EN ISO 643:2012
Steels - Micrographic determination of the apparent grain size

Standard No.
EN ISO 643:2012
Release Date
2012
Published By
European Committee for Standardization (CEN)
Status
 2020-04
Replace By
EN ISO 643:2020
Latest
EN ISO 643:2020
Scope
This International Standard 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.

EN ISO 643:2012 history

  • 2020 EN ISO 643:2020 Steels - Micrographic determination of the apparent grain size (ISO 643:2019, Corrected version 2020-03)
  • 2012 EN ISO 643:2012 Steels - Micrographic determination of the apparent grain size
  • 2003 EN ISO 643:2003 Steels - Micrographic determination of the apparent grain size ISO 643: 2003



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