Designation:A455/A455M−12AStandardSpecificationforPressureVesselPlates,CarbonSteel,High-StrengthManganese1ThisstandardisissuedunderthefixeddesignationA455/A455M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecification2covershigh-tensilestrengthcarbon-manganesesteelplatesintendedforweldedpressurevessels.1.2Thissteelisusuallymadetoasemi-killedorcappeddeoxidationpractice;however,atthepurchaser’sorthesteelproducer’soption,thesteelmaybemadesilicon-killedoraluminum-killed.1.3Themaximumthicknessofplatesfurnishedunderthisspecificationshallbe3⁄4in.[20mm].1.4Forplatesproducedfromcoilandfurnishedwithoutheattreatmentorwithstressrelievingonly,theadditionalrequirements,includingadditionaltestingrequirementsandthereportingofadditionaltestresults,ofSpecificationA20/A20Mapply.1.5Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecifi-cation.2.ReferencedDocuments2.1ASTMStandards:3A20/A20MSpecificationforGeneralRequirementsforSteelPlatesforPressureVessels3.GeneralRequirementsandOrderingInformation3.1MaterialsuppliedtothismaterialspecificationshallconformtoSpecificationA20/A20M.Theserequirementsout-linethetestingandretestingmethodsandprocedures,permit-tedvariationsindimensions,andmass,qualityandrepairofdefects,marking,loading,andorderinginformation.3.2Inadditiontothebasicrequirementsofthisspecification,certainsupplementaryrequirementsareavailablewhenadditionalcontrol,testing,orexaminationisrequiredtomeetenduserequirements.Thepurchaserisreferredtothelistedsupplementaryrequirementsinthisspecificationandtothedetaile...
