Historical
ISO 643:1983
Steels - Micrographic determination of the ferritic or austenitic grain size
Specifies the methods for revealing the grain and for estimating the mean size of the grain revealed. Includes a counting method (annex A) and determination of grain size by using of standard charts (annnexes B and C) taken from an AFNOR Standard and an ASTM document, respectively.
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International Organization for Standardization [iso]