EN ISO 439:2020

SLOVENSKI STANDARD
01-april-2020
Nadomešča:
SIST EN ISO 439:2010
Jeklo in železove litine - Določevanje silicija - Gravimetrijska metoda (ISO
439:2020)
Steel and cast irons - Determination of silicon content - Gravimetric method (ISO
439:2020)
Stahl und Eisen - Bestimmung des Gesamtsiliziumgehaltes- Gravimetrisches Verfahren
(ISO 439:2020)
Aciers et fontes - Détermination de la teneur en silicium - Méthode gravimétrique (ISO
439:2020)
Ta slovenski standard je istoveten z: EN ISO 439:2020
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.

EN ISO 439
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 77.080.01 Supersedes EN ISO 439:2010
English Version
Steel and cast irons - Determination of silicon content -
Gravimetric method (ISO 439:2020)
Aciers et fontes - Détermination de la teneur en Stahl und Eisen - Bestimmung des
silicium - Méthode gravimétrique (ISO 439:2020) Gesamtsiliziumgehaltes - Gravimetrisches Verfahren
(ISO 439:2020)
This European Standard was approved by CEN on 1 February 2020.

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 439:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 439:2020) has been prepared by Technical Committee ISO/TC 17 "Steel" in
collaboration with Technical Committee CEN/TC 459/SC 2 “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 August 2020, and conflicting national standards shall
be withdrawn at the latest by August 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 ISO 439:2010.
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 439:2020 has been approved by CEN as EN ISO 439:2020 without any modification.

INTERNATIONAL ISO
STANDARD 439
Third edition
2020-02
Steel and cast iron — Determination of
silicon content — Gravimetric method
Aciers et fontes — Détermination des teneurs en silicium — Méthode
gravimétrique
Reference number
ISO 439:2020(E)
©
ISO 2020
ISO 439:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 439:2020(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 . 2
8 Procedure. 2
8.1 Test portion . 2
8.2 Blank test . 3
8.3 Determination . 3
8.3.1 Acid dissolution of the test portion and formation of hydrated silicon dioxide . 3
8.3.2 Filtration and washing . 3
8.3.3 Recovery of silicon compounds in the filtrate . 4
8.3.4 Ignition, volatilization of silicon dioxide and weighing . 4
9 Expression of results . 4
9.1 Method of calculation . 4
9.2 Precision . 5
10 Test report . 5
Annex A (informative) Additional information on the international interlaboratory test.7
Annex B (informative) Graphical representation of precision data .10
Bibliography .11
ISO 439:2020(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 on 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 the following URL:
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 1, Methods of
determination of chemical composition.
This third edition cancels and replaces the second edition (ISO 439:1994), which has been technically
revised. The main change compared to the previous edition is:
— a complete reevaluation of the precision data.
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 439:2020(E)
Steel and cast iron — Determination of silicon content —
Gravimetric method
1 Scope
This document specifies a gravimetric method for the determination of the silicon content in steel and
cast iron.
The method is applicable to silicon contents between 0,10 % (mass fraction) and 5,0 % {mass fraction).
NOTE For samples containing molybdenum, niobium, tantalum, titanium, tungsten, zirconium or high levels
of chromium, the results are less accurate than for unalloyed matrixes.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Principle
Dissolution of a test portion with hydrochloric and nitric acids.
Conversion of acid-soluble silicon compounds to hydrated silicon dioxide by evaporation with perchloric
acid until white fumes appear. Filtration of the hydrated silicon dioxide and acid-insoluble silicon
compounds, ignition to form impure silicon dioxide and then weighing.
Treatment of the ignited residue with hydrofluoric and sulfuric acids, followed by ignition and weighing.
5 Reagents
During the analysis, unless ot
...