EN ISO 643:2003

Steels - Micrographic determination of the apparent grain size (ISO 643:2003) EN ISO 643:2003

Publication date:   Sep 12, 2003

General information

99.60 Withdrawal effective   Dec 19, 2012

CEN

CEN/TC 459/SC 1 Test methods for steel (other than chemical analysis)

European Norm

77.040.99   Other methods of testing of metals

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Scope

ISO 643 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

NOW

WITHDRAWN
EN ISO 643:2003
99.60 Withdrawal effective
Dec 19, 2012

REVISED BY

WITHDRAWN
EN ISO 643:2012