基本信息
| 标准名称： | 二甲醚液化石油气的测定 气相色谱法 |
| 发布部门： | 福建省质量技术监督局 |
| 发布日期： | 2008-09-22 |
| 实施日期： | 2008-10-01 |
| 首发日期： | |
| 作废日期： | |
| 主管部门： | 福建省质量技术监督局 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2008-10-01 |
适用范围
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前言
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引用标准
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所属分类： 食品 食品加工与制品 禽 蛋加工与制品 食品技术 肉 肉制品和其他动物类食品 家禽和蛋
【英文标准名称】:StandardTestMethodforEvaluatingtheInfluenceofThermalInsulationsonExternalStressCorrosionCrackingTendencyofAusteniticStainlessSteel
【原文标准名称】:评定奥氏体钢热绝缘材料对外应力腐蚀开裂趋势的影响的标准试验方法
【标准号】:ASTMC692-2008e1
【标准状态】:现行
【国别】:
【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】:C16.31
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:奥氏体不锈钢;氯化物;德纳试验;滴水试验;外应力腐蚀裂痕(ESCC);鉴定试验;隔热;奥氏体不锈钢热绝缘;毛细作用
【英文主题词】:austeniticstainlesssteel;chloride;Danatest;Driptest;externalstresscorrosioncracking(ESCC);qualificationtest;thermalinsulation;Austeniticstainlesssteelthermalinsulation;Wicking
【摘要】:Aninherentcharacteristicofsomealloysofausteniticstainlesssteelistheirtendencytocrackatstresspointswhenexposedtocertaincorrosiveenvironments.ThemechanismsofESCCarecomplexandnotcompletelyunderstoodbutareapparentlyrelatedtocertainmetallurgicalproperties.Chlorideionsconcentratedatastresspointwillcatalyzecrackformation.IthasbeenreportedthatotherhalideionsdonotpromoteESCCtothesamedegreeasdoeschlorideusingthetesttechnologyofTestMethodC692(driptest).Chloridesarecommontomanyenvironments,sogreatcareshallbetakentoprotectausteniticstainlesssteelfromchloridecontamination.Mostthermalinsulationswillnot,ofthemselves,causestresscorrosioncrackingasshownbyqualificationtests.Whenexposedtoelevated-temperature(boilingpointrange),environmentscontainingchlorides,moisture,andoxygen,however,someinsulationsystemsactascollectingmedia,transmigratingandconcentratingchloridesonheatedstainlesssteelsurfaces.Ifmoistureisnotpresent,thechloridesaltscannotmigrate,andstresscorrosioncrackingbecauseofchloride-contaminatedinsulationcannottakeplace.Insulationmaterialsareavailablethatarespeciallyformulatedtoinhibitstresscorrosioncrackinginthepresenceofchloridesthroughmodificationsinbasiccompositionorincorporationofcertainchemicaladditives.Theabilityofthe28-daytesttomeasurethecorrosionpotentialofinsulationmaterialsisdocumentedbyKarnes,whosedataappeartohavebeenusedforconstructionoftheacceptabilitycurveusedinSpecificationC795andotherspecifications.Themetalforallofthecouponsusedinthistestmethod(C692)shallbequalified(seeSection14)toascertainthatunderconditionsofthetest,chlorideionswillcausethemetaltocrack,anddeionizedwateralonewillnotcausecracks.1.1Thistestmethodcoverstwoproceduresforthelaboratoryevaluationofthermalinsulationmaterialstodeterminewhethertheycontributetoexternalstresscorrosioncracking(ESCC)ofausteniticstainlesssteelduetosolublechlorideswithintheinsulation.ThislaboratoryprocedureisnotintendedtocoverallofthepossiblefieldconditionsthatcontributetoESCC.1.2Whilethe1977editionofthistestmethod(Danatest)isapplicableonlytowicking-typeinsulations,theproceduresinthiseditionareintendedtobeapplicabletoallinsulatingmaterials,includingcements,someofwhichdisintegratewhentestedinaccordancewiththe1977edition.Wickinginsulationsarematerialsthatwetthroughandthroughwhenpartially(50to75%)immersedinwaterforashortperiodoftime(10minorless).1.3Theseproceduresareintendedprimarilyasapreproductiontestforqualificationofthebasicchemicalcompositionofaparticularmanufacturer''sproductandarenotintendedtoberoutinetestsforongoingqualityassuranceorproductionlotcompliance.TestMethodsC871,ontheotherhand,isusedforconfirmationofacceptablechemicalpropertiesofsubsequentlotsofinsulationpreviouslyfoundacceptablebythistestmethod.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitat......
【中国标准分类号】:
【国际标准分类号】:77_060
【页数】:7P.;A4
【正文语种】: