Designation:A1090/A1090M−14StandardSpecificationforForgedRingsandHollowsProducedfromSteelswithAtmosphericCorrosionResistance1ThisstandardisissuedunderthefixeddesignationA1090/A1090M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcovershigh-strength,low-alloysteelringandhollowforgingsintendedprimarilyforuseasbaseplatesinweldedtubularstructures.Howeveruseofthisspecificationisnotrestrictedtosuchapplicationsanditmaybeusedinotherapplicationsforwhichtheattributesofthematerials,asdefinedbythisspecification,areappropriate.1.2Theatmosphericcorrosionresistanceofthesesteelsinmostenvironmentsissubstantiallybetterthanthatofcarbonstructuralsteelwithorwithoutcopperaddition(seeNote1).Whenexposedtotheatmosphere,thissteelissuitableformanyapplicationsinthebare(unpainted)condition.NOTE1—SeeGuideG101formethodsofestimatingtheatmosphericcorrosionresistanceoflow-alloysteels.1.3Thethicknessofforgingsislimitedonlybythecapacityofthecompositiontomeetthespecifiedmechanicalpropertyrequirements;however,currentpracticenormallylimitsthethicknessofforgingsfurnishedunderthisspecificationtoarangeof2to6in.[51to152mm].NOTE2—Whenthesteelistobewelded,aweldingproceduresuitableforthegradeofsteelandintendeduseorserviceshouldbeused.SeeAppendixX3ofSpecificationA6/A6Mforinformationonweldability.1.4Thetextofthisspecificationcontainsnotes,footnotes,orboththatprovideexplanatorymaterial.Suchnotesandfootnotes,excludingthoseintablesandfigures,donotcontainanymandatoryrequirements.1.5Supplementaryrequirementsareavailablebutshallapplyonlywhenspecifiedbythepurchaseratthetimeofordering.1.6ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combinin...
