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ISO 643:2012

Steels -- Micrographic determination of the apparent grain size

This document has been re-assessed by the committee, and judged to still be up to date.

ISO 643:2012 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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Supersedes

ISO 643:2003

Publishing information

Status: SUPERSEDED

Published: 10/12/2012

Pages: 35

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77.040.99 Other methods of testing metals