ASTM A800/A800M-2010 奥氏体合金钢铸件中铁素体含量估算的标准实施规程
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【英文标准名称】:StandardPracticeforSteelCasting,AusteniticAlloy,EstimatingFerriteContentThereof
【原文标准名称】:奥氏体合金钢铸件中铁素体含量估算的标准实施规程
【标准号】:ASTMA800/A800M-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:A01.18
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:奥氏体;奥氏体不锈钢;铁素体;?舍费尔图;钢铸件;奥氏体不锈钢铸件;铁素含量;铁铬铸件;微观结构
【英文主题词】:austenite;austeniticstainlesssteel;ferrite;SchoeferDiagram;steelcastings;Austeniticstainlesssteelcastings;Ferritecontent;Iron-chromiumcastings;Microstructures
【摘要】:Thetensileandimpactproperties,theweldability,andthecorrosionresistanceofiron-chromium-nickelalloycastingsmaybeinfluencedbeneficiallyordetrimentallybytheratiooftheamountofferritetotheamountofausteniteinthemicrostructure.Theferritecontentmaybelimitedbypurchaseorderrequirementsorbythedesignconstructioncodesgoverningtheequipmentinwhichthecastingswillbeused.Thequantityofferriteinthestructureisfundamentallyafunctionofthechemicalcompositionofthealloyanditsthermalhistory.Becauseofsegregation,thechemicalcomposition,and,therefore,theferritecontent,maydifferfrompointtopointonacasting.Determinationoftheferritecontentbyanyoftheproceduresdescribedinthefollowingpracticeissubjecttovaryingdegreesofimprecisionwhichmustberecognizedinsettingrealisticlimitsontherangeofferritecontentspecified.Sourcesoferrorincludethefollowing:InDeterminationsfromChemicalComposition8212;Deviationsfromtheactualquantityofeachelementpresentinanalloybecauseofchemicalanalysisvariance,althoughpossiblyminorineachcase,canresultinsubstantialdifferenceintheratiooftotalferrite-promotingtototalaustenite-promotingelements.Therefore,theprecisionoftheferritecontentestimatedfromchemicalcompositiondependsontheaccuracyofthechemicalanalysisprocedure.InDeterminationsfromMagneticResponse8212;Phasesotherthanferriteandaustenitemaybeformedatcertaintemperaturesandpersistatroomtemperature.Thesemaysoalterthemagneticresponseofthealloythattheindicatedferritecontentisquitedifferentfromthatofthesamechemicalcompositionthathasundergonedifferentthermaltreatment.Also,becausethemagnetsorprobesofthevariousmeasuringinstrumentsaresmall,differentdegreesofsurfaceroughnessorsurfacecurvaturewillvarythemagneticlinkagewiththematerialbeingmeasured.InDeterminationsfromMetallographicExamination8212;Metallographicpointcountestimatesofferritepercentagemayvarywiththeetchingtechniqueusedforidentificationoftheferritephaseandwiththenumberofgridpointschosenfortheexamination,asexplainedinTestMethodE562.Theestimationofferritepercentbychemicalcompositionoffersthemostusefulandmostcommonmethodofferritecontrolduringmeltingofthemetal.Formostaccurateestimateofferritepercent,aquantitativemetallographicmethodshouldbeused.1.1Thispracticecoversproceduresanddefinitionsforestimatingferritecontentincertaingradesofausteniticiron-chromium-nickelalloycastingsthathavecompositionsbalancedtocreatetheformationofferriteasasecondphaseinamountscontrolledtobewithinspecifiedlimits.Methodsaredescribedforestimatingferritecontentbychemical,magnetic,andmetallographicmeans.1.2Thegradescoveredbythispracticeare:CF-3,CF-3A,CF-8,CF-8A,CF-3M,CF-3MA,CF-8M,CF-8C,CG-8M,andCH-10.1.3Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththepractice.1.3.1Withinthetext,theSIunitsareshowninbrackets.1.4Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuser......
