicationofportionsofunrevisedgovernmentspecificationsandstandardswithoutconsensusvotingattheSAECommitteelevel,and(b)theuseoftheexistinggovernmentspecificationorstandardformat.UnderDepartmentofDefensepoliciesandprocedures,anyqualificationrequirementsandassociatedqualifiedproductslistsaremandatoryforDODcontracts.Anyrequirementrelatingtoqualifiedproductslists(QPL’s)hasnotbeenadoptedbySAEandisnotpartofthisSAEtechnicaldocument.CopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=MessierDowty/5905381001NotforResale,10/11/200522:08:34MDTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,`,`,,,,,`,`,,``,,,``,,-`-`,,`,,`,`,,`---AMS-QQ-C-320SAEAMS-QQ-C-320-2-1.SCOPEANDCLASSIFICATION:1.1Scope:Thisspecificationcoverstherequirementsforelectrodepositedchromiumplating.1.2Classification:1.2.1Classes:Electrodepositedchromiumplatingshallbeofthefollowingclasses,asspecified(see6.2):Class1-Corrosionprotectiveplating(see3.3.1)Class2-Engineeringplating(see3.3.2)1.2.2Finish:Class1platingshallbeofthefollowingtypesoffinish,asspecified(see6.2):TypeI-BrightfinishTypeII-Satinfinish2.APPLICABLEDOCUMENTS:Thefollowingspecificationsandstandardsformapartofthisdocumenttotheextentspecifiedherein.2.1U.S.GovernmentPublications:AvailablefromDODSSP,SubscriptionServicesDesk,Building4D,700RobbinsAvenue,Philadelphia,PA19111-5094.QQ-N-290NickelPlating(Electrodeposited)MIL-S-5000Steel,Chrome-Nickel-Molybdenum,(E4340),BarsandReforgingStockMIL-S-5002SurfaceTreatmentsandInorganicCoatingsforMetalSurfacesofWeaponsSystemsMIL-S-13165ShotPeeningofFerrousPartsMIL-R-81841RotaryFlapPeeningofMetalPartsMIL-STD-105SamplingProceduresandTablesforInspectionbyAttributesMIL-STD-1312Fasteners,TestMethodsCopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=MessierDowty/5905381001NotforResale,10/11/200522:08:34MDTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,`,`,,,,,`,`,,``,,,``,,-`-`,,`,,`,`,,`---AMS-QQ-C-320SAEAMS-QQ-C-320-3-2.2ASTMPublications:AvailablefromASTM,100BarrHarborDrive,WestConshohocken,PA19428-2959.ASTMB-487MeasurementofMetalandOxideCoatingThicknessbyMicroscopicExaminationofaCrossSectionASTMB-499MeasurementofCoatingThicknessesbytheMagneticMethod:NonmagneticCoatingsonMagneticBasisMetalsASTMB-504MeasuringtheThicknessofMetallicCoatingsbytheCoulometricMethodASTMB-556ThinChromiumCoatingsbytheSpotTest,GuidelineforMeasurementofASTMB-578MeasurementofMicrohardnessofElectrplatedCoatingsASTME-8TensionTestingofMetallicMaterials3.REQUIREMENTS:3.1Materials:Thematerialsusedshallbesuchastoproduceplatingswhichmeettherequirementsofthisspecification.3.2Generalrequirements:3.2.1Hightensilesteelparts:Unlessotherwisespecified(see6.2),steelpartshavinganultimatetensilestrengthgreaterthan240,000psi(1655MPa)shallnotbeplatedwithoutspecificapprovaloftheprocuringactivity.3.2.2Stressrelieftreatment:Allsteelpartshavinganultimatetensilestrengthof150,000psi(1034MPa)andabove,whicharemachined,ground,coldformedorcoldstraightened,shallbebakedataminimumof375±25°F(191±14°C)forthreehoursormorepriortocleaningandplatingforthereliefofdamagingresidualtensilestresses.Whenpeeningisrequired(see3.3.2.3and3.3.2.5),thermalstressreliefshallbeperformedpriortoshotorrotaryflappeening.3.2.3Cleaning:Unlessotherwisespecified(see6.2),allsteelpartsshallbecleanedinaccordancewithMIL-S-5002.Otherbasismetalsshallbecleanedbymethodswhichshallnotdamagethesubstrateandshallnotinterferewithadhesionofthedeposit.3.2.4Platingapplication:Unlessotherwisespecified(see6.2),theplatingshallbeappliedafterallbasismetalheattreatmentsandmechanicaloperations,suchasmachining,brazing,welding,formingandperforatingofthearticle,have