Designation:F1459−06(Reapproved2017)StandardTestMethodforDeterminationoftheSusceptibilityofMetallicMaterialstoHydrogenGasEmbrittlement(HGE)1ThisstandardisissuedunderthefixeddesignationF1459;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthequantitativedeterminationofthesusceptibilityofmetallicmaterialstohydrogenembrittlement,whenexposedtohighpressuregaseoushydro-gen.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:E384TestMethodforMicroindentationHardnessofMate-rials3.SummaryofTestMethod3.1Athindiskmetallicspecimenissubjectedtoanincreas-inggaspressureatconstantrateuntilfailure(burstingorcrackingofthedisk).Theembrittlementofthematerialcanbeevaluatedbycomparingtherupturepressuresofidenticaldiskspecimensinhydrogen(PH2)andinareferenceinertgassuchashelium(PHe)(1,2).23.2TheratioPHe/PH2canbeusedtoevaluatethesuscepti-bilityofthemetallicmaterialtogaseoushydrogenembrittle-ment.Theratioisdependentonthepressurizationrate.Aratioof1orlessindicatesthematerialisnotsusceptibletohydrogenembrittlement.Aratiogreaterthan1indicatesthatthematerialissusceptibletohydrogenembrittlementandthesusceptibilityincreasesastheratioincre...
