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【英文标准名称】:StandardPracticeforDetectionofLargeInclusionsinBearingQualitySteelbytheUltrasonicMethod
【原文标准名称】:用超声波法检测优质轴承钢中大块夹杂物的标准实施规范
【标准号】:ASTME588-2003
【标准状态】:现行
【国别】:
【发布日期】:2003
【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】:A01.28
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:夹杂物;无损检验;工艺;金属;超声检验;试验;钢
【英文主题词】:bearingsteel;cleanliness;nondestructiveexamination;steel;ultrasonictesting
【摘要】:ComparisonwithOtherInclusionRatingMethods8212;Becausethetestisperformedonavolumetricratherthanasurface-examinationbasis,theultrasonicmethodisinherentlybetterabletodetectinfrequentlyoccurringlargeinclusionsorclustersofsmallinclusionsthaneddycurrent,magneticparticle,microscopical,ormacroscopicexaminationprocedures.LimitationofInclusionSizeandType8212;Alimitationofthemethodisthatitwillnotdetectallinclusions.Inclusionchemistry,size,shape,location,anddistributionmaylimittheabilityofthemethodtoprovideindicationsdistinctfromthosegeneratedbythesurroundingmetallurgicalstructure.Therecommendedpracticeisonlymeaningfullyapplicabletoexaminationofsteelwhereintheinclusionsizeandtypearewithinthedetectioncapabilitiesofthemethod.Forsteelwhereininclusionsize,dispersion,andchemistrypreventoptimuminclusiondetectionbyultrasonics,microscopicalmethodsdetailedinPracticeE45maybeapplied.1.1Thispracticecoversaprocedurefortheratingofrectangularsteelsectionsbyimmersionultrasonictechniques.Itspurposeistoprovideinformationonthecontentoflargeinclusionsorclustersofsmallinclusionsfordeterminingthesuitabilityofasteellotforbearingapplications.Thispracticeinnomannerdefinesorestablisheslimitsofacceptability.1.2Forthisdocument,largeinclusionsaredefinedinultrasonictermsasthosehavingareflectingareaequivalenttoorlargerthana1/64-in.diameterflat-bottomholeinasteelreferenceblockofsimilarpropertiesandthickness.Inmetallographicterms,largeinclusions,definedinthisway,areofapproximatelythesamesizeasthesmallestdetectablesizesrevealedbythemacroscopicmethodsofPracticeE45.Insomecases,inclusionssmallerthanthosedescribedpreviouslycanbedetectedeitherindividuallyorinclusters,dependingontheirtype,chemicalcomposition,orientationtotheultrasonicbeamanddistancefromthesoundentrysurfaceofthespecimen.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H26
【国际标准分类号】:
【页数】:9P.;A4
【正文语种】: