Designation:A710/A710M−02(Reapproved2013)StandardSpecificationforPrecipitation–StrengthenedLow-CarbonNickel-Copper-Chromium-Molybdenum-ColumbiumAlloyStructuralSteelPlates1ThisstandardisissuedunderthefixeddesignationA710/A710M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thisspecificationcoverslow-carbonprecipitation—strengthenednickel-copper-chromium-molybdenum-columbiumalloysteelplatesforgeneralapplications.Thealloysinthisspecificationarestrengthenedbyprecipitationinvarioustemperatureranges.Precipitationstrengtheningcanoccuruponaircoolingafterhotrolling,duringnormalizing,andbyanotherheattreatment.Thesegradesarenotintendedforuseinapplicationsabove900°F[540°C].1.2Twogrades,eachwiththreeclasses,areprovidedasfollows:GradeandClassConditionGradeA,Class1as-rolledandprecipitationheattreatedGradeA,Class2normalizedandprecipitationheattreatedGradeA,Class3quenchedandprecipitationheattreatedGradeB,Class1as-rolledGradeB,Class2normalizedGradeB,Class3normalizedandprecipitationheattreated1.3GradeAprovidesminimumyieldstrengthlevelsrang-ingfrom50to85ksi[345to585MPa],dependingonthicknessandcondition.1.4GradeA,Class1,platesarelimitedtoamaximumthicknessof3⁄4in.[20mm].ThemaximumthicknessofGradeA,Classes2and3,islimitedonlybythecapacityofthecompositiontomeetthespecifiedmechanicalpropertyrequire-ments;however,currentpracticenormallylimitsthemaximumthicknessto8in.[200mm].1.5MandatorynotchtoughnessrequirementsarespecifiedforGradeA,Class1.1.6GradeBprovidesminimumyieldstrengthlevelsrang-ingfrom70to75ksi[480to515MPa],dependingonthicknessandcondition.1.7GradeBplatesarelimitedtoamaximumthicknessof2in.[50mm].1.8MandatorynotchtoughnessrequirementsarespecifiedforthethreeclassesofGradeB.1.9Whenthesteelistobe...
