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【英文标准名称】:SpecificationforAlloy-SteelBoltingMaterialsforLow-TemperatureService
【原文标准名称】:低温设备用合金钢螺栓材料规范
【标准号】:ANSI/ASTMA320/A320M-2001
【标准状态】:现行
【国别】:美国
【发布日期】:2001
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:钢;螺栓连接(法兰);紧固件
【英文主题词】:steels;fasteners;bolting
【摘要】:Thisspecificationcoversalloysteelboltingmaterialsforpressurevessels,valves,flanges,andfittingsforlow-temperatureservice.Theterm"boltingmaterial"asusedinthisspecificationcoversrolled,forged,orstrainhardenedbars,bolts,screws,studs,andstudbolts.Thebarsshallbehot-wrought.Thematerialmaybefurtherprocessedbycenterlessgrindingorbycolddrawing.Austeniticstainlesssteelmaybesolutionannealedorannealedandstrain-hardened.Whenstrainhardenedausteniticstainlesssteelisordered,thepurchasershouldtakespecialcaretoensurethatAppendixX1isthoroughlyunderstood.Severalgradesarecovered,includingbothferriticandausteniticsteelsdesignatedL7,B8,etc.Selectionwilldependondesign,serviceconditions,mechanicalproperties,andlow-temperaturecharacteristics.Themechanicalrequirementsofindicatethediametersforwhichtheminimummechanicalpropertiesapplytothevariousgradesandclasses,andTable2stipulatestherequirementsforCharpyimpactenergyabsorption.Themanufacturershoulddeterminethatthematerialcanconformtotheserequirementsbeforepartsaremanufactured.Forexample,whenGradeL43isspecifiedtomeettheTable2impactenergyvaluesat-150?F[-101?C],additionalrestrictions(suchasprocuringasteelwithlowerPandScontentsthanmightnormallybesupplied)inthechemicalcompositionforAISI4340arelikelytoberequired.Note1--Thecommitteeformulatingthisspecificationhasincludedseveralgradesofmaterialthathavebeenratherextensivelyusedforthepresentpurpose.Othercompositionswillbeconsideredforinclusionbythecommitteefromtimetotimeastheneedbecomesapparent.Usersshouldnotethathardenabilityofsomeofthegradesmentionedmayrestrictthemaximumsizeatwhichtherequiredmechanicalpropertiesareobtainable.NutsforusewiththisboltingmaterialarecoveredinSectionandthenutmaterialshallbeimpacttested.SupplementaryRequirements(S1,S2,andS3)ofanoptionalnatureareprovided.Theyshallapplyonlywhenspecifiedintheinquiry,contractandorder.Thisspecificationisexpressedinbothinch-poundunitsandinSIunits.However,unlesstheorderspecifiestheapplicable"M"specificationdesignation(SIunits),thematerialshallbefurnishedtoinch-poundunits.Thevaluesstatedineitherinch-poundunitsorSIunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemarenotexactequivalents;therefore,eachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecification.
【中国标准分类号】:H49
【国际标准分类号】:77_080_20;21_060_01
【页数】:
【正文语种】:英语