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SAETechnicalStandardsBoardRulesprovidethat:“ThisreportispublishedbySAEtoadvancethestateoftechnicalandengineeringsciences.Theuseofthisreportisentirelyvoluntary,anditsapplicabilityandsuitabilityforanyparticularuse,includinganypatentinfringementarisingtherefrom,isthesoleresponsibilityoftheuser.”SAEreviewseachtechnicalreportatleasteveryfiveyearsatwhichtimeitmaybereaffirmed,revised,orcancelled.SAEinvitesyourwrittencommentsandsuggestions.Copyright©2003SAEInternationalAllrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystemortransmitted,inanyformorbyanymeans,electronic,mechanical,photocopying,recording,orotherwise,withoutthepriorwrittenpermissionofSAE.TOPLACEADOCUMENTORDER:Tel:877-606-7323(insideUSAandCanada)Tel:724-776-4970(outsideUSA)Fax:724-776-0790Email:custsvc@sae.orgSAEWEBADDRESS:(0.38-0.43C)(SAE4340)(CompositionsimilartoUNSG43406)1.SCOPE:1.1Form:Thisspecificationcoversanaircraft-quality,low-alloysteelintheformofbars,forgings,mechanicaltubing,andforgingstock.1.2Application:Theseproductshavebeenusedtypicallyforparts,3.5inchesandunderinnominalthicknessattimeofheattreatment,requiringathrough-hardeningsteelcapableofdevelopingaminimumhardnessof40HRCwhenproperlyhardenedandtemperedandalsoforpartsofgreaterthicknessbutrequiringproportionatelylowerhardness,butusageisnotlimitedtosuchapplications.1.2.1Certaindesignandprocessingproceduresmaycausetheseproductstobecomesusceptibletostress-corrosioncrackingafterheattreatment;ARP1110recommendspracticestominimizesuchconditions.2.APPLICABLEDOCUMENTS:Theissueofthefollowingdocumentsineffectonthedateofthepurchaseorderformsapartofthisspecificationtotheextentsuppliedherein.Thesuppliermayworktoasubsequentrevisionofadocumentunlessaspecificdocumentissueisspecified.Whenthereferenceddocumenthasbeencancelledandnosupersedingdocumenthasbeenspecified,thelastpublishedissueofthatdocumentshallapply.AEROSPACEMATERIALSPECIFICATIONAMS6415RIssuedJAN1940RevisedJUN2003SupersedingAMS6415PCopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=MessierDowty/5905381001NotforResale,10/11/200522:09:59MDTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,`,`,,,,,`,`,,``,,,``,,-`-`,,`,,`,`,,`---AMS6415RSAEAMS6415R-2-2.1SAEPublications:AvailablefromSAE,400CommonwealthDrive,Warrendale,PA15096-0001or:AvailablefromASTM,100BarrHarborDrive,WestConshohocken,PA19428-2959or:3.1Composition:ShallconformtothepercentagesbyweightshowninTable1,determinedbywetchemicalmethodsinaccordancewithASTME350,byspectrochemicalmethods,orbyotheranalyticalmethodsacceptabletopurchaser.CopyrightSAEInternationalProvidedbyIHSunderlicensewithSAELicensee=MessierDowty/5905381001NotforResale,10/11/200522:09:59MDTNoreproductionornetworkingpermittedwithoutlicensefromIHS--``,,``,`,`,,,,,`,`,,``,,,``,,-`-`,,`,,`,`,,`---AMS6415RSAEAMS6415R-3-3.1.1CheckAnalysis:CompositionvariationsshallmeettheapplicablerequirementsofAMS2259.3.2Condition:Theproductshallbesuppliedinthefollowingcondition;hardnessandtensilestrengthshallbedeterminedinaccordancewithASTMA370.3.2.1Bars:3.2.1.1Bars0.500InchandUnderinNominalDiameterorLeastDistanceBetweenParallelSides:Coldfinishedhavingtensilestrengthnothigherthan125ksiorhardnessnothigherthan27HRC,orequivalent(See8.2).3.2.1.2BarsOver0.500InchinNominalDiameterorLeastDistanceBetweenParallelSides:Hotfinishedandannealed,unlessotherwiseordered,havinghardnessnothigherthan235HB,orequivalent(See8.2).Barsorderedcoldfinishedmayhavehardnessashighas255HB,orequivalent(See8.2).3.2.2Forgings:NormalizedandtemperedinaccordancewithAMS-H-6875toahardnessnothigherthan269HB,orequivalent(See8.2).3.2.3MechanicalTubing:Coldfinished,unlessotherwiseordered,havinghardnessnothigherthan25HRC,orequivalent(See8.2).Tubingorderedhotfinishedandannealedshallhavehardnessnothigherthan99HRB,orequivalent(See8.2).3.2.4Forging