Designation:A709/A709M−16aStandardSpecificationforStructuralSteelforBridges1ThisstandardisissuedunderthefixeddesignationA709/A709M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoverscarbonandhigh-strengthlow-alloysteelstructuralshapes,plates,andbarsandquenchedandtemperedalloysteelforstructuralplatesintendedforuseinbridges.Sevengradesareavailableinfouryieldstrengthlevelsasfollows:GradeU.S.[SI]YieldStrength,ksi[MPa]36[250]36[250]50[345]50[345]50S[345S]50[345]50W[345W]50[345]HPS50W[HPS345W]50[345]HPS70W[HPS485W]70[485]HPS100W[HPS690W]100[690]1.1.1Grades36[250],50[345],50S[345S],and50W[345W]arealsoincludedinSpecificationsA36/A36M,A572/A572M,A992/A992M,andA588/A588M,respectively.WhentherequirementsofTable9orTable10orthesupplementaryrequirementsofthisspecificationarespecified,theyexceedtherequirementsofSpecificationsA36/A36M,A572/A572M,A992/A992M,andA588/A588M.1.1.2Grades50W[345W],HPS50W[HPS345W],HPS70W[HPS485W],andHPS100W[HPS690W]haveen-hancedatmosphericcorrosionresistance(see13.1.2).ProductavailabilityisshowninTable1.1.2GradeHPS70W[HPS485W]orHPS100W[HPS690W]shallnotbesubstitutedforGrades36[250],50[345],50S[345S],50W[345W],orHPS50W[HPS345W].Grade50W[345W],orHPS50W[HPS345W]shallnotbesubsti-tutedforGrades36[250],50[345]or50S[345S]withoutagreementbetweenthepurchaserandthesupplier.1.3Whenthesteelistobewelded,itispresupposedthataweldingproceduresuitableforthegradeofsteelandintendeduseorservicewillbeutilized.SeeAppendixX3ofSpecifica-tionA6/A6Mforinformationonweldability.1.4Forstructuralproductstobeusedastensioncomponentsrequiringnotchtoughnesstesting,standardizedrequirementsareprovidedinthisstandard,andtheyarebaseduponAmericanAssociationofStateHighwayandTransportationOfficials(AASHTO)requirementsforbothfracturecriticalandnon-fracturecrit...
