ISO 439:1982

Steel and cast iron — Determination of total silicon — Gravimetric method

Aciers et fontes — Dosage du silicium total — Méthode gravimétrique

General Information

• Status: Withdrawn
• Publication Date: 31-Jul-1982
• Withdrawal Date: 31-Jul-1982
• ICS: 77.080 - Ferrous metals
• Technical Committee: ISO/TC 17/SC 1 - Methods of determination of chemical composition
• Drafting Committee: ISO/TC 17/SC 1 - Methods of determination of chemical composition
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 17-Mar-1994

Relations

• Revised: ISO 439:1994 - Steel and iron — Determination of total silicon content — Gravimetric method
• Effective Date: 15-Apr-2008

Standards Content (Sample)

International Standard 439
INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON*MEXAYHAPO/lHAR OPTAHII3AUWR no CTAH/lAF'TII3AUMHWRGANlSATlON INTERNATIONALE DE NORMALISATION
Steel and cast iron - Determination of total silicon -
Gravi metric met hod
Aciers et fontes - Dosage du silicium total - Méthode gravimétrique
First edition - 1982-11-15
I UDC 669.13/.14 : 543.21 : 546.28 Ref. No. IS0 439-1982 (E)
W
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Descriptors : steels, cast iron, chemical analysis, determination of content, silicon, gravimetric analysis.
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Foreword
IS0 (the International Organization for standardization) is a worldwide federation of
national standards institutes (IS0 member bodies). The work of developing Inter-
national Standards is carried out through IS0 technical committees. Every member
body interested in a subject for which a technical committee has been set up 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
International Standard IS0 439 was developed by Technical Committee ISO/TC 17,
Steel.
It was submitted directly to the IS0 Council, in accordance with clause 6.11.2 of part 1
of the Directives for the technical work of ISO. It cancels and replaces IS0
Recommendation R 439-1969, which had been approved by the member bodies of the
following countries :
Australia Greece Norway
Austria Hungary Poland
Belgium India Romania
Canada Iran South Africa, Rep. of
Israel
Czechoslovakia Sweden
Denmark Italy Switzerland
Thailand
Egypt, Arab Rep. of Japan
Finland Korea, Rep. of Turkey
France Netherlands United Kingdom
Germany, F. R. New Zealand USSR
The member body of the following country had expressed disapproval of the docu-
ment on technical grounds :
USA
0 International Organization for Standardization, 1982 O
Printed in Switzerland

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INTERNATIONAL STANDARD IS0 439-1982 (E)
Steel and cast iron - Determination of total silicon -
Gravimetric method
Perchloric acid, e about 1,’67 g/ml.
1 Scope and field of application 4.6
This International Standard specifies a gravimetric method for NOTE - It is also possible to use perchloric acid, Q 1,s g/ml.
the determination of total silicon in steel and cast iron.
Sulphuric acid, e about 1,83 g/ml, diluted 1 + 1.
4.7
The method is applicable to silicon contents between 0,lO and
8,O % (mlm).
5 Apparatus
NOTE - For steels containing tungsten, tantalum, niobium, zir-
conium, titanium or molybdenum, the results are less accurate than for
Ordinary laboratory apparatus and
unalloyed steels.
Platinum crucibles, capacity approximately 30 ml.
5.1
2 Reference
5.2 Muffle furnace, adjustable from 800 up to 1 100 OC.
IS0 37/12, Selection and preparation of samples and test
pieces of wrought steels - Part 2 : Samples and test pieces in-
6 Sampling
tended for the determination of the chemical composition.’)
Sampling shall be carried out in accordance with IS0 377/2, or
appropriate national standards for cast iron.
3 Principle
7 Procedure
Dissolution of a test portion in hydrochloric and nitric acids.
Conversion of silica into hydrated silica by fuming with per-
WARNING - Perchloric acid vapour may cause explo-
chloric acid. Filtration of the hydrated silica, ignition of the im-
sions in the presence of ammonia, nitrous fumes or
pure silica and then weighing. Treatment of the ignited residue
organic material in general.
with hydrofluoric and sulphuric acids, followed by ignition and
weighing.
7.1 Test portion
Millings or drillings of a maximum thickness of 0,2 mm.
4 Reagents
According to the presumed silicon content, weigh, to the
nearest 0,001 g, the following mass (mol of the test portion :
During the analysis, unless otherwise stated, use only reagents
of recognized analytical grade and only distilled water or water
a) for Si contents between 0,lO and 0,50 % (m/m) : mo
of equivalent purity.
about 5 g;
b) for Si contents between 0.50 and 2,5 % (m/m) : mo
Hydrochloric acid, e about 1,19 g/ml.
4.1
about 2,5 g;
for Si contents between 2,5 and 8,O % (m/m) : mo
c)
4.2 Hydrochloric acid, diluted 1 + 1.
about 1 g.
4.3 Hydrochloric acid, diluted 1 + 19.
7.2 Blank test
Nitric acid, e about 1,42 g/ml, diluted 3 + 1.
4.4
In parallel with the determination of the content and following
the same procedure, carry out a blank test using the same
4.5 Hydrofluoric acid, e about 1,14 g/ml. quantities of all reagents.
1) At present at the stage of draft. (Partial revision of ISO/R 377-1964.)
1

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