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ISO 643:2024

Steels — Micrographic determination of the apparent grain size

Aug 22, 2024

General information

60.60     Aug 22, 2024

ISO

ISO/TC 17/SC 7

International Standard

77.040.99  

English   French  

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 643:2019

NOW

PUBLISHED
ISO 643:2024
60.60 Standard published
Aug 22, 2024

National adoptions

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

60.60   Standard published

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