China foundry, iron
foundry, steel foundry, metal foundry, casting original manufacturer
(making ductile iron, gray iron, cast iron, cast
steel castings, machining capability, high quality, low price, ISO
certificate, ASTM standard, Chinese OEM foundry, green sand casting,
resin sand, shell molding, automatic molding, for agricultural
machinery, tractors, trucks, stove, tillage and seeding parts made
We are introducing a good iron and steel
foundry in China, Dandong Ruiding Foundry, including their main
materials, ductile iron, gray iron and cast steel, also their
casting processes, such as green sand, resin sand, shell molding,
automatic molding, and also their material standards, main products.
China Foundry: Dandong Ruiding Foundry
Dandong Foundry is a professional Cast Iron Foundry in Dandong City
China, with over 50 years experience producing Iron Castings, Steel
Castings and Machining.
ISO 9001 Quality Certified. Annual output 8000 tons of metal
castings, and 70% have been exported to USA, Australia, UK, Germany
and Italy etc.
Main materials: Ductile iron, gray iron, cast iron, cast steel
Our foundry mainly produce ductile iron (also called as S.G. iron,
nodular cast iron, spheroidal graphite cast iron), gray iron (also
called as grey cast iron), and also cast steel. We produce iron
castings in our own foundry, and entrust steel castings to our local
steel foundry partner. But we will be in charge of quality control.
Casting process: green sand, resin
sand, shell molding, automatic molding
Sand casting process means the main molding material is "sand".
According to the different sand materials, it can be divided into
green sand, resin sand, dry sand and shell molding processes.
Herein, we will try to elaborate them.
1. Green Sand
Green sand casting uses a kind of humid sand mixed with black clay.
This sand is cheap, and can be used repeatedly. So, it is suitable
for manual molding and automated machine molding. Green sand is the
cheapest sand casting process, and is also mostly used casting
process in China. This process is suitable to produce iron castings
with rough weights less than 100kg.
2. Resin Sand
Resin sand casting process uses furan resin sand as the molding
material. After burning, the resin sand can become hard sand, so it
is also called as hard mold casting process. Resin sand can be used
repeatedly either, however, it needs to replenish new furan sand
constantly. In 2011, the furan resin material became very costly, so
the resin sand castings became more costly. Resin sand casting
process is suitable to produce large iron castings with weights from
50kg to 2000kg.
3. Shell Molding
Shell molding process uses a kind of yellow phenolic resin sand.
This sand is more costly than furan resin sand, and phenolic resin
sand can not be used repeatedly, so it is one time molding sand.
Therefore, this process is more costly than furan resin sand.
However, shell molding process can meet higher requirements to the
rough casting surface quality, more complex inside structures, and
higher casting dimensional tolerances. So, it is widely used for
producing small iron castings with high requirements. In China, we
normally do not use shell molding process to produce steel castings,
however, in other countries, they do.
4. Automatic molding
Dandong Foundry uses FBO automatic molding line to produce iron
castings parts for vehicles, cars, trucks, tractors, plow points
The advantages of automatic molding are high production rate, good
dimensional tolerance, good surface quality, and very stable casting
However, the disadvantages are high metal pattern cost, high min.
order quantity, the limitation of size and unit weight of castings.
Material standards: ASTM A536 for
ductile iron, ASTM A48 for gray iron
ASTM A536 is our common material standard for ductile iron. We could
produce the material grades 60-40-18, 60-42-10, 65-45-12, 70-50-05,
80-55-06, 80-60-03, 100-70-03.
ASTM A48 is our common material standard for gray cast iron. We
could produce the material grades No.20, No. 25, No.30, No.35,
Main products: casting parts for agricultural machinery,
tractors, trucks, stoves, tillage and seeding parts
Our foundry has produced over 2000 types of agricultural machinery
parts, including tractor gear box, iron bracket, reducer shell, belt
pulley, cast iron cradle, iron support, brake drum, and axle
support, etc. We also produced many stove parts, stove base radiant,
grates, tillage knife points, seeding knife parts.