SIST EN ISO 945:1997

SLOVENSKI STANDARD
SIST EN ISO 945:1997
01-maj-1997
/LWRåHOH]R2]QDþHYDQMHPLNURVWUXNWXUHJUDILWD
Cast iron - Designation of microstructure of graphite (ISO 945:1975)
Gußeisen - Bestimmung der Mikrostruktur von Graphit (ISO 945:1975)
Fonte - Désignation de la microstructure du graphite (ISO 945:1975)
Ta slovenski standard je istoveten z: EN ISO 945:1994
ICS:
77.080.10 Železo Irons
SIST EN ISO 945:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 945:1997

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SIST EN ISO 945:1997

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SIST EN ISO 945:1997

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SIST EN ISO 945:1997
INTERNATIONAL STANDARD
iNTERNATIONAL ORGANIZATION FOR STANDARDIZATION l MEXjlYHAPOjlHA(I OPrAHM3AWi(I I-IO CTAHAAPTM3ALWM .ORGANISATION INTERNATIONALE DE NORMALISATION
Cast iron - Designation of microstructure of graphite
Fonte - Dbignation de la microstructure du graphite
First edition - 1975-I l-01
_- .-._
iii Ref. No. IS0 945-1975 (E)
UDC 669.13 : 003.62
-
Descriptors : cast iron, graphite, microstructure, designation, microscopic analysis.
Price based on 8 pages

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SIST EN ISO 945:1997
FOREWORD
IS0 (the International Organization for Standardization) is a worldwide federation
of national standards institutes (IS0 Member Bodies). The work of developing
International 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.
Prior to 1972, the results of the work of the Technical Committees were published
as IS0 Recommendations; these documents are now in the process of being
transformed into International Standards. As part of this process, Technical
Committee ISO/TC 25 has reviewed IS0 Recommendation R 945 and found it
technically suitable for transformation. International Standard IS0 945 therefore
replaces IS0 Recommendation R 945-1969 to which it is technically identical.
IS0 Recommendation R 945 was approved by the Member Bodies of the following
countries :
Belgium Greece Portugal
Brazil India Romania
Canada Ireland South Africa, Rep. of
Chile i sraef Sweden
Czechoslovakia Italy Switzerland
Egypt, Arab Rep. Of Korea, Rep. of Thailand
Finland Netherlands Turkey
Norway United Kingdom
France
Poland Yugoslavia
Germany
No Member Body expressed disapproval of the Recommendation.
The Member Bodies of the following countries disapproved the transformation of
ISO/R 945 into an International Standard :
Sweden
Switzeriand
@ international Organizatim for Siandardiza~ion, 1975 @
Printed in Switzerland

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SIST EN ISO 945:1997
INTERNATIONAL STANDARD IS0 945-1975 (E)
Cast iron - Designation of microstructure of graphite
1 SCOPE AND FIELD OF APPLICATION 3.2 The area of polished surface shall be sufficient to give
a true representation of the graphite distribution. Attention
This International Standard specifies a method of
shall be paid to the careful grinding and polishing of the
designating the microstructure of graphite in cast iron. It is
specimens in order that the graphite particles appear in
not intended as a basis for acceptance specifications.
their true form and size. The examination of the graphite
under the microscope is usually carried out on the unetched
polished section, though final etching is recommended in
2 GENERAL
the case of some special alloy cast irons,-for example those
2.1 When iron-carbon alloys are examined under a containing high silicon.
microscope, the graphite occurring in these alloys can be
classif ied by
4 MICROSCOPIC EXAMINATION
a) its form (designated by roman numerals, see
4.1 The polished specimens shall be viewed under a
figure 1);
microscope so that the entire polished area may be
b) its distribution (designated by capital letters, see
examined. A comparison shall first be made with the
figure 2);
reference diagrams for the graphite form and distribution
(see figures 1 and 2) and the microstructures observed shall
c) its size (designated by arabic numerals, see figures 3
then be identified from the corresponding reference
to 6).
diagrams. Following this, the size of the graphite particles
shall be determined at a magnification of 100 diameters, by
2.2 The three series of reference diagrams included in this
reference to figures 3 to 6 inclusive and/or the table.
International Standard for evaluating the type of graphite
form a basis for such a classification. The characteristic
4.2 Examination under the microscope can be carried out
features of the graphite which occur are designated by
by direct observation or by projection on the ground glass
letters and numerals. For this purpose, microstructures of
of the microscope. The field of view shall have
graphite are arranged side by side in the series. Form,
approximately the same size as the reference diagrams
distribution and size of the graphite observed are
(about 80 mm diameter).
determined by comparison with the diagrams and the
allocation of the same classification as that of the diagrams
4.3 The measurement of the graphite particles can be
that resemble them most closely. This method permits
facilitated by the use of suitable calibrated eye-pieces.
quick identification of the graphite, promotes mutual
understanding between technicians in this field, permits
4.4 The method described above gives good results, but
clear representation of the findings, facilitates statistical
any other method of ex
...