EN ISO 7526:2020

SLOVENSKI STANDARD
01-junij-2020
Nadomešča:
SIST EN 27526:2009
Feronikelj - Določevanje žvepla - Metoda z infrardečo absorpcijo po zgorevanju v
indukcijski peči (ISO 7526:2020)
Ferronickels - Determination of sulfur content - Infrared absorption method after
induction furnace combustion (ISO 7526:2020)
Ferronickel - Bestimmung des Schwefelgehalts - Infrarot-Absorptionsverfahren nach der
Verbrennung im Induktionsofen [Routineverfahren] (ISO 7526:2020)
Ferronickels - Détermination de la teneur en soufre - Méthode par absorption dans
l'infrarouge après combustion dans un four à induction (ISO 7526:2020)
Ta slovenski standard je istoveten z: EN ISO 7526:2020
ICS:
77.120.40 Nikelj, krom in njune zlitine Nickel, chromium and their
alloys
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 7526
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2020
EUROPÄISCHE NORM
ICS 77.100; 77.120.40 Supersedes EN 27526:1991
English Version
Ferronickels - Determination of sulfur content - Infrared
absorption method after induction furnace combustion
(ISO 7526:2020)
Ferronickels - Détermination de la teneur en soufre - Ferronickel - Bestimmung des Schwefelgehalts -
Méthode par absorption dans l'infrarouge après Infrarot-Absorptionsverfahren nach der Verbrennung
combustion dans un four à induction (ISO 7526:2020) im Induktionsofen [Routineverfahren] (ISO
7526:2020)
This European Standard was approved by CEN on 15 November 2019.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7526:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 7526:2020) has been prepared by Technical Committee ISO/TC 155 "Nickel and
nickel alloys" in collaboration with Technical Committee CEN/SS M14 “Nickel” the secretariat of which
is held by CCMC.
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 September 2020, and conflicting national standards
shall be withdrawn at the latest by September 2020.
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.
This document supersedes EN 27526:1991.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 7526:2020 has been approved by CEN as EN ISO 7526:2020 without any modification.

INTERNATIONAL ISO
STANDARD 7526
Second edition
2020-03
Ferronickels — Determination of
sulfur content — Infrared absorption
method after induction furnace
combustion
Ferronickels — Détermination de la teneur en soufre — Méthode
par absorption dans l'infrarouge après combustion dans un four à
induction
Reference number
ISO 7526:2020(E)
©
ISO 2020
ISO 7526:2020(E)
© ISO 2020
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
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 7526:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Sampling and sample preparation . 3
8 Procedure. 4
8.1 Preparing and stabilizing the instrument . 4
8.2 Blank test and zero adjustment . 4
8.2.1 Sulfur contents ≤ 0,05 % . 4
8.2.2 Sulfur contents > 0,05 % . 4
8.3 Calibration . 4
8.4 Determination . 5
9 Expression of results . 6
9.1 Calculation . 6
9.2 Precision . 6
10 Test report . 8
Annex A (informative) Features of commercial high frequency induction furnaces and
infrared sulfur analysers . 9
Annex B (informative) Composition of the samples used for the validation precision test .10
Annex C (informative) Graphical representation of the precision data .11
Bibliography .12
ISO 7526:2020(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 non-governmental, 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 155, Nickel and nickel alloys, in
collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/
SS M14, Nickel, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 7526:1985), which has been technically
revised. The main changes compared with the previous edition are as follows:
— the scope has been limited to ferronickels only;
— the former Clauses 5 and 7 have been technically revised;
— the former Annexes A and C have been deleted;
— the precision data have been updated.
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.
iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 7526:2020(E)
Ferronickels — Determination of sulfur content — Infrared
absorption method after induction furnace combustion
1 Scope
This document specifies an infrared absorption method after combustion in an induction furnace for
the determination of the sulfur content in ferronickels in the range of 0,002 % to 0,12 %.
The method is applicable to normal production operations. It uses commercially available equipment,
which is calibrated using steel and/or ferronickel certified reference materials (CRMs).
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
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