ASTM-A997-2008

Designation:A997−08(Reapproved2012)StandardPracticeforInvestmentCastings,SurfaceAcceptanceStandards,VisualExamination1ThisstandardisissuedunderthefixeddesignationA997;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstheacceptancecriteriaforsurfaceinspectionofinvestmentcastingsbyvisualexamination.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1DefinitionsofTermsSpecifictoThisStandard:2.1.1lineardiscontinuity,n—adiscontinuitywhoselengthisequaltoorgreaterthanthreetimesitswidth.Cracksandcoldshutsareexamplesoflineardiscontinuity.2.1.2positivemetal,n—raisedmetalonthecastingsurfaceusuallyassociatedwiththebreakdownofthemoldanditsreplacementwiththecastingmetal.2.1.3surfacepit,n—anonlineardepressioninthecastsurfacewhoselengthislessthanthreetimesitswidth.Surfacepitsmaybetheresultofgasornonmetallicinclusions.2.1.4surfaceroughness,n—ameasureofsurfacetextureusuallydeterminedbytheuseofacomparator.3.OrderingInformation3.1Theinquiryorordershouldspecifythefollowinginformation:3.1.1AcceptanceLevel—Morethanoneacceptancelevelmaybespecifiedfordifferentsurfacesofthesamecasting(seeSection4),3.1.2Ifanytypesofdiscontinuitiesareunacceptable,3.1.3Castingsurfacestobeexamined,3.1.4Numberofcastingstobeexamined,and3.1.5Additionalacceptancecriteriaasapplicabletoallorportionsofthecastingsurface.4.AcceptanceCriteria4.1LevelsofacceptanceforvisualinspectionarelistedinTable1.4.2Partsshallnotexhibitanylineardiscontinuities.4.3Surfaceroughnessandsurfacepitsthatwillberemovedbymachiningareconsideredacceptable.4.4Surfacediscontinuitiesnotcoveredinthispracticeshallbeamatterofagreementbetweenthepurchaserandthemanufacturer.1ThispracticeisunderthejurisdictionofASTMCommitteeA01onSteel,StainlessSteelandRelatedAlloysandisthedirectresponsibilityofSubcommitteeA01.18onCastings.CurrenteditionapprovedSept.1,2012.PublishedNovember2012.Originallyapprovedin1998.Lastpreviouseditionapprovedin2008asA997–08.DOI:10.1520/A0997-08R12.Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959.UnitedStates1CopyrightASTMInternationalProvidedbyIHSunderlicensewithASTMNotforResaleNoreproductionornetworkingpermittedwithoutlicensefromIHS--`,,```,,,,````-`-`,,`,,`,`,,`---ASTMInternationaltakesnopositionrespectingthevalidityofanypatentrightsassertedinconnectionwithanyitemmentionedinthisstandard.Usersofthisstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtheriskofinfringementofsuchrights,areentirelytheirownresponsibility.Thisstandardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteeandmustbereviewedeveryfiveyearsandifnotrevised,eitherreapprovedorwithdrawn.YourcommentsareinvitedeitherforrevisionofthisstandardorforadditionalstandardsandshouldbeaddressedtoASTMInternationalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommittee,whichyoumayattend.IfyoufeelthatyourcommentshavenotreceivedafairhearingyoushouldmakeyourviewsknowntotheASTMCommitteeonStandards,attheaddressshownbelow.ThisstandardiscopyrightedbyASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.Individualreprints(singleormultiplecopies)ofthisstandardmaybeobtainedbycontactingASTMattheaboveaddressorat610-832-9585(phone),610-832-9555(fax),[e-mail](e-mail);orthroughtheASTMwebsite().PermissionrightstophotocopythestandardmayalsobesecuredfromtheASTMwebsite().TABLE1VisualInspectionAcceptanceCriteriaA,BSurfaceFeatureLevelIILevelIIILevelIVSurfacePitsC,D,E0.030in.(0.76mm)diameterby0.015in.(0.38mm)deepwithnomorethan1perin.2(645mm2)0.060in.(1.52mm)diameterby0.030in.(0.76mm)deepwithnomorethan1perin.2(645mm2)0.060in.(1.52mm)diameterby0.030in.(0.76mm)deepwithnomorethan4perin.2(645mm2)†PositiveMetalD,E0.060in.(1.52mm)diameterby0.015in.(0.38mm)highwithnomorethan1perin.2(645mm2)0.125in.(3.18mm)diameterby0.030in.(0.76mm)highwithnomorethan1perin.2(645mm2)0.125in.(3.18mm)diameterby0.030in.(0.76mm)highwithnomorethan4perin.2(645mm2)PartingLineandEjectorPinMarksHeightorDepthC0.005in.(0.13mm)0.010in.(0.25mm)0.020in.(0.51mm)GateHeightF0.015in.(0.38mm)0.030in.(0.76mm)0.045in.(1.14mm)SurfaceRoughnessE100µin.(2.5µm)125µin.(3.2µm)200µin.(5.0µm)AFeaturesinexcessofthosespecifiedinthetablearenotacceptable.BLevelIcriteriamaybeestablishedinthefuturedependingonneed.CMaximumsurfacepit,partingline,andejectorpinmarkdepthshallnotviolatedrawingminimumwallthickn