【中国标准分类号】:H11
【国际标准分类号】:77_140_80
【页数】:6P.;A4
【正文语种】:
【原文标准名称】:奥氏体合金钢铸件中铁素体含量估算的标准实施规程
【标准号】:ASTMA800/A800M-2010
【标准状态】:现行
【国别】:
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:A01.18
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:奥氏体;奥氏体不锈钢;铁素体;?舍费尔图;钢铸件;奥氏体不锈钢铸件;铁素含量;铁铬铸件;微观结构
【英文主题词】:austenite;austeniticstainlesssteel;ferrite;SchoeferDiagram;steelcastings;Austeniticstainlesssteelcastings;Ferritecontent;Iron-chromiumcastings;Microstructures
【摘要】:Thetensileandimpactproperties,theweldability,andthecorrosionresistanceofiron-chromium-nickelalloycastingsmaybeinfluencedbeneficiallyordetrimentallybytheratiooftheamountofferritetotheamountofausteniteinthemicrostructure.Theferritecontentmaybelimitedbypurchaseorderrequirementsorbythedesignconstructioncodesgoverningtheequipmentinwhichthecastingswillbeused.Thequantityofferriteinthestructureisfundamentallyafunctionofthechemicalcompositionofthealloyanditsthermalhistory.Becauseofsegregation,thechemicalcomposition,and,therefore,theferritecontent,maydifferfrompointtopointonacasting.Determinationoftheferritecontentbyanyoftheproceduresdescribedinthefollowingpracticeissubjecttovaryingdegreesofimprecisionwhichmustberecognizedinsettingrealisticlimitsontherangeofferritecontentspecified.Sourcesoferrorincludethefollowing:InDeterminationsfromChemicalComposition8212;Deviationsfromtheactualquantityofeachelementpresentinanalloybecauseofchemicalanalysisvariance,althoughpossiblyminorineachcase,canresultinsubstantialdifferenceintheratiooftotalferrite-promotingtototalaustenite-promotingelements.Therefore,theprecisionoftheferritecontentestimatedfromchemicalcompositiondependsontheaccuracyofthechemicalanalysisprocedure.InDeterminationsfromMagneticResponse8212;Phasesotherthanferriteandaustenitemaybeformedatcertaintemperaturesandpersistatroomtemperature.Thesemaysoalterthemagneticresponseofthealloythattheindicatedferritecontentisquitedifferentfromthatofthesamechemicalcompositionthathasundergonedifferentthermaltreatment.Also,becausethemagnetsorprobesofthevariousmeasuringinstrumentsaresmall,differentdegreesofsurfaceroughnessorsurfacecurvaturewillvarythemagneticlinkagewiththematerialbeingmeasured.InDeterminationsfromMetallographicExamination8212;Metallographicpointcountestimatesofferritepercentagemayvarywiththeetchingtechniqueusedforidentificationoftheferritephaseandwiththenumberofgridpointschosenfortheexamination,asexplainedinTestMethodE562.Theestimationofferritepercentbychemicalcompositionoffersthemostusefulandmostcommonmethodofferritecontrolduringmeltingofthemetal.Formostaccurateestimateofferritepercent,aquantitativemetallographicmethodshouldbeused.1.1Thispracticecoversproceduresanddefinitionsforestimatingferritecontentincertaingradesofausteniticiron-chromium-nickelalloycastingsthathavecompositionsbalancedtocreatetheformationofferriteasasecondphaseinamountscontrolledtobewithinspecifiedlimits.Methodsaredescribedforestimatingferritecontentbychemical,magnetic,andmetallographicmeans.1.2Thegradescoveredbythispracticeare:CF-3,CF-3A,CF-8,CF-8A,CF-3M,CF-3MA,CF-8M,CF-8C,CG-8M,andCH-10.1.3Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththepractice.1.3.1Withinthetext,theSIunitsareshowninbrackets.1.4Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuser......
【中国标准分类号】:H11
【国际标准分类号】:77_140_80
【页数】:6P.;A4
【正文语种】:
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