Determination of ferrite content in austenitic stainless steel castings (ISO/DIS 13520:2022)

Procedures are covered for estimating ferrite content in certain grades of austenitic iron-chromium-nickel alloy castings that have compositions balanced to create the formation of ferrite as a second phase in amounts controlled within specified limits. Methods are described for estimating ferrite content by chemical, magnetic and metallographic means.

Bestimmung des Ferritgehaltes in austenitischem nichtrostenden Stahlguss (ISO/FDIS 13520:2022)

Es werden Verfahrensweisen zur Abschätzung von Ferritgehalten in bestimmten Sorten von Eisen-Chrom-Nickel-Gusslegierungen berücksichtigt, welche abgestimmte Zusammensetzungen zur Bildung von Ferrit, in kontrollierten Mengenanteilen und in festgelegten Grenzen, als Sekundärphase haben. Es werden Methoden zur Abschätzung der Ferritgehalte mittels chemischer, magnetischer und metallographischer Hilfsmittel beschrieben.

Détermination du taux de ferrite des pièces moulées en acier inoxydable austénitique (ISO/DIS 13520:2022)

Des modes opératoires sont donnés pour estimer le taux de ferrite de certaines nuances de pièces moulées en alliage austénitique de fer-chrome-nickel dont la composition est équilibrée pour provoquer la formation de ferrite en phase secondaire et en quantité maintenue dans des limites spécifiées. Les méthodes décrites permettent l'estimation du taux de ferrite par des procédés chimiques, magnétiques et métallographiques.

Določevanje feritov v avstenitnih ulitkih iz nerjavečega jekla (ISO/FDIS 13520:2022)

General Information

Status
Not Published
Publication Date
31-Dec-2023
Current Stage
6055 - CEN Ratification completed (DOR) - Publishing
Start Date
10-Mar-2023
Completion Date
10-Mar-2023

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SLOVENSKI STANDARD
oSIST prEN ISO 13520:2023
01-januar-2023

Določevanje feritov v avstenitnih ulitkih iz nerjavečega jekla (ISO/FDIS 13520:2022)

Determination of ferrite content in austenitic stainless steel castings (ISO/FDIS

13520:2022)

Détermination du taux de ferrite des pièces moulées en acier inoxydable austénitique

(ISO/FDIS 13520:2022)
Ta slovenski standard je istoveten z: prEN ISO 13520
ICS:
77.140.20 Visokokakovostna jekla Stainless steels
77.140.80 Železni in jekleni ulitki Iron and steel castings
oSIST prEN ISO 13520:2023 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 13520:2023
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oSIST prEN ISO 13520:2023
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 13520
ISO/TC 17/SC 11
Determination of ferrite content in
Secretariat: ANSI
austenitic stainless steel castings
Voting begins on:
2022-11-17
Détermination du taux de ferrite des pièces moulées en acier
inoxydable austénitique
Voting terminates on:
2023-02-09
ISO/CEN PARALLEL PROCESSING
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 13520:2022(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2022
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oSIST prEN ISO 13520:2023
ISO/FDIS 13520:2022(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 13520
ISO/TC 17/SC 11
Determination of ferrite content in
Secretariat: ANSI
austenitic stainless steel castings
Voting begins on:
Détermination du taux de ferrite des pièces moulées en acier
inoxydable austénitique
Voting terminates on:
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022
ISO/CEN PARALLEL PROCESSING

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
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DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 13520:2022(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
© ISO 2022 – All rights reserved
NATIONAL REGULATIONS. © ISO 2022
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oSIST prEN ISO 13520:2023
ISO/FDIS 13520:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Significance effects of ferrite content ........................................................................................................................................... 1

5 Methods of determination of ferrite content ......................................................................................................................... 2

5.1 Chemical composition method ................................................................................................................................................. 2

5.2 Magnetic response method ......................................................................................................................................................... 2

5.3 Metallographic examination ...................................................................................................................................................... 2

6 Ordering information ..................................................................................................................................................................................... 2

