Designation:A1048/A1048M−06(Reapproved2011)StandardSpecificationforPressureVesselForgings,AlloySteel,HigherStrengthChromium-Molybdenum-TungstenforElevatedTemperatureService1ThisstandardisissuedunderthefixeddesignationA1048/A1048M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoverschromium-molybdenum-tungstenalloysteelforgingsintendedprimarilyforuseinboilersandpressurevesselsforelevatedtemperatureservice.1.1.1Elevatedtemperaturesaretemperaturesintherangewherecreepandstressrupturepropertiesareimportantforthealloysteelsinthisspecification.1.2SupplementaryrequirementsareprovidedbothinthisspecificationandintheGeneralRequirementsSpecificationA788/A788Mforusewhenadditionaltestingorinspectionisdesired.Theseshallapplyonlywhenspecifiedindividuallybythepurchaserinthepurchaseorderorcontract.1.3Unlesstheorderspecifiestheapplicable“M”specifica-tiondesignation,theforgingsshallbesuppliedtotheinch-poundunits.1.4Thevaluesstatedineitherinch-poundorSI(metric)unitsaretoberegardedseparatelyasstandard.Withinthetextandtables,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecification.2.ReferencedDocuments2.1ASTMStandards:2A275/A275MPracticeforMagneticParticleExaminationofSteelForgingsA388/A388MPracticeforUltrasonicExaminationofSteelForgingsA788/A788MSpecificationforSteelForgings,GeneralRe-quirementsA966/A966MPracticeforMagneticParticleExaminationofSteelForgingsUsingAlternatingCurrent3.OrderingInformationandGeneralRequirements3.1InadditiontotheorderinginformationrequiredbySpecificationA788/A788M,thepurchasershouldincludewiththeinquiryandorderthefollowinginformation:3.1.1Adrawing,sketch,orwrittendesc...
