EN 10247:2017

Micrographic examination of the non-metallic inclusion content of steels using standard pictures

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.
NOTE   The basic principle of this draft European Standard allows the determination of non-metallic inclusion content by image analysis techniques.

Metallographische Prüfung des Gehaltes nichtmetallischer Einschlüsse in Stählen mit Bildreihen

Dieser Europäische Normentwurf legt ein Verfahren zur mikroskopischen Kennzeichnung von nichtmetallischen endogenen Einschlüssen unter Verwendung von Richtreihenbildern fest.
Das Verfahren gilt nicht für Teilchen mit einer Länge oder einem Durchmesser kleiner als 3,0 µm oder einer Breite kleiner als 2,0 µm. Sofern in einer Produktnorm oder durch Vereinbarung zwischen den Beteiligten für spezielle Produkte festgelegt, können Einschlüsse mit einer Breite kleiner als 2,0 µm ausschließlich nach ihrer Länge bewertet werden. Einschlüsse, deren Maße die in Tabelle 2 angegebenen oberen Grenzen überschreiten, werden als zugehörig zur größten Klasse gewertet und gesondert mit ihren tatsächlichen Maßen aufgezeichnet (siehe 7.5.6).
Es wird vorausgesetzt, falls Teilchen gestreckt sind oder falls zeilenförmige Anordnungen von Teilchen auftreten diese parallel zueinander liegen. Andere Anordnungen werden durch diesen Normentwurf nicht berück¬sichtigt. Dieser Europäische Normentwurf gilt für Proben mit mikroskopischen Agglomerationen unter der Annahme einer makroskopisch regellosen Verteilung.
Aus den mit den hier beschriebenen Verfahren erzielten Messwerten kann eine Auswertung nach anderen Normen abgeleitet werden.
Dieser Europäische Normentwurf gilt nicht für Automatenstähle.
ANMERKUNG   Das Grundprinzip dieses Europäischen Normentwurfes ermöglicht die Bestimmung des Gehaltes an nichtmetallischen Einschlüssen mittels Bildanalysetechnik.

Détermination micrographique de la teneur en inclusions non-métalliques des aciers à l'aide d'images-types

Ce projet de Norme européenne définit une méthode de cotation des inclusions microscopiques endogènes non-métalliques à l'aide d'images types.
La méthode ne s'applique pas aux particules de longueur ou diamètre inférieure à 3,0 µm ou de largeur inférieure à 2,0 µm. Lorsque cela est défini dans la norme de produit ou par accord entre les parties intéressées, les inclusions de largeur inférieure à 2,0 µm peuvent être évaluées uniquement selon leur longueur. Les inclusions allongées de longueur supérieure aux limites indiquées au Tableau 2 sont comptées comme faisant partie de la classe maximum et notées séparément avec leurs dimensions réelles (voir 7.5.6)
Il est admis que si les particules sont allongées ou si elles sont en amas, elles sont parallèles entre elles. D'autres dispositions ne sont pas couvertes par ce projet de Norme. Ce projet de Norme européenne s'applique aux échantillons présentant une ségrégation microscopique présentant une distribution au hasard.
À partir des données des mesures obtenues par la présente méthode, une évaluation selon d'autres normes peut être établie.
Ce projet de Norme européenne n'est pas adapté aux aciers de décolletage.
NOTE   Le principe de base de ce projet de Norme européenne permet la détermination de la teneur inclusionnaire par les techniques d'analyse d'image.

Mikrografsko ugotavljanje deleža nekovinskih vključkov v jeklih z uporabo standardnih slik

Ta osnutek evropskega standarda opredeljuje metodo mikroskopskega ugotavljanja deleža nekovinskih vključkov v jeklih z uporabo slik.
Metoda se ne uporablja za delce dolžine ali premera manj kot 3,0 μm ali širine, manjše od 2,0 μm. Če tako določa standard za izdelek ali sporazum med vpletenimi strankami za določene posebne izdelke, je mogoče ugotoviti delež vključkov s širino pod 2,0 μm samo po dolžini. Ugotavljanje deleža vključkov z merami, ki presegajo zgornje meje v tabeli 2, se izvaja ob predpostavki, da pripadajo najvišjemu razredu in se posebej zabeležijo s svojimi dejanskimi dimenzijami (glej 7.5.6).
Če so delci podolgovati ali če obstajajo ostanki delcev, se predpostavlja, da so med seboj vzporedni. Druge ureditve niso zajete v osnutku tega standarda. Ta osnutek evropskega standarda se uporablja za vzorce z mikroskopskimi usedlinami, ki se približujejo naključni porazdelitvi.
Iz podatkov meritev, pridobljenih s to metodo, je mogoče izvesti vrednotenje v skladu z drugimi standardi.
Ta osnutek evropskega standarda se ne uporablja za avtomatna jekla.
OPOMBA: Osnovno načelo tega osnutka evropskega standarda omogoča določanje vsebnosti nekovinskih vključkov s pomočjo tehnik za analizo slike.

