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60-40-18 ductile iron,
400-12 cast iron properties, hardness, chemistry and density
60-40-18 is ductile iron grade in standard
ASTM A536, 400-12 is ductile
iron material grade in Australia standard
AS 1831. 60-40-18
is equal designation as 400-12, but just has higher elongation. In
China, the equal grade is QT400-18 or QT400-15.
60-40-18 ductile iron, 400-12 cast iron properties
This cast iron grade is the lowest grade for ductile iron. Its
tensile strength is min. 414 Mpa (60.000 psi), its yield strength is
min. 276 Mpa (40.000 psi), and elongation is min. 18%. As for the
400-12 in Australian standard AS 1831, the elongation will be min.
12%.
Elongation is meaning that the test bar could be pulled and
lengthened by min. 18%. On this aspect, this material grade has the
best elongation property, which means it has best ductility.
Moreover, it has the best long temperature impact property. Because
of this good property, this material grade has been used widely.
60-40-18 ductile iron, 400-12 cast iron hardness
Hardness can not be taken as the inspection standard except that
clients have special requirements. However, normally, the ductile
iron castings made by this grade will be in the hardness range of
149-187 Brinell hardness.
Lower may mean that the material grade has not reached to this
grade, and higher hardness may cause the difficulty and low speed of
machining. So, normally, iron foundries should produce this grade of
ductile iron castings in this range. The hardness could be adjusted
by chemical composition.
60-40-18 ductile iron, 400-12 cast iron chemistry
According to the standard ASTM A536 and AS 1831, the cast iron
foundries could adjust the chemical composition by themselves as
long as the mechanical and physical properties of the castings could
meet the requirements in Standards.
However, there is an approximate chemical composition range as the
following. This range is just for reference, and can not be taken as
the inspection yard.
|
ASTM |
ISO |
C % |
Si % |
Mn % |
P % |
S % |
Mg % |
|
60-40-18 |
400-18 |
3.50-3.78 |
2.80-2.85 |
0.2-0.5 |
0.03-0.06 |
0.02-0.035 |
0.020-0.060 |
60-40-18 ductile iron, 400-12 cast
iron density
The density of this ductile iron grade is about 7.3 g/cm3.
60-40-18 ductile iron castings made in China foundry
These ductile iron castings were made by Dandong Foundry in China.
  
  
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