EN ISO 15351:2010

SLOVENSKI STANDARD
01-julij-2010
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Steel and iron - Determination of nitrogen content - Thermal conductimetric method after
fusion in a current of inert gas (Routine method) (ISO 15351:1999)
Stahl und Eisen - Bestimmung des Stickstoffgehalts - Messung der Wärmeleitfähigkeit
nach Aufschmelzen in strömendem Inertgas (Routineverfahren) (ISO 15351:1999)
Aciers et fontes - Dosage de l'azote - Méthode par conductibilité thermique après fusion
sous gaz inerte (Méthode pratique) (ISO 15351:1999)
Ta slovenski standard je istoveten z: EN ISO 15351:2010
ICS:
77.080.01 Železne kovine na splošno Ferrous metals in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 15351
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2010
ICS 77.080.01
English Version
Steel and iron - Determination of nitrogen content - Thermal
conductimetric method after fusion in a current of inert gas
(Routine method) (ISO 15351:1999)
Aciers et fontes - Dosage de l'azote - Méthode par Stahl und Eisen - Bestimmung des Stickstoffgehaltes -
conductibilité thermique après fusion sous gaz inerte Messung der Wärmeleitfähigkeit nach Aufschmelzen in
(Méthode pratique) (ISO 15351:1999) strömendem Inertgas (Routineverfahren) (ISO 15351:1999)
This European Standard was approved by CEN on 18 March 2010.

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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15351:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
The text of ISO 15351:1999 has been prepared by Technical Committee ISO/TC 17 “Steel” of the International
Organization for Standardization (ISO) and has been taken over as EN ISO 15351:2010 by Technical
Committee ECISS/TC 102 “Methods of chemical analysis for iron and steel” the secretariat of which is held by
SIS.
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 October 2010, and conflicting national standards shall be withdrawn at
the latest by October 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 15351:1999 has been approved by CEN as a EN ISO 15351:2010 without any modification.

INTERNATIONAL ISO
STANDARD 15351
First edition
1999-12-01
Steel andiron—Determinationof nitrogen
content — Thermal conductimetric method
after fusion in a current of inert gas
(Routine method)
Aciers et fontes — Dosage de l'azote — Méthode par conductibilité
thermique après fusion sous gaz inerte (Méthode pratique)
Reference number
ISO 15351:1999(E)
©
ISO 1999
ISO 15351:1999(E)
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ii © ISO 1999 – All rights reserved

ISO 15351:1999(E)
Contents Page
1 Scope .1
2 Normative references .1
3 Principle.2
4 Reagents and materials .2
5 Apparatus .2
6 Sampling.3
7 Procedure .3
8 Expression of results .5
9 Test report .6
Annex A (informative) Features of commercial resistive electrode furnaces and nitrogen analysers .7
Annex B (informative) Additional information on the international cooperative tests .9
Annex C (informative) Graphical representation of precision data .11
© ISO 1999 – All rights reserved iii

ISO 15351:1999(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 15351 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 1,
Methods of determination of chemical composition.
Annexes A, B and C of this International Standard are for information only.
iv © ISO 1999 – All rights reserved

INTERNATIONAL STANDARD ISO 15351:1999(E)
Steel andiron—Determinationofnitrogencontent—Thermal
conductimetric method after fusion in a current of inert gas
(Routine method)
1 Scope
This International Standard specifies a thermal conductimetric method after fusion under inert gas for the
determination of nitrogen in steel and iron.
The method is applicable to nitrogen contents between 0,002 % (m/m) and 0,6 % (m/m).
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO Guide 31:1981, Contents of certificates of reference materials.
ISO Guide 35:1989, Certification of reference materials –– General and statistical principles.
ISO 385-1:1984, Laboratory glassware — Burettes — Part 1: General requirements.
ISO 648:1977, Laboratory glassware — One-mark pipettes.
ISO 1042:1998, Laboratory glassware — One-mark volumetric flasks.
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods.
ISO 5725-1:1994, Accuracy (trueness and precision) of measurement methods and results — Part 1: General
principles and definitions.
ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method
for the determination of repeatability and reproducibility of a standard measurement method.
ISO 5725-3:1994, Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate
measures of the precision of a standard measurement method.
ISO 10702:1993, Steel and iron –– Determination of nitrogen content –– Titrimetric method after distillation.
ISO 10720:1997, Steel and iron –– Determination of nitrogen content –– Thermal conductimetric method after
fusion in a current of inert gas.
ISO 14284:1996, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition.
© ISO 1999 – All rights reserved 1

ISO 15351:1999(E)
3Principle
Fusion of a test portion in a single-use graphite crucible under helium gas at a high temperature (e.g. 2 200 �C).
Extraction of the nitrogen in the form of molecular nitrogen in the stream of helium.
Separation from the other gaseous extracts and measurement by thermal conductimetric method.
Calibration graph established using steel or iron certified reference materials (CRM).
NOTE The accuracy of the method is largely dependant upon the accuracy of the method used to certify the nitrogen
concentration of CRMs as well as upon their homogeneity. These calibration specimens shall be ECRM, NIST, JK, JSS, CMSI
and other national or international CRMs.
4 Reagents and materials
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only grade 3
water as specified in ISO 3696.
4.1 Water, prepare just before use.
4.2 Helium, high purity, total impurity content 0,000 5 % (m/m).
An oxidation reagent or catalyst [copper(II) oxide or platinum] tube heated to a temperature above 450 �C shall be
used prior to a purifying unit, when the presence of organic contaminants is suspected in the helium.
4.3 Copper (II) oxide, on granulated support.
4.4 Magnesium perchlorate Mg (ClO ) (commercial designation: anhydrone), particle size: from 1,2 mm to
4 2
2 mm, or anhydrous calcium sulfate, (commercial designation: drierite), particle size from 0,6 mm to 0,85 mm.
4.5 Sodium hydroxide, on granulated support (commercial designation: ascarite), particle size: from 0,7 mm to
1,2 mm.
4.6 Appropriate solvent, suitable for washing greasy or dirty test samples, e.g. acetone.
4.7 Steel or iron reference materials (RM), one or more of whose property values are sufficiently
homogeneous as described in ISO Guide 35 and well-established for use in the calibration of an apparatus, the
assessment of a measurement method or for assigning values to materials.
4.8 Steel or iron certified reference materials (CRM), steel or iron reference materials (4.7), accompanied by
a certificate in accordance with ISO Guide 31 and one or more of whose chemical element concentrations have
been established, in accordance with ISO Guide 35, by a referee method (e.g. ISO 10702 and 10720) which
establishes its traceability to an accurate realization of the unit in which the property values are expressed, and for
which each certified value is accompanied by an uncertainty at a stated level of confidence.
5 Apparatus
During the analysis, unless otherwise stated, use only o
...