Designation:A242/A242M−13AmericanAssociationStateHighwayandTransportationOfficialsStandardAASHTONo.:M161StandardSpecificationforHigh-StrengthLow-AlloyStructuralSteel1ThisstandardisissuedunderthefixeddesignationA242/A242M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*1.1Thisspecificationcovershigh-strengthlow-alloystruc-turalsteelshapes,plates,andbarsforwelded,riveted,orboltedconstructionintendedprimarilyforuseasstructuralmemberswheresavingsinweight[mass]oraddeddurabilityareimportant.Theatmosphericcorrosionresistanceofthesteelinmostenvironmentsissubstantiallybetterthanthatofcarbonstructuralsteelswithorwithoutcopperaddition.Whenprop-erlyexposedtotheatmosphere,thissteelcanbeusedbare(unpainted)formanyapplications(seeNote1).Thisspecifi-cationislimitedtomaterialupto4in.[100mm],inclusive,inthickness.NOTE1—Formethodsofestimatingtheatmosphericcorrosionresis-tanceoflow-alloysteels,seeGuideG101.1.2Whenthesteelistobewelded,itispresupposedthataweldingproceduresuitableforthegradeofsteelandintendeduseorservicewillbeutilized.SeeAppendixX3ofSpecifica-tionA6/A6Mforinformationonweldability.1.3Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedinde-pendentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecification.1.4Forstructuralproductsproducedfromcoilandfur-nishedwithoutheattreatmentorwithstressrelievingonly,theadditionalrequirements,includingadditionaltestingrequire-mentsandthereportingofadditionaltestresults,ofSpecifi-cationA6/A6Mapply.2.ReferencedDocuments2.1ASTMStandards:2A6/A6MSpecificationforGeneralRequirementsforRoll...
