NEN EN ISO 643 : 2013

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Principle
6 Selection and preparation of the specimen
  6.1 Test location
  6.2 Revealing ferritic grain boundaries
  6.3 Revealing austenitic and prior-austenitic grain
      boundaries
7 Characterization of grain size
  7.1 Characterization by an index
  7.2 Characterization by the intercept method
8 Test report
Annex A (informative) - Summary of methods for revealing
        ferritic, austenitic or prior-austenitic grain
        boundaries in steels
Annex B (normative) - Determination of grain size -
        Standard charts taken from ASTM E112
Annex C (normative) - Evaluation method

Defines a micrographic method of determining apparent ferritic or austenitic grain size in steels. Also explains the methods of revealing grain boundaries and of estimating the mean grain size of specimens with unimodal size distribution.