Designation:A1066/A1066M−11(Reapproved2015)´1StandardSpecificationforHigh-StrengthLow-AlloyStructuralSteelPlateProducedbyThermo-MechanicalControlledProcess(TMCP)1ThisstandardisissuedunderthefixeddesignationA1066/A1066M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditorialcorrectionsweremadetoTable1inSeptember2015.1.Scope1.1Thisspecificationcoverssteelplatesproducedbythethermo-mechanicalcontrolledprocess(TMCP).Fivegradesaredefinedbytheyieldstrength:50[345],60[415],65[450],70[485],and80[550].Theplatesareintendedprimarilyforuseinweldedsteelstructures.1.2TheTMCPmethodconsistsofrollingreductionsandcoolingratecontrolsthatresultinmechanicalpropertiesinthefinishedplatethatareequivalenttothoseattainedusingconventionalrollingandheattreatmentprocesses,whichentailreheatingafterrolling.AdescriptionoftheTMCPmethodisgiveninAppendixX1.1.3Themaximumthicknessesavailableinthegradescov-eredbythisspecificationareshowninTable1.1.4Duetothespecialcombinationofmechanicalandthermaltreatmentinducinglowerrollingtemperaturesthanforconventionalhotrollingtheplatescannotbeformedatelevatedtemperatureswithoutsustainingsignificantlossesinstrengthandtoughness.Theplatesmaybeformedandpost-weldheat-treatedattemperaturesnotexceeding1050°F[560°C].Highertemperaturesmaybepossibleifproventhatminimummechanicalcharacteristicsareretainedaftertestswithspecimensinthepost-weldheattreatment(PWHT)condition.Forflamestraighteninghighertemperaturescanbeusedinaccordancewiththesteelmanufacturer’srecommen-dations.1.5Ifthesteelistobewelded,aweldingproceduresuitableforthegradeofsteelandintendeduseorserviceistobeutilized.SeeAppendixX3ofSpecificationA6/A6Mforinformationonweldability.1.6Supplementaryrequirementsareavailablebutshallapplyonlyifspecifiedinthepurchaseorder.1.7Thevaluesstatedineitherinch-po...
