Reference number
ISO 643:2019
© ISO 2025
ISO 643:2019
Steels — Micrographic determination of the apparent grain size
Edition 4
2019-12
Withdrawn
Withdrawn (Edition 4, 2019)

Abstract

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.

General information

  • Status
     : Withdrawn
    Publication date
     : 2019-12
    Corrected version (fr)
     : 2023-11
    Stage
    : Withdrawal of International Standard [95.99]
  • Edition
     : 4
    Number of pages
     : 21
  • Technical Committee :
    ISO/TC 17/SC 7
    ICS :
    77.040.99 
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Life cycle

Sustainable Development Goals

This standard contributes to the following Sustainable Development Goals

9
Industry, Innovation and Infrastructure
8
Decent Work and Economic Growth

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