YST 491-2020《Flux for aluminium and aluminium alloy铝及铝合金用熔剂》.pdf

ICS71.100.10

CCSH30

YS

NonferrousMetalsIndustryStandardofthePeople’sRepublicofChina

YS/T491-2020

ReplaceYS/T491-2005

Fluxforaluminiumandaluminiumalloy

铝及铝合金用熔剂

（EnglishTranslation）

Issueddate:2020-12-9Implementationdate:2021-4-1

IssuedbyMinistryofIndustryandInformationTechnologyofthePeoplesRepublicofChina

I

YS/T491—201X

Foreword

SAC/TC243isinchargeofthisEnglishtranslation.Incaseofanydoubtaboutthecontents

ofEnglishtranslation,theChineseoriginalshallbeconsideredauthoritative.

ThisdocumentisdraftedinaccordancewiththerulesgivenintheGB/T1.1-2009.

ThisdocumentreplacesYS/T491-2005Fluxforaluminiumandaluminiumalloyinwhole，in

additiontoanumberofstructuraladjustmentsandeditorialchanges,thefollowingtechnical

deviationshavebeenmadewithrespecttotheYS/T491-2005：

——Revisednormativereferences(seeClause2,Clause2of2005edition)；

——Reviseddesignationrepresentation(seeClause3,3.1.1and3.1.2of2005edition);

——Revisedrequirementsforchemicalcomposition(see4.1,3.1.3of2005edition);

——Revisedrequirementsforproductappearance(see4.3,3.3of2005edition);

——Addedrequirementsforsievesize(see4.4);

——Revisedrequirementsforproductmoisture(see4.5,3.2of2005edition);

——Deleted“Other”technicalrequirements(see3.2of2005edition);

——Addedrequirementsforliquidustemperature(see4.6);

——Addedrequirementsforfluxusage(see4.7);

——Addedrequirementsforfluxpurificationeffect(see4.8);

——Revisedtestmethodsfordeterminingthechemicalcomposition(see5.1andAnnexA-Annex

L,4.1of2005edition);

——Revisedtestmethodfordeterminingthesieve