7 General caution ..................................................................................................................................................................................................... 2

8 Estimation of ferrite ......................................................................................................................................................................................... 3

9 Acceptance standards ....................................................................................................................................................................................3

10 Certification .............................................................................................................................................................................................................. 3

Annex A (normative) Determination of ferrite content by magnetic or metallographic

means ............................................................................................................................................................................................................................... 4

Annex B (informative) Notes to Schoefer diagram ............................................................................................................................... 6

Bibliography .............................................................................................................................................................................................................................11

iii
© ISO 2022 – All rights reserved
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oSIST prEN ISO 13520:2023
ISO/FDIS 13520:2022(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non­governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 11, Steel

castings, in collaboration with the European Committee for Standardization (CEN) Technical Committee

CEN/TC 459/SC 11, Steel castings and forgings, in accordance with the Agreement on technical

cooperation between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 13520:2015), of which it constitutes a

minor revision. The changes are as follows:

— ASTM A799 and BNIF 345 where moved to the bibliography as they are not cited normatively;

— editorial revision.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2022 – All rights reserved
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oSIST prEN ISO 13520:2023
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 13520:2022(E)
Determination of ferrite content in austenitic stainless
steel castings
1 Scope

Procedures are covered for estimating ferrite content in certain grades of austenitic iron­chromium­

nickel alloy castings that have compositions balanced to create the formation of ferrite as a second

phase in amounts controlled within specified limits. Methods are described for estimating ferrite

content by chemical, magnetic and metallographic means.
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.

ISO 4990, Steel castings — General technical delivery requirements

ISO 9042, Steels — Manual point counting method for statistically estimating the volume fraction of a

constituent with a point grid
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
ferrite

ferromagnetic, body-centred cubic microstructural constituent of variable chemical composition in

iron-chromium-nickel alloys
Note 1 to entry: Ferrite includes both delta and alpha species.
3.2
ferrite content

proportion of total volume of an iron-chromium-nickel alloy present as the ferrite phase

3.3
ferrite percentage
ferrite content expressed as a volume percent
4 Significance effects of ferrite content

The tensile and impact properties, the weldability, and the corrosion resistance of iron-chromium-

nickel alloy castings may be influenced beneficially or detrimentally by the ratio of the amount of ferrite

to the amount of austenite in the microstructure. The ferrite content may be limited by purchase order

requirements or by the design construction codes governing the equipment in which castings will be

used. The quantity of ferrite in the structure is fundamentally a function of the chemical composition

of the alloy and its thermal history. Because of segregation, the chemical composition and, therefore,

© ISO 2022 – All rights reserved
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oSIST prEN ISO 13520:2023
ISO/FDIS 13520:2022(E)

the ferrite content, may differ from point to point on a casting. Determination of the ferrite content by

any of the procedures described in Clause 5 is subject to varying degrees of imprecision which shall

be recognized in setting realistic limits on the range of ferrite content specified. Sources of error are

described in 5.1 to 5.3.
5 Methods of determination of ferrite content
5.1 Chemical composition method

Deviations from the actual content of each element present in an alloy because of chemical analysis

variance, although possibly minor in each case, can result in substantial difference in the ratio of total

ferrite­promoting to total austenite­promoting elements. Therefore, the precision of the ferrite content

estimated from chemical composition depends on the accuracy of the chemical analysis procedure.

The estimation of ferrite percent by means of the chemical composition offers the most useful and most

common method of ferrite control during melting of the metal.
5.2 Magnetic response method

Phases other than ferrite and austenite may be formed at certain temperatures and persist at room

temperature. Contamination from other ferromagnetic materials may also occur. These may so alter

the magnetic response of the alloy that the indicated ferrite content is quite different from that of the

same chemical composition that has undergone different thermal treatment. Also, because the magnets

or probes of the various measuring instruments are small, different degrees of surface roughness or

surface curvature will vary the magnetic linkage with the material being measured.

5.3 Metallographic examination
Metallographic point count estimates of ferrite percentage may vary with the et
...

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