【英文标准名称】:StandardPracticeforExtremeValueAnalysisofNonmetallicInclusionsinSteelandOtherMicrostructuralFeatures
【原文标准名称】:在钢铁和其它微结构特点中非金属内含物的极值分析的标准实施规程
【标准号】:ASTME2283-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:E04.09
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:extremevaluestatistics;inclusionlength;maximuminclusionlength;maximumlikelihoodmethod;Extremevaluestatistics;Inclusionlength;Inclusions;Indigenousinclusions;Maximuminclusionlength;Metallographicanalysis/inspection;Microstructure
【摘要】:Thispracticeisusedtoassesstheindigenousinclusionsorsecond-phaseconstituentsinmetalsusingextremevaluestatistics.Itiswellknownthatfailuresofmechanicalcomponents,suchasgearsandbearings,areoftencausedbythepresenceoflargenonmetallicoxideinclusions.Failureofacomponentcanoftenbetracedtothepresenceofalargeinclusion.PredictionsrelatedtocomponentfatiguelifearenotpossiblewiththeevaluationsprovidedbystandardssuchasTestMethodsE45,PracticeE1122,orPracticeE1245.Theuseofextremevaluestatisticshasbeenrelatedtocomponentlifeandinclusionsizedistributionsbyseveraldifferentinvestigators(3-8).Thepurposeofthispracticeistocreateastandardizedmethodofperformingthisanalysis.Thispracticeisnotsuitableforassessingtheexogenousinclusionsinsteelsandothermetalsbecauseoftheunpredictablenatureofthedistributionofexogenousinclusions.Othermethodsinvolvingcompleteinspectionsuchasultrasonicsmustbeusedtolocatetheirpresence.1.1Thispracticedescribesamethodologytostatisticallycharacterizethedistributionofthelargestindigenousnonmetallicinclusionsinsteelspecimensbaseduponquantitativemetallographicmeasurements.Thepracticeisnotsuitableforassessingexogenousinclusions.1.2Baseduponthestatisticalanalysis,thenonmetalliccontentofdifferentlotsofsteelscanbecompared.1.3Thispracticedealsonlywiththerecommendedtestmethodsandnothinginitshouldbeconstruedasdefiningorestablishinglimitsofacceptability.1.4ThemeasuredvaluesarestatedinSIunits.Formeasurementsobtainedfromlightmicroscopy,linearfeatureparametersshallbereportedasmicrometers,andfeatureareasshallbereportedasmicrometers.1.5Themethodologycanbeextendedtoothermaterialsandtoothermicrostructuralfeatures.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H11
【国际标准分类号】:77_040_99
【页数】:11P.;A4
【正文语种】:英语


【英文标准名称】:Heatingboilers-Part7:Gas-firedcentralheatingboilersequippedwithaforceddraughtburnerofnominalheatoutputnotexceeding1000kW;EnglishversionofDINEN303-7:2006-05
【原文标准名称】:加热锅炉.第7部分:用标称热输出功率小于1000kW的强排风燃炉装备的燃气中央加热锅炉
【标准号】:DINEN303-7-2007
【标准状态】:现行
【国别】:德国
【发布日期】:2007-05
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:鼓风燃烧器;组装;锅炉结构;锅炉;中央加热;中央加热设备;结构要求;定义;设计;设备安全;功能效率;燃气连接;燃气技术;气体燃料;气体;加热设备;加热技术;检验;作标记;材料;安全;安全工程;安全要求;规范(验收);结构体系;容器;测试;热环境系统;定型测试
【英文主题词】:
【摘要】:ThisEuropeanStandardspecifiestherequirementsandtestmethodsforthecontruction,thesafetyandtherationalenergyusageforgas-firedstandardandlowtemperaturecentralheatingboilersequippedwithaforceddraughtburner.Theseboilerscompriseaboilerbodyandaforceddraughtgasburnerbroughttogetherattheproducer'sassemblyfacility,thewholebeingdisignedandmarketedasacompleteboiler.Thisstandarddoesnotapplytothecaseoftheassemblyofaboilerbodyandaforceddraughtgasburnerdesignedandmarketedseparately.Inthiscase,EN303-3applies.ThisEuropeanStandardappliestotypeBboilerswithanominalheatoutputnotexceeding100kwwithawatertemperatureatnormaloperationnotexceeding105°Candwithamaximumwater-sideoperatingpressurenotexceeding8bar.ThisEuropeanStandarddoesnotcontainallthenecessaryrequirementsfor:-condensingboilersandcombinationboilers;-boilersintendedtobeinstalledintheopen;-boilerspermanentlyfittedwithmorethanoneflueoutlet;-boilersintendedtobeconnectedtoacommonfluehavingmechanicalextraction;-boilersequippedwithseveralcombustionchambers.ThisEuropeanStandarddoesnotapplytoliving-spacededicatedboilers(see3.6).ThisEuropeanStandardonlycoverstypetesting.
【中国标准分类号】:J98
【国际标准分类号】:91_140_10
【页数】:63P.;A4
【正文语种】:英语