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ISO 643:2019

Steels -- Micrographic determination of the apparent grain size (Corrected version 2020-03)

General information
Valid from 12.12.2019
Directives or regulations
None
Standard history
Status
Date
Type
Name
12.12.2019
Main
10.12.2012
Main
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.
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