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ISO 643:2019

Historical Revision

Steels - Micrographic determination of the apparent grain size

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This document specifies a micrographic method of determining apparent ferritic or austenitic grain size in steels. It describes the methods of revealing grain boundaries and of estimating the mean grain size of specimens with unimodal size distribution. Although grains are three-dimensional in shape, the metallographic sectioning plane can cut through a grain at any point from a grain corner, to the maximum diameter of the grain, thus producing a range of apparent grain sizes on the two-dimensional plane, even in a sample with a perfectly consistent grain size.


SDO ISO: International Organization for Standardization
Document Number ISO 643
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO/TC 17/SC 7
Publish Date Document Id Type View
Not Available ISO 643:2024 Revision
Not Available ISO 643:2019 Revision