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üDC 669.131.3
IS0
O R G A N 1 Z AT I O N FOR STAN DARD I ZATl O N
I N T ERN AT I O N A L
IS0 RECOMMENDATION
R 1083
SPHEROIDAL GRAPHITE OR NODULAR GRAPHITE
CAST IRON
1st EDITION
May 1969
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 1083, Spheroidal graphite or nodular graphite cast iron, was drawn up by
Technical Committee ISO/TC 25, Cast iron, the Secretariat of which is held by the British Standards Institution
(BSI).
Work on this question led to the adoption of a Draft IS0 Recommendation.
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In March 1968, this Draft IS0 Recommendation (No. 1510) was circulated to ail the IS0 Member Bodies
i
for enquiry. It was approved, subject to a few modifications of an editorial nature, by the following Member
Bodies :
Australia India Romania
Belgium Iran South Africa, Rep. of
Canada Israel Switzerland
Chile
Italy Thailand
Colombia
Japan Turkey
Czechoslovakia Netherlands U.A.R.
France Poland United Kingdom
Germany Portugal U.S.S.R.
Four Member Bodies opposed the approval of the Draft :
Finland
Norway
Sweden
U.S.A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council, which decided,
in May 1969, to accept it as an IS0 RECOMMENDATION.
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ISO/R 1083-1969 (E)
IS0 Recommendation R 1083 May 1969
SPHEROIDAL GRAPHITE OR NODULAR GRAPHITE
CAST IRON
1. SCOPE
1.1 This IS0 Recommendation relates to spheroidal graphite or nodular graphite cast iron. The
classification herein has been prepared on the basis of the mechanical properties.
1.2 Spheroidal graphite cast iron is a casting material, iron and carbon based, the latter element being
present principally as graphite particles in spheroidal form.*
2. PRODUCTION-CASTING
The method of producing spheroidal graphite cast iron, together with its composition and, if applicable, the
heat treatment, are left to the discretion of the manufacturer, who should ensure that the property require-
ments defined in this IS0 Recommendation are complied with for the grade required in the order.
However, for cast iron to be used in special applications, the chemical composition may be agreed between
purchaser and manufacturer.
3. MECHANICAL PROPERTIES
This IS0 Recommendation relates to five types of spheroidal graphite cast iron, the mechanical properties of
which are shown in Tables 1 and 2.
Corresponding to Form VI of IS0 Recommendation R 945, Designation of the microsîrucfure of graphite in cast iron.
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ISO/R 1083-1969 (E)
TABLE 1 - Tensile strength, proof stress and elongation properties
and additional information
Tensile strength (R,) :longation**
0.2 proof stress [R, (0.2)]
For information only
min. (A) min.
min.
-
Typical
Brinell Predominant
hardness structural
gf/mm2 Ibf/in2 tonf/in2 Ibf/in2 tonf/in2
.gf/mn
value constituent
* * * *
-
70 100000 44 45 2
70-2 65 O00 29
40 57 O00 25 2 (210 - 280 HBI Pearlite
60 -2 60 86000 38
50 71 O00 31 35 50 O00 22 7 170 - 240 HB Pearlite
50-7
I I{ Ferrite
42-1 2 42 60000 26 28 40 O00 17
38-17 38 55 O00 24 24 35 O00 15
TABLE 2 - Impact values for type 38-17 only
Minimum impact value
kgf.m/cm2
Test piece
(on 3 tests) value
V-notch (Charpy) in
accordance with
ISO/R 148*
U-notch (Mesnager) in
accordance with
Figure 5 (page 12)
~
*
Beam impact test (V-notch) for steel.
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ISO/R 1083-1969 (E)
4. MECHANICAL TESTS
4.1 Tensile test
This test should b carried out on a 14 mm diamet r proportional test piece, as shown in Figure 4 on
page 1 1.
If, for technical reasons, it is necessary to use a test piece with a different diameter, it should comply
with the ratio
Lo = 5.65
where
is the original cross-sectional area of the test piece, and
So
is the original gauge length.
Lo
4.2 Impact test
This test is specified only for type 38-17 cast iron.
it should be carried out either on a V-notch (Charpy) test piece in accordance with IS0 Recommendation
R 148* or on a U-notch (Mesnager) test piece in accordance with IS0 Recommendation R 83** except
that the dimensions of the U-notch in the test piece should be in accordance with Figure 5 on page 12.
The results should be expressed in kilogramme-force metres per square centimetre.
5. TEST SAMPLES
5.1 The test pieces used for the tests specified in section 4 should be machined from “U”-type test samples
as specified in Figure 1 on page 9. Alternatively, the mechanical properties may be measured using test
pieces as shown in Figure 4, machined from either the “l‘”-type test sample (see Fig. 2) or the “knock-off’
type (see Fig. 3), for which the casting procedure is optional.
Test samples (often called keel blocks) should be poured at the same time as the castings represented
5.2
(see clause 5.3 below).
Test pieces should be taken from the keel of the “U”-type test sample (the hatched section of Fig. 1).
In princ
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