NF EN ISO 643

NF EN ISO 643

January 2020
Standard Cancelled

Steels - Micrographic determination of the apparent grain size

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.

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Main informations

Collections

National standards and national normative documents

Publication date

January 2020

Number of pages

32 p.

Reference

NF EN ISO 643

ICS Codes

77.040.99   Other methods of testing of metals

Classification index

A04-102

Print number

2 - 01/09/2021

International kinship

ISO 643:2019

European kinship

EN ISO 643:2020
Sumary
Steels - Micrographic determination of the apparent grain size

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.

Replaced standards (1)
NF EN ISO 643
April 2013
Standard Cancelled
Steels - Micrographic determination of the apparent grain size

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.

Standard replaced by (1)
NF EN ISO 643
September 2024
Standard Current
Steels - Micrographic determination of the apparent grain size

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.

Table of contents
  • Avant-propos
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Symboles
  • 5 Principe
  • 6 Sélection et préparation de l'échantillon
  • 7 Caractérisation de la grosseur de grain
  • 8 Rapport d'essai
  • Annexe B (normative) Méthode d'évaluation
  • Annexe A (informative) Résumé des méthodes de mise en évidence des joints de grains ferritiques, austénitiques et préausténitiques dans les aciers
  • Bibliographie
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