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1、INTERNATIONALISOSTANDARD643Thirdedition2012-12-15Steels—MicrographicdeterminationoftheapparentgrainsizeAciers—DéterminationmicrographiquedelagrosseurdegrainapparenteReferencenumberISO643:2012(E)--`,,```,,,,````-`-`,,`,,`,`,,`---CopyrightInternationalOrgani
2、zationforStandardization©ISO2012ProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermittedwithoutlicensefromIHSNotforResaleISO643:2012(E)--`,,```,,,,````-`-`,,`,,`,`,,`---COPYRIGHTPROTECTEDDOCUMENT©ISO2012Allrightsreserved.Unlessotherwisespecified
3、,nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherISOattheaddressbeloworISO'smemberbodyinthecountryoftherequester.ISOcopyrightofficeCasepostal
4、e56•CH-1211Geneva20Tel.+41227490111Fax+41227490947E-mailcopyright@iso.orgWebwww.iso.orgPublishedinSwitzerlandCopyrightInternationalOrganizationforStandardizationii©ISO2012–AllrightsreservedProvidedbyIHSunderlicensewithISONoreproductionornetworkingpermitted
5、withoutlicensefromIHSNotforResaleISO643:2012(E)ContentsPageForeword............................................................................................................................................................iv1Scope.........................
6、.............................................................................................................................12Normativereferences..............................................................................................................
7、..............13Termsanddefinitions...........................................................................................................................14Symbolsandabbreviatedterms......................................................................
8、....................................25Principle..................................................................................................................................................26Selectionandp
