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

BS EN ISO 643:2020

Steels. Micrographic determination of the apparent grain size

Status : Current, Project Underway   Published : January 2020



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.

Standard NumberBS EN ISO 643:2020
TitleSteels. Micrographic determination of the apparent grain size
StatusCurrent, Project Underway
Publication Date23 January 2020
Normative References(Required to achieve compliance to this standard)ASTM E112
Informative References(Provided for Information)ISO 3785, ISO 14250
ReplacesBS EN ISO 643:2012
International RelationshipsEN ISO 643:2020,ISO 643:2019
Amended ByCorrigendum, May 2020; Corrigendum, April 2020
DescriptorsAustenitic steels, Steels, Ferritic steels, Metallography, Microscopic analysis, Grain size, Crystal microstructure, Ferrous metals, Crystal examination
Title in FrenchAciers. Détermination micrographique de la grosseur de grain apparente
Title in GermanStahl. Mikrophotographische Bestimmung der erkennbaren Korngröße
ISBN978 0 539 13719 4
File Size2.419 MB

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