GB/T××××—200×

GB/T13560—200×

PAGE

PAGE

1

IssuedbyGeneralAdministrationofQualitySupervision,Inspectionand

QuarantineofthePeople'sRepublicofChina

StandardizationAdministrationofthePeople'sRepublicofChina

Implementationdate:xxxx-xx-xx

Issuedate:xxxx-xx-xx

Strip-castingneodymiumironboronalloyflakes

速凝釹鐵硼合金薄片

(EnglishTranslation）

GB/T29655-2025

ReplaceGB/T29655-2013

NationalStandardofthePeople'sRepublicofChina

ICS77.120.99

H65

9

GB/T29655—2025

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GB/T13560—200X

Foreword

SAC/TC229isinchargeofthisEnglishtranslation.IncaseofanydoubtaboutthecontentsofEnglishtranslation,theChineseoriginalshallbeconsideredauthoritative.

ThisdocumentisdraftedinaccordancewiththerulesgivenintheGB/T1.1—2020Directivesforstandardization-Part1:Rulesforthestructureanddraftingofstandardizingdocuments.

ThisdocumentreplacestheGB/T29655-2013(Neodymiumironboronstrip-casting)inwhole.Inadditiontoanumberofeditorialchanges,thefollowingtechnicaldeviationshavebeenmadewithrespecttotheGB/T29655-2013(Neodymiumironboronstrip-casting).

a)Modifiedtermsanddefinitions(seeChapter3,Chapter3ofthe2013edition);

b)Deletedproductclassification(see4.1ofthe2013edition);

c)Modifiedtherequirementsformaincomponents,changing"controlaccuracyofmainchemicalcomponents"to"allowabledeviationofmaincomponents"(see4.1,4.3ofthe2013edition);

d)Modifiedtherequirementsforimpuritycontent(see4.2,4.4ofthe2013edition);

e)Modifiedtherequirementsforthickness(see4.3,4.5ofthe2013edition);

f)Modifiedtherequirementsformicrostructure(see4.4,4.6ofthe2013edition);

g)Modifiedthecontentof"packaging,sign,transport,storageandaccompanyingdocuments"(seeChapter7,Chapter7ofthe2013edition);

h)Modifiedchemicalcomponents(seeAnnexA,4.2ofthe2013edition);

i)Modifiedthemicrostructuretestingmethod(seeAnnexB,5.3.4ofthe2013edition).

Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.Theissuingbodyofthisdocumentshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.

ThisdocumentwasproposedandpreparedbySAC/TC229NationalTechnicalCommitteeonRareEarthofStandardizationAdministrationofChina.

Thisdocumentwasissuedin2013asfirstedition,andwasfirstrevisedin2025.

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Strip-castingneodymiumironboronalloyflakes

1Scope

Thisdocumentspecifiesthetechnicalrequirements,testmethods,inspectionrules,packaging,sign,transport,storageandaccompanyingdocumentsforstrip-castingneodymiumironboronalloyflakes.

Thisdocumentisapplicabletotheinspectionandproductionofstrip-castingneodymiumironboronalloyflakesforsinteredneodymiumironboronpermanentmagnetmaterials.

2Normativereferences

Thefollowingnormativedocumentscontainprovisionswhich,throughnormativereferenceinthistext,constituteindispensableprovisionsofthisdocument.Fordatedreferences,onlytheversioncorrespondingtothatdateappliestothisdocument.Forundatedreferences,thelatestedition(includingallamendments)ofthenormativedocumentreferredtoapplies.

GB/T8170Rulesofroundingofffornumericalvalues&expressionandjudgmentoflimitingvalues

GB/T15676Termsforrareearths

GB39176Rareearthproductspacking,marking,transportandstorage

XB/T617.1Chemicalanalysismethodsforneodymiumironboronalloy-Part1:Determinationoftotalrareearthcontent-Oxalategravimetry

XB/T617.2Chemicalanalysismethodsforneodymiumironboronalloy-Part2:DeterminationoffifteenREOrelativecontents

XB/T617.3Chemicalanalysismethodsforneodymiumironboronalloy-Part3:Determinationofboron,aluminum,copper,cobalt,magnesium,silicon,calcium,vanadium,chromium,manganese,nickel,zincandgalliumcontents-Inductivelycoupledplasmaatomicemissionspectrometry

XB/T617.6Chemicalanalysismethodsforneodymiumironboronalloy-Part6:Determinationofcarboncontent-Highfrequency-infraredabsorptionmethod

XB/T617.7Chemicalanalysismethodsforneodymiumironboronalloy-Part7:Determinationofoxygenandnitrogencontents-Impulse-infraredandimpulse-thermalconductanceabsorptionmethod

3Termsanddefinitions

Forthepurposesofthisdocument,thetermsanddefinitionsgiveninGB/T15676andthefollowingapply.

