Designation:A588/A588M−15AmericanAssociationStateHighwayandTransportationOfficialsStandardAASHTONo.:M222StandardSpecificationforHigh-StrengthLow-AlloyStructuralSteel,upto50ksi[345MPa]MinimumYieldPoint,withAtmosphericCorrosionResistance1ThisstandardisissuedunderthefixeddesignationA588/A588M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcovershigh-strengthlow-alloystruc-turalsteelshapes,plates,andbarsforwelded,riveted,orboltedconstructionbutintendedprimarilyforuseinweldedbridgesandbuildingswheresavingsinweightoraddeddurabilityareimportant.Theatmosphericcorrosionresistanceofthissteelinmostenvironmentsissubstantiallybetterthanthatofcarbonstructuralsteelswithorwithoutcopperaddition(seeNote1).Whenproperlyexposedtotheatmosphere,thissteelissuitableformanyapplicationsinthebare(unpainted)condition.Thisspecificationislimitedtomaterialupto8in.[200mm]inclusiveinthickness.NOTE1—Formethodsofestimatingtheatmosphericcorrosionresis-tanceoflow-alloysteels,seeGuideG101.1.2Whenthesteelistobewelded,aweldingproceduresuitableforthegradeofsteelandintendeduseorserviceistobeutilized.SeeAppendixX3ofSpecificationA6/A6Mforinformationonweldability.1.3Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemistobeusedindependentlyoftheother,withoutcombiningvaluesinanyway.1.4Thetextofthisspecificationcontainsnotes,footnotes,orboth,thatprovideexplanatorymaterial.Suchnotesandfootnotes,excludingthoseintablesandfigures,donotcontainanymandatoryrequirements.1.5Forstructuralproductsproducedfromcoilandfur-nishedwithoutheattreatmentorwithstressrelievingonly,the...
