Ductile Iron Casting Manufacturers
Ductile iron casting manufacturers should
be the iron foundries with machining capability, or the machining
workshops with raw castings sourcing capability. The trading
companies are just buy and sell the finished casting parts, so they
are not manufacturers, however, they are still contributing their
works to the exporting business.
Herein, let us introduce the current conditions of
iron foundries and
1. Iron Foundries with Machining Equipments
The typical ductile iron foundries should have the following casting
equipments and workshops:
a) Casting equipments, such as resin sand, green sand, shell molding
sand treatment equipments.
b) Melting equipments, such as electric
furnaces and cupola.
c) Spheroidizing inoculation equipments,
such as inoculation station.
d) Heat treatment equipments. As for the
ductile iron DIN 1693 GGG40,
GGG50 and GGG60 grades, no need special heat treatment, but for
higher grades such as GGG70 and GGG80, the heat treatment is
e) Casting clearance equipments, such as
sand blasting and grinding equipments, and welding equipments.
f) Painting and packing equipments.
g) Mechanical and chemical inspection
Some middle and large iron foundries in
China have their own machining workshops and could complete the
rough and finish machining works in house.
Iron foundries are still the main force
of ductile iron casting manufacturers. Most foundries could
manufacture ductile iron ASTM A536
60-40-18, 60-42-10, 65-45-12, 70-50-05, 80-60-03, only few foundries
could produce higher ductile iron grades 100-70-03 and 120-90-02.
However, recently years, because of the global crisis, the pig iron,
resin and other materials have been more expensive, moreover, the
workers' salaries have been increased largely too, therefore, more
and more ductile iron casting manufacturers have been closed,
therefore, the prices of castings have been increased largely too.
2. Machining Companies with Raw Castings Sourcing Capability
In China, there are some small, middle and large machining
workshops. They have various types of milling, lathe, grinding,
drilling, planning machines and CNC centers, so they could complete
the high precision machining works.
Moreover, most of machining companies
have some local partners who could supply the raw castings to them,
therefore, many machining workshops have been the final ductile iron
The advantages for these professional machining workshops are the
a) They could complete various high precision machining works, so
could manufacture high precision ductile iron castings.
b) They could deal with many types of
casting materials, except of ductile
iron, such as grey iron, steel, alloy and aluminum
However, they also have some disadvantages:
a) They are not familiar with the raw castings as the foundries, so
sometimes, they can not control and inspect the raw castings quality
b) Because of the trading with the
foundries, there will be some taxes, which will cause the final high
c) The unstable cooperation between the
machining companies and foundries will cause the risk to their
clients, such as unstable prices, delivery time and qualities.
There are many companies and many types of suppliers that could be
the good ductile iron casting manufacturers. As a buyer for ductile
iron castings, you need to check their production workshops and main
products from their websites, so could know that if they could
manufacture your products very well.