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ISO 643:2024
Steels — Micrographic determination of the apparent grain size
SKU: iso_082221_187297
Published by ISO
Publication Year 2024
5 Edition
46 pages
Product Details
This document specifies micrographic methods 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.