3.1

strip-castingneodymiumironboronalloyflakes

aflakyproductproducedbypouringmoltenneodymiumironboronalloyontoarotatingmetalcoolingrollertomakethemeltalloysolidifyrapidly

3.2

therollersurfacesideofstrip-castingneodymiumironboronalloyflakes

thesurfaceofthestrip-castingneodymiumironboronalloyflakesthatisincontactwiththesurfaceofthemetalcoolingrollerduringproduction

3.3

thefreesurfacesideofstrip-castingneodymiumironboronalloyflakes

thesurfaceofthestrip-castingneodymiumironboronalloyflakesthatisoppositetotherollersurfacesideandincontactwiththeambientatmosphereduringproduction

3.4

thicknessdistributionpercentage

inacertainnumbersamplesofthicknessmeasurement,theproportionofthenumberofsampleswithinaspecifiedthicknessrangetothetotalnumberofmeasuredsamples

3.5

columnarcrystal

alongcolumnarorplate-likegrainstructureformedduringstripcastingandpreferentiallygrowingalongaspecificdirection

4Technicalrequirements

4.1MainComponents

ThemaincomponentsoftheproductaregiveninAnnexA.TheallowabledeviationofmaincomponentsshallcomplywiththerequirementsinTable1.Ifthebuyerhasspecialrequirements,itcanbedeterminedthroughnegotiationbetweenthesupplierandbuyer.

Table1Allowabledeviationofmaincomponents

ProductGrade

GradeAAA

GradeAA

GradeA

Allowabledeviationofmaincomponents(massfraction)

%

REa

±0.20

±0.30

±0.40

Nd

±0.10

±0.20

±0.30

Pr

±0.10

±0.20

±0.30

Ce

±0.10

±0.20

±0.30

Tb

±0.10

±0.20

±0.30

Dy

±0.10

±0.20

±0.30

Gd

±0.10

±0.20

±0.30

Ho

±0.10

±0.20

±0.30

B

±0.02

±0.03

±0.04

aREisthetotalamountofeachrareearthelementintheformuladesign.

4.2Impuritycomponents

TheimpuritycomponentsoftheproductshallcomplywiththerequirementsinTable2.Ifthebuyerhasspecialrequirements,itcanbedeterminedthroughnegotiationbetweenthesupplierandbuyer.

Table2Impuritycomponents

ProductGrade

GradeAAA

GradeAA

GradeA

Impuritycontent,maximum(massfraction)

%

Totalrareearthimpurities

0.100

0.150

0.200

Non-rareearthimpurities

C

0.020

0.025

0.030

N

0.003

0.004

0.005

O

0.020

0.030

0.030

Ca

0.020

0.020

0.020

Si

0.030

0.030

0.030

Mn

0.030

0.030

0.030

Note:Impuritiesrefertoelementsintroducedfromrawmaterialsorduringpreparation,whicharenotintentionallyadded.

4.3Thickness

Thesingleflakethicknessrangeoftheproductis0.10mm~0.50mm,andthethicknessdistributionpercentageshallcomplywiththerequirementsinTable3.Ifthebuyerhasspecialrequirements,itcanbedeterminedthroughnegotiationbetweenthesupplierandbuyer.

Table3Thicknessdistributionpercentage

ProductGrade

GradeAAA

GradeAA

GradeA

（t±0.05）mm

≥85%

≥80%

≥70%

Note:tistheaveragethicknessoftheproduct.

4.4Microstructure

Observedfromthecross-sectionperpendiculartotherollersurfacesideofthestrip-castingneodymiumironboronalloyflakeandperpendiculartotherollermarkdirection,theaveragewidthcolumnarcrystalshallbe1μm~5μm.ThemicrostructureoftheproductshallcomplywiththerequirementsinTable4.Ifthebuyerhasspecialrequirements,itcanbedeterminedthroughnegotiationbetweenthesupplierandbuyer.

Table4Microstructure

ProductGrade

GradeAAA

GradeAA

GradeA

Microstructure

Columnarcrystalproportion≥90%

Noα-Fephaseobserved

Columnarcrystalproportion≥80%

Noα-Fephaseobserved

Columnarcrystalproportion≥70%

Noα-Fephaseobserved

4.5AppearanceQuality

4.5.1Theproductshallbeinas-castandirregularflakeform,withasilver-graymetalliclusteronthefracturesurface.

