ASTM-A743-2017-一般用耐腐蚀铬铁及镍铬铁合金铸件

Designation:A743/A743M−17StandardSpecificationforCastings,Iron-Chromium,Iron-Chromium-Nickel,CorrosionResistant,forGeneralApplication1ThisstandardisissuedunderthefixeddesignationA743/A743M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoversiron-chromiumandiron-chromium-nickelalloycastingsforgeneralcorrosion-resistantapplication.Thegradescoveredbythisspecificationrepresenttypesofalloycastingssuitableforbroadrangesofapplicationwhichareintendedforawidevarietyofcorrosionenviron-ments.NOTE1—Foralloycastingsforseverecorrosion-resistantservice,referenceshouldbemadetoSpecificationA744/A744M.Forgeneralheat-resistantalloycastings,referenceshouldbemadetoSpecificationA297/A297M.Fornickelalloycastingsforcorrosion-resistantservice,referenceshouldbemadetoSpecificationA494/A494M.1.2Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecifi-cation.Inch-poundunitsareapplicableformaterialorderedtoSpecificationA743andSIunitsformaterialorderedtoSpecificationA743M.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2A262PracticesforDetectingSusceptibilitytoIntergranularAttackinAusteniticStainlessSteelsA297/A297MSpecificationforSteelCastings,Iron-ChromiumandIron-Chromium-Nickel,HeatResistant,forGeneralApplicationA494/A494MSpecificationforCastings,NickelandNickelAlloyA744/A744MSpecificationforCastings,Iron-Chromium-Nickel,CorrosionResistant,forSevereServiceA781/A781MSpecificationforCastings,SteelandAlloy,CommonRequirements,forGeneralIndustrialUseA890/A890MSpecificationforCastings,Iron-Chromium-Nickel-MolybdenumCorrosion-Resistant,Duplex(Austenitic/Ferritic)forGeneralApplicationA957/A957MSpecificationforInvestmentCastings,SteelandAlloy,CommonRequirements,forGeneralIndustrialUse3.GeneralConditionsforDelivery3.1Exceptforinvestmentcastings,castingsfurnishedtothisspecificationshallconformtotherequirementsofSpeci-ficationA781/A781M,includinganysupplementaryrequire-mentsthatareindicatedonthepurchaseorder.FailuretocomplywiththegeneralrequirementsofSpecificationA781/A781Mconstitutesnonconformancewiththisspecification.IncaseofconflictbetweentherequirementsofthisspecificationandSpecificationA781/A781M,thisspecificationshallpre-vail.3.2SteelinvestmentcastingsfurnishedtothisspecificationshallconformtotherequirementsofSpecificationA957/A957M,includinganysupplementaryrequirementsthatareindicatedinthepurchaseorder.FailuretocomplywiththegeneralrequirementsofSpecificationA957/A957Mconsti-tutesnonconformancewiththisspecification.Incaseofcon-flictbetweentherequirementsofthisspecificationandSpeci-ficationA957/A957M,SpecificationA957/A957Mshallprevail.4.OrderingInformation4.1Ordersformaterialtothisspecificationshouldincludethefollowing,asrequired,todescribethematerialadequately:1ThisspecificationisunderthejurisdictionofASTMCommitteeA01onSteel,StainlessSteelandRelatedAlloysandisthedirectresponsibilityofSubcommitteeA01.18onCastings.CurrenteditionapprovedNov.1,2017.PublishedNovember2017.Originallyapprovedin1977.Lastpreviouseditionapprovedin2014asA743/A743M–13aɛ1.DOI:10.1520/A0743_A0743M-17.2ForreferencedASTMstandards,visittheASTMwebsite,@astm.org.ForAnnualBookofASTMStandardsvolumeinformation,refertothestandard’sDocumentSummarypageontheASTMwebsite.*ASummaryofChangessectionappearsattheendofthisstandardCopyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959.UnitedStatesThisinternationalstandardwasdevelopedinaccordancewithinternationallyrecognizedprinciplesonstandardizationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecommendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.14.1.1Descriptionofthecastingbypatternnumberordrawing,4.1.2Grade,4.1.3Heattreatment,4.1.4Optionsinthespecification,4.1.5Whethercastingsaretobeproducedusingtheinvest-mentcastingprocess,and4.1.6Supplementaryrequirementsdesired,includingthestandardsofacceptance.5.Process5.1Thesteelshallbemadebytheelectricfurnaceprocesswithorwithoutseparaterefiningsuchasargon-oxygendecar-burization(AOD).6.HeatTreatment6.1CastingsshallbeheattreatedinaccordancewiththerequirementsinTable1.NOTE2—Properheattreatmentofthesealloysisusuallynecessarytoenhancecorrosionresistanceandinsomecasestomee