Designation:E2868−13StandardDigitalReferenceImagesforSteelCastingsupto2in.(50.8mm)inThickness1ThisstandardisissuedunderthefixeddesignationE2868;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesedigitalreferenceimagesillustratevariouscategories,types,andseveritylevelsofdiscontinuitiesoccur-ringinsteelcastingsthathavesectionthicknessesupto2in.(50.8mm).ThedigitalreferenceimagesareanadjuncttothisstandardandmustbepurchasedseparatelyfromASTMInternational,ifneeded(see2.3).Categoriesandseveritylevelsforeachdiscontinuitytyperepresentedbythesedigitalreferenceimagesaredescribedin1.2.NOTE1—ThebasisofapplicationforthesereferenceimagesrequiresapriorpurchasersupplieragreementofradiographicexaminationattributesandacceptancecriteriaasdescribedinSections4,6,and7ofthisstandard.1.2Thesedigitalreferenceimagesconsistofthreeseparatevolumes(seeNote2)asfollows:(I)mediumvoltage(nominal250-kV)Xrays,(II)1-MVXraysandIridium-192radiation,and(III)2-MVto4-MVXraysandCobalt-60radiation.Unlessotherwisespecifiedinapurchasersupplieragreement(see1.1),eachvolumeisforcomparisononlywithproductiondigitalimagesproducedwithradiationenergylevelswithinthethicknessrangecoveredbythisstandard.Eachvolumeconsistsofsixcategoriesofgradeddiscontinuitiesofincreasingsever-itylevelandfourcategoriesofungradeddiscontinuities.Referenceimagescontainingungradeddiscontinuitiesareprovidedasaguideforrecognitionofaspecificcastingdiscontinuitytypewhereseveritylevelsarenotneeded.Thefollowingisalistofdiscontinuitycategories,types,andseveritylevelsfortheadjunctdigitalreferenceimagesofthisstandard:1.2.1CategoryA–Gasporosity;severitylevels1through5.1.2.2CategoryB–Sandandslaginclusions;severitylevels1through5.1.2.3CategoryC–Shrinkage;4types:1.2.3.1Ca–linearshrinkage–Severitylevels1through5.1.2.3.2Cb–featherys...