4.5.2Thesurfaceoftheproductshallbeflatandsmooth.Therollersurfacesideshallshowasilver-graymetallicluster,andthefreesurfacesideshallbesilver-grayorgray.Bothsidesareallowedtohaveslightdiscolorationandminordefectslikepockmarks,pores,scars,dents,androllermarks.

5TestMethods

5.1MainComponents

5.1.1TheanalysismethodfortheallowabledeviationofREcontentshallbecarriedoutinaccordancewithXB/T617.1.

5.1.2TheanalysismethodfortheallowabledeviationofsinglerareearthelementcontentshallbecarriedoutinaccordancewithXB/T617.2.

5.1.3TheanalysismethodfortheallowabledeviationofBcontentshallbecarriedoutinaccordancewithXB/T617.3.

5.2ImpurityComponents

5.2.1TheanalysismethodforCcontentshallbecarriedoutinaccordancewithXB/T617.6.

5.2.2TheanalysismethodsforNandOcontentsshallbecarriedoutinaccordancewithXB/T617.7.

5.2.3TheanalysismethodsforCa,Si,andMncontentsshallbecarriedoutinaccordancewithXB/T617.3.

5.3Thickness

5.3.1Randomlyselectnpiecesofproducts,anduseapointedorround-headedmicrometerorothermeasuringtoolswithanaccuracyofnotlessthan0.01mmtorandomlymeasurethethicknessofonepointforeachpieceofsample.

5.3.2CalculatetheaveragethicknesstofthenpiecesofsamplesaccordingtoFormula(1).Thepercentageofthenumberofsampleswiththicknesswithintherangeof(t±0.05)mmtothetotalnumberofmeasuredpiecesshallbetakenasthethicknessdistributionpercentage.

t=i=1Ntin………………(1)

Where:

t—Averagethicknessoftheproduct,inmillimeters(mm);

t?—Thicknessofthei-thpieceofproduct,inmillimeters(mm);

n—Numberofmeasuredsamples.

Thecalculationresultshallberoundedto2decimalplaces.

5.4Microstructure

TheinspectionmethodfortheproductmicrostructureshallbecarriedoutinaccordancewiththeprovisionsofAnnexB.

5.5AppearanceQuality

Inspectvisuallyundernaturalscatteredlight.

6InspectionRules

6.1InspectionandAcceptance

6.1.1Productsshallbeinspectedbythesupplierorathirdpartytoensurethattheproductqualitymeetstheprovisionsofthisdocument,andaproductqualitycertificateshallbefilledout.

6.1.2Thebuyershallinspectthereceivedproductsinaccordancewiththerequirementsofthisdocument.Iftheinspectionresultsareinconsistentwiththeprovisionsofthisdocument,thebuyershallsubmitawrittenproposaltothesupplierwithin3monthsfromthedateofreceivingtheproducts.Themattershallberesolvedthroughnegotiationbetweenthesupplierandbuyer.Ifarbitrationisrequired,itmaybeentrustedtoaunitrecognizedbybothparties,andsamplingshallbeconductedjointlyatthebuyer'slocation.

6.2Batching

Productsshallbesubmittedforinspectioninbatches.Eachbatchshallconsistofproductsfromthesamefurnaceandofthesamegrade,withamaximumweightof1000kgperbatch.

6.3InspectionItems

Themaincomponents,impuritycomponents,thickness,microstructure,andappearancequalityshallbeinspectedforeachbatchofproducts.

6.4Sampling

6.4.1SamplingWeight

ThesamplingweightforeachbatchofproductsshallbeinaccordancewiththerequirementsinTable5.Samplesshallberandomlytakenfromeachbatchofproductsandmixeduniformly.

Table5SamplingWeight

Unit:kilogram

BatchWeight

SamplingWeight

≤500

0.5

＞500

1.0

6.4.2Samplingformaincomponentsandimpuritycomponentsanalysis

Randomlytake100gfromthesamplesobtainedin6.4.1,crushthemintoparticleswithaparticlesizeoflessthan1mm,mixthemuniformly,take10gfromthemixedsamples,andquicklyputthemintoaplasticbagforvacuumpackaging.

6.4.3SamplingforThicknessInspection

Randomlytake100piecesfromthesamplesobtainedin6.4.1.

