Designation:A131/A131M−14StandardSpecificationforStructuralSteelforShips1ThisstandardisissuedunderthefixeddesignationA131/A131M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoversstructuralsteelplates,shapes,bars,andrivetsintendedprimarilyforuseinshipconstruction.1.2Materialunderthisspecificationisavailableinthefollowingcategories:1.2.1OrdinaryStrength—GradesA,B,D,andEwithaspecifiedminimumyieldpointof34ksi[235MPa],and1.2.2HigherStrength—GradesAH,DH,EH,andFHwithaspecifiedminimumyieldpointof46ksi[315MPa],51ksi[350MPa],or57ksi[390MPa].1.3ShapesandbarsarenormallyavailableasGradesA,AH32,andAH36.Othergradesmaybefurnishedbyagree-mentbetweenthepurchaserandthemanufacturer.1.4Themaximumthicknessofproductsfurnishedunderthisspecificationis4in.[100mm]forplatesand2in.[50mm]forshapesandbars.1.5Whenthesteelistobewelded,itispresupposedthataweldingproceduresuitableforthegradeofsteelandintendeduseorservicewillbeutilized.SeeAppendixX3ofSpecifica-tionA6/A6Mforinformationonweldability.1.6Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasthestandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththisspecifi-cation.2.ReferencedDocuments2.1ASTMStandards:2A6/A6MSpecificationforGeneralRequirementsforRolledStructuralSteelBars,Plates,Shapes,andSheetPilingA370TestMethodsandDefinitionsforMechanicalTestingofSteelProductsE112TestMethodsforDeterminingAverageGrainSize3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1controlrolling(controlledrolling),n—ahotdeforma-tionprocessintendedtoprovideaus...
