hastelloy-c-276哈氏合金C276

CORROSION-RESISTANTALLOYSHASTELLOY®C-276ALLOYExcellentcorrosion-resistancetobothoxidizingandreducingmediaandexcellentresistancetolocalizedcorrosionattack.ContentsPrincipalFeatures3ChemicalComposition3PhysicalProperties4DynamicModulusofElasticity4Formability4ImpactStrength5TensileData5Hardness5AqueousCorrosionData6LocalizedCorrosionData8IsocorrosionDiagrams11Availability15SalesOfficeAddresses16H-2002CHastelloyC-276Alloy/H-2002C1/2/0012:42PMPage22HASTELLOY®:THENAMETOTRUSTInaggressive/corrosiveservice,whennothingelseworks,manyindustrieshavetraditionallyturnedtoHASTELLOY®C-276alloy.Manyyearsofoutstandingperformanceinavarietyofindustrialapplicationshaveconfirmedtheadvantagesofusingthealloy.Materialsengineersinthechemicalprocessingandotherindustrieshavegrownaccustomedtospecifyingitshighperformancebasedonlaboratorytesting,fieldtrialsand/orpriorexperience.Some“generic”alloyN10276productsfailtomeasureuptotheperformanceindustryexpectsfromHASTELLOYC-276alloywhichisproducedviaexactingprocesses,andbackedbyyearsofexperienceinchemistrycontrol,thermal-mechanicalprocessing,testingandqualificationstorigidstandards.1ASTMG-28A=50%H2SO4+42g/lFe2(SO4)3(Boiling)2ASTMG-28B=23%H2SO4+1.2%HCl+1%Fe2Cl3+1%CuCl2(Boiling)3GREENDEATH=11.5%H2SO4+1.2%HCl+1%Fe2Cl3+1%CuCl2(Boiling)WhenthealloyisspecifiedbytheUNSNumber,discerningquestionsshouldbeaskedforassuranceofHASTELLOYC-276alloyperformance:•Doestheproductpossesstheclean,homogeneousmicrostructuresoimportantforgoodresistancetoaqueouscorrosion?•Howdoestheproductperformintoughenvironments(e.g.,rigorouspittingconditions)forwhichthismaterialismostoftenspecified?•Isthecorrosionresistanceoftheweldedproduct,inadiscriminatingtest,uptopar?©1997byHaynesInternational,Inc.HASTELLOY®C-276alloyASTMG-28BGREEN-DEATHASTMG-28BGREENDEATHUNSN10276(SOURCEX)MILLANNEALED373MPY2752MPY1535MPYPITTINGHASTELLOY®C-276ALLOYMILLANNEALED238MPY49MPY24MPYNOATTACKASTMG-28A1ASTMG-28B2GREENDEATH3HastelloyC-276Alloy/H-2002C1/2/0012:42PMPage3HASTELLOY®C-276alloy3PRINCIPALFEATURESNOMINALCHEMICALCOMPOSITION,(CONSISTSOFABOUT)WEIGHTPERCENT*ExcellentResistancetoCorrosionHASTELLOY®C-276alloyisanickel-molybdenum-chromiumwroughtalloythatisgenerallyconsideredaversatilecorrosion-resistantalloy.C-276alloyisanimprovedwroughtversionofalloyCinthatitusuallydoesn’tneedtobesolutionheat-treatedafterweldingandhasvastlyimprovedfabricability.Thisalloyresiststheformationofgrain-boundaryprecipitatesintheweldheat-affectedzone,thusmakingitsuitableformostchemicalprocessapplicationsintheas-weldedcondition.However,inenvironmentswhereattackoftheC-276alloyweldjointisexperienced,C-22®weldfillermaterialsshouldbeconsidered(Seepage14).C-276alloyhasexcellentresistancetolocalizedcorrosionandtobothoxidizingandreducingmedia.Becauseofitsversatility,C-276alloycanbeusedwhere“upset”conditionsarelikelytooccurorinmultipurposeplants.HASTELLOYC-276alloyhasexcellentresistancetoawidevarietyofchemicalprocessenvironments,includingstrongoxidizerssuchasferricandcupricchlorides,hotcontaminatedmedia(organicandinorganic),chlorine,formicandaceticacids,aceticanhydride,andseawaterandbrinesolutions.Itisusedinfluegasdesulfurizationsystemsbecauseofitsexcellentresistancetosulfurcompoundsandchlorideionsencounteredinmostscrubbers.C-276alloyhasexcellentresistancetopittingandtostress-corrosioncracking.Itisalsooneofthefewmaterialsthatwithstandsthecorrosiveeffectsofwetchlorinegas,hypochloriteandchlorinedioxide.FabricatedbyaVarietyofMethodsHASTELLOYC-276alloycanbeforged,hot-upsetandimpactextruded.Althoughthealloytendstowork-harden,itcanbesuccessfullydeep-drawn,spun,pressformedorpunched.AllofthecommonmethodsofweldingcanbeusedtoweldHASTELLOYC-276alloy,althoughtheoxyacetyleneandsubmergedarcprocessesarenotrecommendedwhenthefabricateditemisintendedforuseincorrosionservice.Specialprecautionsshouldbetakentoavoidexcessiveheatin-put.Detailedfabricatinginformationisavailableinthebooklet,“FabricationofHAYNES®Corrosion-ResistantAlloys.”AskforbookletH-2010.AvailableinWroughtFormHASTELLOYC-276alloyisavailableintheformofplate,sheet,strip,billet,bar,wire,coveredelectrodes,pipe,tubing,pipefittings,flangesandfittings.Heat-TreatmentWroughtformsofHASTELLOYC-276alloyarefurnishedinthesolutionheat-treatedconditionunlessotherwisespecified.C-276alloyisnormallysolutionheat-treatedat2050°F(1121°C)andrapidquenched.Partswhichhavebeenhot-formedshouldbesolutionheat-treatedpriortofinalfabricationorinstallation,ifpossible.ASMEBoilerandPressureVesselCodeHASTELLOYC-276alloyplate,sheet,strip,bar,tubingandpipearecoveredbyASMEspecificationsSB-574,SB-575,SB-619,SB-622andSB-626underUNSnumberN10276.NiCoCrMoWFeSiMnCOthers572.5**14.5-15.0-3.0-4.0-0.08**1.0**0.01**V-0.35**16.517.04.57.0P-0.025S-0.010***TheundiluteddepositedchemicalcompositionofalloyC-276coveredelectrodeshas0.02percentmaximumcarbon,0.20percentmaximumsilicon,0.03percentmaximumphosphorusand0.015percentmaximumsulfur.**MaximumHastelloyC-276Alloy/H-2002C1/2/0012:42PMPage6HASTELLOY®C-276alloy4AVERAGEPHYSICALPROPERTIESAVERAGEDYNAMICMODULUSOFELASTICITYFORMABILITYPhysicalPropertyTem