EN 10247:2017

European foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Principles
6 Brief practical guide
7 Sampling
8 Test method
9 Types of assessment
10 Test report
Annex A (normative) - Type of inclusions
Annex B (normative) - Parameters and assessments
        to be used if not otherwise specified
Annex C (informative) - Examples for inclusions of
        different types
Annex D (informative) - Shape factor
Annex E (informative) - Examples for magnification
Annex F (informative) - Details of the eyepiece graticules
Annex G (normative) - Manufacturing specifications
        of the eyepiece graticule
Annex H (normative) - Calculation basis for the
        pictures of the chart
Annex I (normative) - Rules for classification
Annex J (informative) - Comparison of inclusion types
        in different standards
Annex K (informative) - Worst inclusion assessment
Annex L (informative) - Worst field assessment
Annex M (informative) - Average field assessment
Annex N (normative) - Calculation basis for the
        assessment
Annex O (informative) - Edge Errors correction
Annex P (normative) - Calculation of average values
        of parameters for one class
Annex Q (normative) - Average values of parameters
Bibliography

This draft European Standard defines a method of microscopic non-metallic endogenous inclusion assessment using picture charts.The method does not apply to particles of a length or diameter less than 3,0 µm or a width smaller than 2,0 µm. If defined by a product standard or agreement between the involved parties for certain special products, inclusions with a width below 2,0 µm can be evaluated by length alone.Inclusions with dimensions exceeding the upper limits in Table 2 are evaluated as belonging to the maximum class and noted separately with their true dimensions (see 7.5.6).It is assumed, if particles are elongated or if there are stringers of particles, that they are parallel to each other. Other arrangements are not covered by this draft standard. This draft European Standard applies to samples with a microscopic precipitation approaching random distribution.From the data of measurements obtained by this method, evaluation according to other standards can be established.This draft European Standard does not apply to free cutting steels.NOTEThe basic principle of this draft European Standard allows the determination of non-metallic inclusion content by image analysis techniques.