EN 2951:2019

SLOVENSKI STANDARD
01-september-2019
Aeronavtika - Kovinski materiali - Mikrografsko ugotavljanje deleža nekovinskih
vključkov
Aerospace series - Metallic materials - Micrographic determination of content of non-
metallic inclusions
Luft- und Raumfahrt - Metallische Werkstoffe - Mikrographische Bestimmung von
nichtmetallischen Einschlüssen
Série aérospatiale - Matériaux métalliques - Détermination par micrographie de la
distribution d'inclusions non-métalliques
Ta slovenski standard je istoveten z: EN 2951:2019
ICS:
49.025.10 Jekla Steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 2951
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 49.025.10
English Version
Aerospace series - Metallic materials - Micrographic
determination of content of non-metallic inclusions
Série aérospatiale - Matériaux métalliques - Luft- und Raumfahrt - Metallische Werkstoffe -
Détermination par micrographie de la distribution Mikrographische Bestimmung von nichtmetallischen
d'inclusions non-métalliques Einschlüssen
This European Standard was approved by CEN on 30 December 2018.

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: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2951:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Health and safety . 5
5 Test method . 6
6 Classification of inclusions . 6
7 Acceptance criteria . 6
Annex A (normative) Acceptance criteria – Categories . 8
A.1 Categories of acceptance . 8
A.2 Example of the use of combined field ratings . 9
Annex B (informative) Standard evolution form . 10

European foreword
This document (EN 2951:2019) has been prepared by the Aerospace and Defence Industries Association
of Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of
ASD, prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2019, and conflicting national standards shall
be withdrawn at the latest November 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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
the United Kingdom.
Introduction
This document is part of the series of EN metallic material standards for aerospace applications. The
general organization of this series is described in EN 4258.

1 Scope
This document specifies the general requirements for the micrographic determination of content of non-
metallic inclusions of metallic materials for aerospace applications.
It also gives tables of standard acceptance criteria for particular steel types.
It shall be applied when referred to in the EN technical specification or material standard unless
otherwise specified on the drawing, order or inspection schedule.
This document is mainly applicable to steel but may be used on other metallic materials.
This document is not normally applicable to austenitic corrosion resisting steel, other than precipitation
hardening, or to free-machining steel unless invoked in the material standards.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 4258, Aerospace series — Metallic materials — General organization of standardization — Links
between types of EN standards and their use
1)
EN 4259, Aerospace series — Metallic materials — Definition of general terms
2)
ASTM E45, Standard Test Methods for Determining the Inclusion Content of Steel
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 4259 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: availab
...