EN-GJS-400 Ductile Iron
The ductile iron grade of EN-GJS-400 is
from Germany standard DIN EN 1563. It has been replaced by the
standard DIN 1693, so the EN-GJS-400 has been changed into GGG40.
However, according to the DIN EN 1563, this grade should include
four grades as EN-GJS-400-15, EN-GJS-400-18, EN-GJS-400-18LT and
EN-GJS-400-18RT. So, the EN-GJS-400 has been changed into GGG40, and
the other three grades has been changed into GGG40.3. Therefore,
when you see the GGG40.3 on the drawings, you must pay more
attention to the elongation (18%) and their impact requirements in
the low temperature.
Physical properties of EN-GJS-400
Tensile strength min.400 Mpa, Yield strength min. 250 Mpa,
Elongation min. 15%, Hardness range 130-180 HBS. Microstructure is
mainly ferrite. As for the physical properties of GGG40.3, please
check the standard DIN 1693.
Chemical components of EN-GJS-400
There is no requirement for the chemical components in any standard,
as long as the iron foundries could make the ductile iron castings
to meet the physical properties, then these castings will be
qualified and will be taken to meet the standards.
However, according to the experiences of
Dandong Foundry in
China, the following chemical components should be a reasonable
range for the production. C: 3.50-3.78%, Si: 2.80-2.85%, Mn:
0.2-0.5, P: 0.03-0.06, S: 0.02-0.035, Mg: 0.042-0.060.
Advantages of EN-GJS-400 ductile iron
EN-GJS-400 ductile iron, also called as
nodular iron, is a very good and common cast iron. It has
good tensile strength and yield strength, and the largest elongation
compared with other ductile iron grades. Moreover, it has the best
impact property, casting and machining functions. Therefore,
EN-GJS-400 ductile iron has been widely used in the pressure pipes
and fittings, automotive applications, agriculture, road and
construction applications and many general engineering applications.
Problems of EN-GJS-400 ductile iron
Besides of the common sand casting defects, such as sand holes, air
holes, shrinkage, cracks and deformation, EN-GJS-400 ductile iron
has an important requirement for the percent of spheroidization, or
called as nodularity, spheroidization rate. Although this property
is not required in the standards, but many iron castings used in
automotive applications will require very high spheroidization rate
as 85%, 90%, 95% or higher.