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AS 1831 for Ductile Cast Iron
AS 1831 2007 is an Australian standard for
ductile cast iron. The objective of this standard is to specify
grades of ductile cast irons by mechanical properties. This Standard
is identical with, and has been reproduced from ISO 1083:2004.
This International Standard does not apply to spheroidal graphite
cast iron used for pipes, fittings and accessories which are
specified in accordance with ISO 2531 and ISO 7186. It does not
apply to highly alloyed (austenitic) spheroidal cast irons which are
specified in accordance with ISO 2892. This International Standard
does not apply to ausferritic cast irons which are specified in
accordance with ISO 17804.
Ductile cast iron is also known as spheroidal graphite cast iron,
and less commonly as nodular iron. It is a kind of cast material,
iron and carbon-based, the carbon being present mainly in the form
of spheroidal graphite particles.
The following three tables have shown the main content of this
standard, and these information will be useful for the suppliers and
buyers for ductile iron castings.
Table 1- Mechanical properties measured on test
pieces machined from separately cast samples
|
Material designation |
Tensile strength
Rm
N/mm
min. |
0.2% proof stress
Rp0.2
N/mm
min |
Elongation
A
%
min |
|
ISO 1083/JS/350-22-LT/Sa |
350 |
220 |
22 |
|
ISO 1083/JS/350-22-RT/Sb |
350 |
220 |
22 |
|
ISO 1083/JS/350-22/S |
350 |
220 |
22 |
|
ISO 1083/JS/400-18-LT/Sa |
400 |
240 |
18 |
|
ISO 1083/JS/400-18-RT/Sb |
400 |
250 |
18 |
|
ISO 1083/JS/400-18/S |
400 |
250 |
18 |
|
ISO 1083/JS/400-15/S |
400 |
250 |
15 |
|
ISO 1083/JS/450-10/S |
450 |
310 |
10 |
|
ISO 1083/JS/500-7/S |
500 |
320 |
7 |
|
ISO 1083/JS/550-5/S |
550 |
350 |
5 |
|
ISO 1083/JS/600-3/S |
600 |
370 |
3 |
|
ISO 1083/JS/700-2/S |
700 |
420 |
2 |
|
ISO 1083/JS/800-2/S |
800 |
480 |
2 |
|
ISO 1083/JS/900-2/S |
900 |
600 |
2 |
|
NOTE 1: The values for these materials apply to castings
cast in sand moulds of comparable thermal behavior.
Subject to amendments to be agreed upon in the order, they
can apply to castings obtained by alternative methods.
NOTE 2: Whatever the method used for obtaining the castings,
the grades are based on the mechanical properties measured
on test prices machined from samples separately cast in a
and mould or a mould of comparable thermal behavior.
NOTE 3: The mechanical properties of the materials refer to
separately cast samples produced in accordance with Figures
1, 2 or 3.
NOTE 4: Elongation values are determined from Lo=5d. For
other gauge lengths, see 9.1 and Annex B.
NOTE 5: 1 N/mm 2 =1 MPa |
|
a. LT for low temperature (-20℃-40℃)
b. RT for room temperature (23℃) |
Impact test: The particular
impact resistance values given in Table 2 for room and low
temperature applications, if applicable, shall only be determined if
specified by the purchaser by the time of acceptance of the order.
Table 2 – Minimum impact resistance values
measured on V-notched test pieces machined from separately cast
samples.
|
Material designation |
Minimum impact resistance values
J |
|
room temperature
(23±5)℃ |
low temperature
(-20±2)℃ |
low temperature
(-40±2)℃ |
|
Mean value
From 3 tests |
Individual
value |
Mean value
From 3 tests |
Individual
value |
Mean value
From 3 tests |
Individual
value |
|
ISO 1083/JS/350-22-LT/Sa |
- |
- |
- |
- |
12 |
9 |
|
ISO 1083/JS/350-22-RT/Sb |
17 |
14 |
- |
- |
- |
- |
|
ISO 1083/JS/400-18-LT/Sa |
- |
- |
12 |
9 |
- |
- |
|
ISO 1083/JS/400-18-RT/Sb |
14 |
11 |
- |
- |
- |
- |
|
NOTE 1 The impact resistance values for these materials
apply to castings cast in sand moulds of comparable thermal
behavior. Subject to amendments to be agreed upon in the
order, they can apply to castings obtained by alternative
methods.
NOTE 2 Whatever the method used for obtaining the castings
the grades are based on the mechanical properties measured
on test prices machined from samples separately cast in a
sand mould or a mould of comparable thermal behavior.
NOTE 3 These material grades may be suitable for some
pressure vessel applications. (For fracture toughness, see
Annex C.)
|
|
a LT for low temperature.
b RT for room temperature. |
When only hardness is required,
the Brinell hardness values shall be as specified in Table 3.
When hardness is required in
addition to the tensile properties, the Brinell hardness values
shall be as specified in Table 3 and the procedure given in Table 3
is recommended.
Table 3 – Classification as a function of
hardness
|
Material designation |
Brinell hardness range
HBW |
Other properties a,b |
|
Rm
N/mm |
Rp0.2
N/mm |
|
ISO 1083/JS/HBW 130 |
less than 160 |
350 |
220 |
|
ISO 1083/JS/HBW 150 |
130 to 175 |
400 |
250 |
|
ISO 1083/JS/HBW 155 |
135 to 180 |
400 |
250 |
|
ISO 1083/JS/HBW 185 |
160 to 210 |
450 |
310 |
|
ISO 1083/JS/HBW 200 |
170 to 230 |
500 |
320 |
|
ISO 1083/JS/HBW 215 |
180 to 250 |
550 |
350 |
|
ISO 1083/JS/HBW 230 |
190 to 270 |
600 |
370 |
|
ISO 1083/JS/HBW 265 |
225 to 305 |
700 |
420 |
|
ISO 1083/JS/HBW 300c |
245 to 335 |
800 |
480 |
|
ISO 1083/JS/HBW 330c |
270 to 360 |
900 |
600 |
|
NOTE 1N/mm2 = 1 MPa |
|
a When only hardness is required, these properties are for
information
b When hardness is required in addition to tensile
properties, these properties provide an introductory step to
the procedure given in E.3
c ISO 1083/JS/ HBW 300 and ISO 1083/JS/ HBW 330 are not
recommended for thick section castings. |
By agreement between the
manufacturer and the purchaser, a narrower hardness range may be
adopted; a tolerance range of between 30 and 40 Brinell hardness
units is commonly acceptable. This hardness range may be wider for
grades with a ferritic-pearlitic matrix structure.
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