Designation:G157−98(Reapproved2013)StandardGuideforEvaluatingCorrosionPropertiesofWroughtIron-andNickel-BasedCorrosionResistantAlloysforChemicalProcessIndustries1ThisstandardisissuedunderthefixeddesignationG157;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversanevaluationapproachthatisde-signedtoprovideinformationonthecorrosionpropertiesofwroughtiron-andnickel-basedalloysforthechemicalprocessindustries.Thisguideincorporatestestconditionsforgeneralcorrosionmeasurementsinavarietyofenvironments,crevicecorrosionresistanceinchlorideenvironments,andstresscor-rosioncrackingresistanceinchlorideenvironments.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterG1PracticeforPreparing,Cleaning,andEvaluatingCorro-sionTestSpecimensG15TerminologyRelatingtoCorrosionandCorrosionTest-ing(Withdrawn2010)3G30PracticeforMakingandUsingU-BendStress-CorrosionTestSpecimensG36PracticeforEvaluatingStress-Corrosion-CrackingRe-sistanceofMetalsandAlloysinaBoilingMagnesiumChlorideSolutionG46GuideforExaminationandEvaluationofPittingCor-rosionG48TestMethodsforPittingandCreviceCorrosionResis-tanceofStainlessSteelsandRelatedAlloysbyUseofFerricChlorideSolutionG123TestMethodforEvaluatingStress-CorrosionCrackingofStainlessAlloyswithDifferentNickelContentinBoilingAcidifiedSodiumChlorideSolution3.Terminology3.1Termssuchascrevicecorrosion,stresscorrosioncracking,andcorrosionratearedefinedinTerminologyG15.4.Significanc...
