SIST EN ISO 439:2010

SLOVENSKI STANDARD
SIST EN ISO 439:2010
01-julij-2010
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Steel and iron - Determination of total silicon content - Gravimetric method (ISO
439:1994)
Stahl und Eisen - Bestimmung des Gesamtsiliziumgehaltes - Gravimetrisches Verfahren
(ISO 439:1994)
Aciers et fontes - Dosage du silicium total - Méthode gravimétrique (ISO 439:1994)
Ta slovenski standard je istoveten z: EN ISO 439:2010
ICS:
77.080.01 Železne kovine na splošno Ferrous metals in general
SIST EN ISO 439:2010 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 439:2010

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SIST EN ISO 439:2010


EUROPEAN STANDARD
EN ISO 439

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2010
ICS 77.080.01
English Version
Steel and iron - Determination of total silicon content -
Gravimetric method (ISO 439:1994)
Aciers et fontes - Dosage du silicium total - Méthode Stahl und Eisen - Bestimmung des Gesamtsiliziumgehaltes
gravimétrique (ISO 439:1994) - Gravimetrisches Verfahren (ISO 439:1994)
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 439:2010: E
worldwide for CEN national Members.

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SIST EN ISO 439:2010
EN ISO 439:2010 (E)
Contents Page
Foreword .3

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SIST EN ISO 439:2010
EN ISO 439:2010 (E)
Foreword
The text of ISO 439:1994 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 439:2010 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 439:1994 has been approved by CEN as a EN ISO 439:2010 without any modification.

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SIST EN ISO 439:2010

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SIST EN ISO 439:2010
INTERNATIONAL
ISO
STANDARD 439
Second edition
1994-04-01
Steel and iron - Determination of total
- Gravimetric method
silicon content
Aciers et fontes - Dosage du silicium total - Methode gravimbtrique
Reference number
ISO 439:1994(E)

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SIST EN ISO 439:2010
ISO 439:1994(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. Esch 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.
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.
International Standard ISO 439 was prepared by Technical Committee
lSO/TC 17, Steel, Subcommittee SC 1, Methods of determination of
Chemical composition.
This second edition cancels and replaces the first edition (ISO 439:1982 1 l
which has been technically revised.
Annexes A and B of this International Standard are for information only.
0 ISO 1994
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l Cl-i-1 211 Geneve 20 l Switzerland
Printed in Switzerland

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SIST EN ISO 439:2010
ISO 439:1994(E)
INTERNATIONAL STANDARD 0 ISO
Steel and iron - Determination of total Silicon
content - Gravimetric method
ISO 3696: 1987, Water for analytical labora tory use -
1 Scope
Specifica tion and test methods.
This International Standard specifies a gravimetric
ISO 5725:1986, Precision of test methods - Deter-
method for the determination of the total Silicon con-
mination o f repeatability and reproducibility for a
tent in steel and iron.
Standard test method by inter-laboratory tests.
The method is applicable to Silicon contents between
0,lO % (m/m) and 5,0 % (m/m) (see note 1).
3 Principle
NOTE 1 For samples containing molybdenum, niobium,
Attack of a test Portion by hydrochloric and nitric
tantalum, titanium, tungsten, zirconium or high levels of
acids.
chromium, the results are less precise than for unalloyed
steels (see annex AL
Conversion of acid-soluble Silicon compounds to hy-
drated Silicon dioxide by evaporation with perchloric
acid until white fumes appear. Filtration of the hy-
drated Silicon dioxide and acid-insoluble Silicon com-
pounds, ignition to form impure Silicon dioxide and
2 Normative references
then weighing.
The following Standards contain provisions which,
Treatment of the ignited residue with hydrofluoric and
through reference in this text, constitute provisions
sulfuric acids, followed by ignition and weighing.
of this International Standard. At the time of publica-
tion, the editions indicated were valid. All Standards
4 Reagents
are subject to revision, and Parties to agreements
based on this International Standard are encouraged
During the analysis, unless otherwise stated, use only
to investigate the possibility of applying the most re-
reagents of recognized analytical grade and grade 2
cent editions of the Standards indicated below.
water as specified in ISO 3696.
Members of IEC and ISO maintain registers of cur-
rently valid International Standards.
4.1 Hydrochlorit acid, p about 1 ,19 g/ml.
ISO 377-2: 1989, Selection and preparation of samples
and test pieces of wrought steels - Part 2: Samples
4.2 Hydroch oric acid, p about 1 ,19 g/ml, diluted
for the determination of the Chemical composition.
1 +l.
ISO 385-1 :1984, Laboratory glassware - Burettes -
Part 1: General requiremen ts.
4.3 Hydroch
oric acid, p about 1 ,19 g/ml, diluted
1+19.
ISO 648: 1977, Laboratory glassware - One-mark
pipe ttes.
4.4 Nitrit acid, p about 1,40 g/ml, diluted 3 + 1 l
ISO 1042: 1983, Laboratory glassware - One-mark
4.5 Hydrofluoric
volumetric flasks. acid, p about 1,14 g/ml.

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SIST EN ISO 439:2010
0 ISO
ISO 439:1994(E)
4.6 Perchlorit acid, p about 1,67 g/ml (see note 2).
7.2 Blank test
NOTE 2 Perchlorit acid (p about 1,54 g/ml) may also be
In parallel with the determination and following the
used.
same procedure, carry out a blank test using the same
quantities of all the reagents.
4.7 Sulfuric acid, p about 1,83 g/mI, diluted 1 + 1.
7.3 Determination
5 Apparatus
7.3.1 Acid attack of the test Portion and
formation of hydrated Silicon dioxide
All volumetric glassware shall be class A, in accord-
ante with ISO 385-1, ISO 648 or ISO 1042, as appro-
Place the test Portion (7.1) in a beaker of acid-resistant
priate.
glass of suitable capacity.
Ordinary laboratory apparatus, and
Add 30 ml of hydrochloric acid (4.1), and then gently
heat the beaker covered with a watch glass until the
5.1 Platinum crucibles,
...