ISO 643:2019

Steels — Micrographic determination of the apparent grain size

Publication date: 12 dhj 2019

95.99 Withdrawal of Standard 22 gush 2024

General information

Current stage: 95.99 Effective date: 22 gush 2024

Originator: ISO

Owner: ISO/TC 17/SC 7

Type: International Standard

ICS: 77.040.99

Gjuha: anglisht

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Statusi: Shfuqizuar

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 643:2012

NOW

WITHDRAWN
ISO 643:2019
95.99 Withdrawal of Standard
22 gush 2024

REVISED BY

PUBLISHED
ISO 643:2024