The Property of Ductile Cast Iron
The shape of the graphite is sphere, so
cast iron is called ductile cast iron, or nodular iron. The graphite
cast irons increase the machinery property, especially plasticity
and tenacity, so increase the intensity.
The history of ductile cast iron
In 1981, the specialists in China had used modern science measures
to study 513 iron implements which come up out of the ground, refer
to the vast information; we can conclude that the ductile cast iron
occurs in the Han dynasty in China. In ancient, China had used soft
method to produce ductile cast iron; this is very meaning in the
The property of ductile cast iron
Most of the casting fields have used ductile cast iron, because
these fields demand cast iron which has high intensity, plasticity,
tenacity and good abrasion resistant, heat resistant and corrosion
The related knowledge of the ductile cast iron
1. In automobiles aspect
Pearlites and ferrite ductile cast iron have used in the base plates
parts in the automobiles, this indicates that the ductile cast iron
products have reached to a high level and the gap between China and
international technology is reducing.
2. The factors of metallurgy
Adding proper rare earth complex spheroiditic agent, compel cooling,
concrete in order and adding small Sb and Bi can prevent the middle
part of the ductile cast iron loose and distortion.
3. Austenite-bainite ductile cast iron
In 20th century 70 times, austenite-bainite ductile cast iron was
produced successfully in China, American and Finland. The intensity
of this materials reach to 1000MPa, so it used widely in gears and
any kind of construction parts, compared to alloy steel, austenite-bainite
ductile cast iron have more prominent economic effects.
4. Mechanical property and other property of ductile cast iron
We have studied the mechanical property and other property of
tombarthit magnesium ductile cast iron, such as specific gravity,
heat conduction and electromagnetism, besides; we have studied the
effect of graphite to the property of ductile cast iron.
5. Ductile cast iron tubes
Recently, China has built several ductile cast iron tubes factories
and will build more. In 2000 the volume of ductile cast iron tubes
reached to 90 thousand tons, in the future, China will produce
itself production line to produce more ductile cast iron tubes.
Nowadays, the development of ductile cast iron is just second to the
gray cast iron, because its comprehensive property is close to the
steel, so it is used widely.