The differences of iron foundries and steel foundries in China
In the past, one of our clients asked
about the differences of iron
foundries and steel foundries in China, herein, I made a
brief introduction about this issue, and hope this could be helpful
for other metal casting purchasers.
Firstly, both iron and steel foundries are the metal foundries, and
they use the similar casting process such as melting pig iron and
steel scarps, and then pour the hot liquid metal into casting molds,
then after cooling, get the designed metal castings, but they use
the different materials, equipments, heat treatment and have
different machining capability.
1. Material differences
Iron foundries usually use pig iron, iron and steel scraps as the
main materials, and need to add the nolularizing agents when
producing ductile iron, nodular iron.
Steel foundries usually use some pig iron specifically for cast
steel, and mainly steel scraps. As for the alloy steels, the steel
foundries need to add the alloys.
2. Molding materials
Iron foundries usually use
green sand, resin
sand and pre-coated resin sand as the molding materials, but
steel foundries will use the dry sand with water glass, wax and
water glass or silica sol as the molding materials.
3. Main equipments
In China, some iron foundries are still using cupola furnace as the
melting equipment. Most of iron foundries use the electric furnaces,
but almost all steel foundries are using electric furnaces.
Some iron foundries have molding machines or
automatic molding machines
to enhance the production rate, but steel foundries are still using
the manual floor molding process.
4. Heat treatment
Most of steel foundries in China have the heat treatment equipments,
especially using electric furnaces to do the heat treatment, but
iron foundries normally do not have heat treatment equipments since
normal iron castings do not need
the heat treatment.
5. Machining capability
Since iron castings usually have larger annual demand, so most of
Chinese iron foundries have the capability of machining in-house.
However, most steel foundries can not do the machining or just could
do the rough machining in-house.
All these differences are due to the different annual demand, the
production characters and technical requirements of iron and steel
castings. In the past years, there are large improvement for the
metal foundries in China, so there are many metal foundries in
China, who have advanced casting processes and strong machining
capability. Moreover, some foundries could even produce the metal