Steels. Micrographic determination of the apparent grain size
77.040.99 - Other methods of testing of metals
EN ISO 643:2020
Reemplaza a: BS EN ISO 643:2012
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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