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EVS-EN ISO 643:2024

Steels - Micrographic determination of the apparent grain size (ISO 643:2024)

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Kehtiv alates 16.09.2024
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ISO 643:2024; EN ISO 643:2024
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Standardi ajalugu

Staatus
Kuupäev
Tüüp
Nimetus
16.09.2024
Põhitekst
03.02.2020
Põhitekst
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.

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