General Information

• Status: Published
• Publication Date: 11-Jul-2017
• Withdrawal Date: 30-Jan-2018
• ICS: 77.040.99 - Other methods of testing of metals
• Technical Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Drafting Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Completion Date: 29-May-2024
• Ref Project: SIST EN 10247:2017 - Micrographic examination of the non-metallic inclusion content of steels using standard pictures

Relations

• Replaces: EN 10247:2007 - Micrographic examination of the non-metallic inclusion content of steels using standard pictures
• Effective Date: 10-Jul-2013

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2017
0LNURJUDIVNRXJRWDYOMDQMHGHOHåDQHNRYLQVNLKYNOMXþNRYYMHNOLK]XSRUDER
VWDQGDUGQLKVOLN
Micrographic examination of the non-metallic inclusion content of steels using standard
pictures
Metallographische Prüfung des Gehaltes nichtmetallischer Einschlüsse in Stählen mit
Bildreihen
Détermination micrographique de la teneur en inclusions non-métalliques des aciers à
l'aide d'images- types
Ta slovenski standard je istoveten z: EN 10247:2017
ICS:
77.040.99 Druge metode za Other methods of testing of
preskušanje kovin metals
77.080.20 Jekla Steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 10247
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2017
EUROPÄISCHE NORM
ICS 77.040.99 Supersedes EN 10247:2007
English Version
Micrographic examination of the non-metallic inclusion
content of steels using standard pictures
Détermination micrographique de la teneur en Metallographische Prüfung des Gehaltes
inclusions non-métalliques des aciers à l'aide d'images- nichtmetallischer Einschlüsse in Stählen mit Bildreihen
types
This European Standard was approved by CEN on 18 January 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10247:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Symbols and abbreviations . 10
5 Principles . 12
6 Brief practical guide . 13
6.1 Basic rules for evaluation . 13
6.2 Evaluation according to the default rating methods . 14
7 Sampling . 14
7.1 General . 14
7.2 Degree of reduction . 15
7.3 Size and location of test area . 15
7.4 Number of specimens . 15
7.5 Preparation of specimens . 16
8 Test method . 16
8.1 Magnification . 16
8.2 Microscope settings for image analysis and manual analysis . 16
8.3 Field of view . 17
8.4 Definition of the pictures of the chart . 17
8.4.1 Size and Shape . 17
8.4.2 Parameters . 17
8.4.3 Arrangement of the pictures . 17
8.5 Procedure. 18
8.5.1 General . 18
8.5.2 Several inclusions of mixed sizes in one field . 18
8.5.3 Scanning . 18
8.5.4 Assessment and evaluation . 19
8.5.5 Evaluation of different types of inclusions . 19
8.5.6 Recording of results . 19
9 Types of assessment . 19
9.1 Worst inclusion method: method P . 19
9.1.1 Principle . 19
9.1.2 Evaluation of P (worst length) . 20
L
9.1.3 Evaluation of P (worst diameter). 20
d
9.1.4 Evaluation of P (worst area) . 20
a
9.2 Worst field method: method M. 20
9.2.1 Principle . 20
9.2.2 Evaluation of M (rating according to number) . 20
n
9.2.3 Evaluation of M (rating according to length) . 20
L
9.2.4 Evaluation of M (rating according to diameter) . 20
d
9.2.5 Evaluation of M (rating according to area) . 21
a
9.3 Average field method: method K . 21
9.3.1 Principle . 21
9.3.2 Scanning of a specimen for average field assessment . 21
9.3.3 Evaluation. 21
9.3.4 Evaluation of K , K for elongated and K , K for globular inclusions. 21
n L n d
9.3.5 Evaluation of K and K . 22
n a
10 Test report . 22
Annex A (normative) Type of inclusions . 34
Annex B (normative) Parameters and assessments to be used if not otherwise specified . 37
Annex C (informative) Examples for inclusions of different types . 38
Annex D (informative) Shape factor . 42
Annex E (informative) Examples for magnification . 43
Annex F (informative) Details of the eyepiece graticules . 45
Annex G (normative) Manufacturing specifications of the eyepiece graticule. 46
G.1 General . 46
G.2 Narrow field microscopes. 46
G.3 Broad field microscopes . 48
Annex H (normative) Calculation basis for the pictures of the chart . 50
Annex I (normative) Rules for classification . 52
I.1 Definition of classes . 52
I.2 Classification of length . 52
I.3 Classification of width . 52
I.4 Classification of diameter . 52
Annex J (informative) Comparison of inclusion types in different standards . 53
Annex K (informative) Worst inclusion assessment . 54
Annex L (informative) Worst field assessment . 58
L.1 General . 58
L.2 Evaluation of M . 58
n
L.3 Evaluation of M , M and M . 58
n L d
L.4 Evaluation of M and M . 58
n a
Annex M (informative) Average field assessment . 62
M.1 General . 62
M.2 Evaluation of K , K and K . 62
n L d
M.3 Evaluation of K and K . 62
n a
M.4 Restricted asse
...