Cast Iron in China
Cast iron mainly includes
ductile iron, malleable iron
and austenitic iron. In China, most of iron foundries could produce
grey iron and ductile iron, but seldom could produce malleable and
In China, most of iron foundries could produce the cast iron from
grey iron grade 150 to
ductile iron grade 600, and only few of them could produce ductile
iron upper than grade 600, such as grade 700, 800 and 900 since
higher grade will need higher requirements to the heat treatment.
Cast iron prices are mainly affected by the
pig iron prices, other material costs and manpower costs. Of
course, as for the clients overseas, the exchange rate of USD to RMB
will also be an important factor to the prices of
iron castings in China.
In China, the main production processes for cast iron include
automatic molding, lost
foam casting process, and seldom by investment casting process.
Because of the high melting temperature of cast iron, the most of
iron castings were produced by sand casting processes, only small
amount was made by investment casting process.
Honestly, the quality of cast iron in China is not as good as that
in USA, so if you want to purchase iron castings for automotive
industries, you should take a careful selection to cast iron
suppliers in China. However, as for the most of cast iron products,
most of good iron foundries in China could meet the requirements.
Most of iron foundries have the chemical and physical inspection
devices in-house, so the common quality inspection will not be a
problem. As for the impact test, hydraulic test and radiographic
test, most of foundries will have to entrust other labs or
inspectors to perform. As for the ultrasonic test, according to my
work experience in Dandong Foundry
in China, this test was not suitable for iron castings since x ray
test can not distinguish the similar inside
casting defects such
as air holes, shrinkage and low density.