Ductile Iron Types
High elongation of ductile iron,
the silicon’s content is low, the matrix is completely ferrite. Its
elongation is more than 20% and its high fatigue strength is more
easily meet the design requirements.
With this flexibility of ductile iron,
iron foundry can design a built-in torque rod for trucks
which can be bent to nearly 90 degrees in the destructive
experiments. Thin-wall casting technology increases the application
of this ductile iron in the cars. For example, the controlling arm,
the minimum wall thickness up to 2.5 cm. Compared with the stamping,
ductile iron parts have light weight, high strength, long fatigue
life which has great practical value in the automotive industry.
Ferrite Plus Pearlite Ductile Iron
The type of ductile iron differs greatly from the conventional
bovine pearlite plus ferrite ductile iron. It has high hardness and
fatigue strength and low temperature toughness.
This ductile iron
is mainly used to make components near the wheels in the truck. Such
as automotive front-wheel drive bush. Its excellent mechanical
properties and casting performance is significantly reduced
production costs, and lightweight the product.
Pearlitic Ductile Iron
Early, crankshafts were produced by forging, but the occurrence of
ductile iron makes extensive crankshafts produced by casting.
However, with increased engine power, the strength and wear
resistance of the crankshaft also have higher requirements.
Pearlitic ductile iron with high-strength and high wear resistance
can be made into hollow structure that not only reduce the quality
of the crankshaft, can ease the stress concentration around the
corner. China's current manufacturing crankshafts are solid
structures that have led to the emergence shrink bar in production.
In addition, the pearlitic ductile iron is also a good type of gear
Austenitic Plus Bainite Ductile Iron
Also known as ADI, it is received by austempering treatment. Even
though it is cast iron, but the tensile strength is more than
900Mpa, the elongation is higher than 10% and the hardness is up to
HB352-429. Good toughness and wear resistance are its advantages.
Another feature of ADI is that after shot peening or rolling
treatment, the hardness and fatigue strength will be significantly
improved, which make it possible that ADI replace carburizing or
high-frequency forged body. ADI gear has a light weight light noise,
vibration and low cost. However, because of poor cutting
performance, its application development is limited.
I believe that with the development of
iron casting and heat treatment technology, more and more
new ductile iron will play an important role in industrial