6.4.4SamplingforMicrostructureInspection

Randomlytake20piecesfromthesamplesobtainedin6.4.1.

6.4.5SamplingforAppearanceQualityInspection

Randomlytake100gfromthesamplesobtainedin6.4.1.

6.5JudgmentofInspectionResults

6.5.1ThenumericalvaluesofinspectionresultsshallberoundedinaccordancewiththeprovisionsofGB/T8170,andtheroundedvaluecomparisonmethodshallbeusedforjudgment.

6.5.2Iftheinspectionresultsoftheallowabledeviationofmaincomponentsorthecontentofimpuritycomponentsareinconsistentwiththeprovisionsofthisdocument,thebatchofproductsshallbejudgedasunqualified.

6.5.3Iftheinspectionresultsofthethicknessormicrostructureoftheproductareinconsistentwiththeprovisionsofthisdocument,doublesamplesshallbetakenfromthebatchofproductsforre-inspectionoftheunqualifieditems.Iftherearestillunqualifieditems,thebatchofproductsshallbejudgedasunqualified.

6.5.4Iftheinspectionresultoftheappearancequalityoftheproductisinconsistentwiththeprovisionsofthisdocument,theproductshallbejudgedasunqualified.

7Packaging,sign,transport,storageandaccompanyingdocuments

7.1Packaging,sign,transportandstorage

Thepackaging,sign,transport,andstorageofproductsshallcomplywiththeprovisionsofGB39176.

7.2AccompanyingDocuments

Eachbatchofproductsshallbeaccompaniedbyaccompanyingdocuments,whichshallincludeaqualitycertificatecomplyingwiththeprovisionsofGB39176.Inaddition,thefollowingdocumentsshallpreferablybeincluded:

a)Productcertificate;

b)Inspectionreportsduringproductqualitycontrolprocessandfinishedproductinspectionreports;

c)Productinstructionmanual;

d)Others.

AnnexA

(Informative)

ChemicalCompositionofStrip-castingNeodymiumIronBoronAlloyFlakes

Themaincomponentsofstrip-castingneodymiumironboronalloyflakesareneodymium(Nd),iron(Fe),andboron(B).Toobtaindifferentproperties,theneodymiumcontentinthematerialcanbepartiallyreplacedbyotherrareearthelementssuchaspraseodymium(Pr),cerium(Ce),dysprosium(Dy),terbium(Tb),etc.;theironcontentcanbepartiallyreplacedbyotherelementssuchascobalt(Co),copper(Cu),aluminum(Al),zirconium(Zr),niobium(Nb),gallium(Ga),titanium(Ti),etc.Thechemicalcompositionofstrip-castingneodymiumironboronalloyflakesisshowninTableA.1.

TableA.1ChemicalComposition

Component

Nd

TotalofPr,Ce,Dy,Tb,etc.

B

Co

TotalofCu,Al,Zr,Nb,Ga,Ti,etc.

Fe

Content(massfraction)

%

15~40

0~20

0.8~1.3

0~15

0~3

Balance

AnnexB

(Normative)

MicrostructureInspectionMethodforStrip-castingNeodymiumIronBoronAlloyFlakes

B.1Testmethod

Underamicroscope,measurethetotalcross-sectionalareaofthesample,theareaofnon-columnarcrystalregions,thenumberofgrains,etc.,tocalculatethewidthofcolumnarcrystalsandtheproportionofcolumnarcrystals.BasedonthedifferenceincharacteristicX-rayenergyemittedbydifferentelementsunderhigh-speedelectronbombardment,anenergy-dispersiveX-rayspectrometer(EDS)isusedtodetecttheα-Fephase.

B.2Apparatuses

B.2.1Opticalmetallographicmicroscope.

B.2.2Scanningelectronmicroscope,equippedwithanX-rayenergydispersivespectrometer(EDS).

B.3Samples

B.3.1Thesampletobetestedshallbemountedandfixedtoensurethatthecross-sectionalongthethicknessdirectionofthealloyflakeisthepolishedsurface,andthesampleshallbegroundandpolished.

B.3.2Determinewhethertoetchthesampleasneeded.Whenobservingwithanopticalmetallographicmicroscope,alow-concentrationnitricacid-alcoholsolutionisusuallyusedforetching;whenobservingwithbackscatteredelectronsignalsofascanningelectronmicroscope,etchingisgenerallynotrequired.

B.4Testingprocedures

B.4.1ProportionofColumnarCrystalRegions

Magnify200timesunderamicrosc