ISO 04491-2-2023.docx

INTERNATIONA1.STANDARDISO4491-2editionThid2023-04Meta1.1.icpowdersDeterminationofoxygencontentbyreductionmethods一忸即Nfmassonhydrogenreduction(hydrogen1.oss)Poudresmeta1.1.iques-Dosagedeoxyginepar1.esmethodesdereductionPartie2:Pertedemasseparreductiondanshydrogene(pertedanshydrogine)ReferencenumberIS0449b2:2023(E)Contentsforeword2ScopeoNormativereferencesTermsanddefinitionsReagentsandmateria1.sApparatusGenera1.Ba1.anceCuEnghfubeThermocoup1.eBoatSanip1.ingProcedure7.1 Genera1.7.2 TestprocedureCa1.cu1.ationandexpressionoftestresu1.ts10M<PrecisionTestreportAnnexA(informative)Interpretationofresu1.ts一7Bib1.iography.一.88Ca1.cu1.ationandexpressionoftestresu1.tsThehydrogen1.oss/hi,expressedasamassfractioninpercent,isgivenbyFormu1.a(1):m2rnwhere/Htisthehydrogen1.ossexpressedasamassfractioninpercent;miisthemass,ingrams,oftheemptypre-treatedboat(5.6)；m2isthemass,ingrams,oftheboatwiththetestportionbeforethetest;m3isthemass,ingrams,oftheboatwiththereducedtestportionaftertest.Themeanofthetwodeterminationsisca1.c1.ate4W4s-ca1.1.ationandtheexpressionofthetestresu1.tsarecarriedoutaccordingtotheru1.esshowninTab1.e2.Tab1.e2Ca1.cu1.ationofmeanva1.ueTestedpowder%(massfraction)1.eve1.%Repeatabi1.ity(SrReproducibi1.ity(Sr>051,00,01max.S%fmean>1,0),01max.5%ofmean0.19P麴哪胪s*Ca1.cu1.ationoftestresu1.tstothenearestMaximumpermissib1.edifferencebetweentwodetemina*tionsExpressionofresu1.tstothenearestITietafpWUc!r,JiceiaDtC3CTtrfT11vttttWtrfmrfHCTratn>三tt>jr5ttttiJrTOrtwHwm7-wpWCrStftCHt3T>petcct-Ht-tfw-tftwiMatMHsawfy-sftPnuzdArtvvAPureatomizedironpowderSpongeironpowderWateratomizedcopperpowderTungstenpowderInTah1.e4,therTpMefcrtttjnndReatai1.iit)1)M)4eprniMm9(sstandarddeviati<>s,iation.Testedpowder1.eVe1.AverageH?1.ossRepeatabIIityfSr)StandarddeviationReproducibi1.1.ty(SRStandarddeviationWateratomizedcopperpowder0,180,0200,037TUn承州H）物附6ssCa1.cu1.ationoftest11(MftstothenearestMaximum脚面SSibICdifferencebetweentwodetemina<tionsEHssionofresu1.tstothenearest5C)ISO2023-A1.1.rightsreseapparatusWithinbetweenshortesttestfeasib1.efoundintenra1.identica1.exceedma1.eria1.repea1.abi1.ityoperatorUSingTab1.e5,reproducibi1.ityidentica1.testmateria1.onreportednotmore1.aboratorieswi1.1.differbymorenorma1.andTab1.e5Repeatabi1.ityandReproducibi1.ity,differencebetveentwotestsat95%probabi1.ity1.eve1.AverageH-1.oss1.imit1.imitWateratomizedcopperpowder0r180.0570.103Theprecisionyear2020determinedfmmanexperimentorganizedinvestigationaccordancewithTheparticipatingparticipatingusedshdywereequipmentthe(funace,proceduredescribedforISO4491-2.IOTestreporta)areferencetothisdoment,i.e.ISO4491-2:2023;c)thetestresu1.tsobtained；e) detai1.sofanyoccurrencewhichmayhaveaffectedtheresu1.tsThedifferencethetworesu1.tstimeonwi1.1.testtheone1.imit(r),seethesameonaveragenotmorethanoncein20casesinthenorma1.andcorrectoperationofthemethod.Testresu1.tson1.imit(J),Tab1.e5,averagebytwothanoncein20casesinthethanthecorrectoperationofthemethodtheandana1.ysedinwasana1.ysedtwoISO5725-2datawerewhereeachthepowdersinc1.udedtimesby71.aboratories.testsca1.eandboats)inthestudy.111.aboratories1.aboratoriesintheirowntestfo1.1.owingThetestreportsha1.1.inc1.udethefo1.1.owinginformation:b)a1.1.detai1.snecessaryfortheidentificationofthetestsamp1.e;d)detai1.sofanyoperationsnotspecifiedinthisdocument,orregardedasoptiona1.;f) thedateofthetest.AnnexAInterpretationofresu1.tsA.1.contribute,positive1.ycomp1.exnegative1.y1.1.oyedmeasuredit1.ossnowthoughtthatfo1.1.owingchemica1.changescanA.2A.3.4A.5compounds.Examp1.esarecarbon,nitrogen,phosphorusandsu1.fur.A.6A.7reducedbycarbonunderthespecifiedtestconditions,8duringthetest).A.9ISO2023-A1.1.nghtsreserved(informative)7characteristicthatmassofPowderusefu1.hydiogenprocessingcommon1.ymeta1.1.urgica1.materiakpowderorigina1.1.yconsideredtobeanestimateoftheoxygencontentofhydrogen-reducib1.eoxidesbut,withtheadventofmoreorandtoChepowders1.isinmass.Thus,Cheotherfactorsshou1.dbeconsideredwheninterpretingexperimenta1.resu1.ts.1.z3,MgOzmeasured1.ossTiOmasswhicharenotnotreducib!eoxygenpresenttestnditions.oxidessuchasSiO2.The1.ossofmassinc1.udesanywatervapourand/orhydrocarbonspresentinthepowder.The1.ossofmassinc1.udesgaseswhich,owingtoeitheradsorptionorocc1.usion,canbepresentinthepowderandwhichare1.iberatedduringheating.Theamountofsuchgasesisnorma1.1.yneg1.igib1.e.whichUnder1.osstheofspecifiedindudesconditionspartia1.1.ycomp1.ete1.yremoved,eitherbecausepowderandvo1.ati1.eorbecausetheyreactwiththehydrogenorWithoxidespresentinthepowdertoformvo1.ati1.eThe1.ossofmassinc1.udesmeta1.swhicharepresentinthepowder