Designation:A542/A542M−13StandardSpecificationforPressureVesselPlates,AlloySteel,Quenched-and-Tempered,Chromium-Molybdenum,andChromium-Molybdenum-Vanadium1ThisstandardisissuedunderthefixeddesignationA542/A542M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecification2coverstwotypesof21⁄4Cr-1MoandthreetypesofCr-Mo-Valloysteelplatesforuseinthequenched-and-temperedcondition,intendedforthefabricationofweldedpressurevesselsandcomponents.1.2Materialunderthisspecificationisavailableinfivetypes,designated“A,”“B,”“C,”“D,”and“E.”TypeBisidenticaltoTypeAexceptforrestrictivelimitsforcarbon,phosphorus,sulfur,andnickel.Thematerialisalsoavailableinfiveclasseshavingthefollowingstrengthlevels.TypeEisavailableonlyasClass4and4a.ClassMinimumTensileStrength,ksi[MPa]1105[725]2115[795]395[655]4and4a85[585]1.3Themaximumthicknessofplatesislimitedonlybythecapacityofthechemicalcompositiontomeetthespecifiedmechanicalpropertyrequirements.1.4Theminimumthicknessofplatesislimitedto3⁄16in.[5mm].1.5Thematerialisintendedtobesuitableforfusionwelding.Weldingtechniqueisoffundamentalimportanceanditispresupposedthatweldingprocedureswillbeinaccordancewithapprovedmethods.1.6Thesealloysteelplatesintheas-rolledconditionaresensitivetocrackingduringflamecutting,transit,andhan-dling.Theyshouldbeshippedintheas-rolledconditiononlywiththemutualagreementofthemanufacturerandthepurchaserorfabricator.1.7Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents,therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththisspecifi-cation.2.ReferencedDocuments2.1ASTMStandards:3A20/A20MSpecificationforGeneralRequ...
