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1、ASTMA2622015奥氏体不锈钢晶间腐蚀敏感性检测标准方法Designation:A262?15StandardPracticesforDetectingSusceptibilitytoIntergranularAttackinAusteniticStainlessSteels1Thisstandardisissuedunderthe?xeddesignationA262;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptio
2、nor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(′)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1The
3、sepracticescoverthefollowing?vetests:1.1.1PracticeA—OxalicAcidEtchTestforClassi?cationofEtchStructuresofAusteniticStainlessSteels(Sections4to13,inclusive),———————————————————————————————————————————————1.1.2PracticeB—FerricSulfate-SulfuricAcidTestforDe-tectingSuscep
4、tibilitytoIntergranularAttackinAusteniticStainlessSteels(Sections14to25,inclusive),1.1.3PracticeC—NitricAcidTestforDetectingSuscepti-bilitytoIntergranularAttackinAusteniticStainlessSteels(Sections26to36,inclusive),1.1.4PracticeE—Copper–CopperSulfate–SulfuricAcidTest
5、forDetectingSusceptibilitytoIntergranularAttackinAusteniticStainlessSteels(Sections37to46,inclusive),and1.1.5PracticeF—Copper–CopperSulfate–50%SulfuricAcidTestforDetectingSusceptibilitytoIntergranularAttackinMolybdenum-BearingAusteniticStainlessSteels(Sections47to58
6、,inclusive).1.2TheOxalicAcidEtchTestisarapidmethodofidentifying,bysimpleetching,thosespecimensofcertainstainlesssteelgradesthatareessentiallyfreeofsusceptibilitytointergranularattackassociatedwithchromiumcarbideprecipitates.Thesespecimenswillhavelowcorrosionratesinc
7、ertaincorrosiontestsandthereforecanbeeliminated(screened)fromtestingas“acceptable.”Theetchtestisapplicableonlytothosegradeslistedintheindividualhotacidtestsandclassi?esthespecimenseitheras“acceptable”oras“suspect.”1.3Theferricsulfate-sulfuricacidtest,thecopper–coppe
8、rsulfate–50%sulfuricacidtest,andthenitricacidtestarebasedonweightlossdeterminationsand,thus,provideaquantitativemeasureoftherelativeperfor
