How to calculate the price of rough iron castings
As a buyer for iron castings, you may
always wonder how to estimate the reasonable prices of your iron
casting parts, to evaluate the quotations from your potential
suppliers. Since the machining costs are more complex, so we can not
make it clear in one article, but as for the price of rough
castings, we can briefly introduce its main aspects.
Rough casting cost means the price for the rough castings without
any machining, heat treatment, surface coating, packing and freight
Iron foundries usually make the quotation for rough castings based
on their rough weights. For example, if currently the price rate of
green sand castings is about 1.35 USD/kg, and the rough casting
weight of your iron part is 10 kg, then its cost is 13.5 USD/pc.
However, you must know some important factors.
1. Rough weight of castings
One is the rough casting weight is usually 5% to 40% higher than
machined castings. For example, if your finished or machined part is
10 kg, then its rough casting weight may be 10.5 to 17.0 kg. Do not
be surprised! This is possible and reasonable. Almost all
professional iron foundries will calculate the rough casting costs
by this way. Even the iron foundries are in charge of the machining,
they still need to calculate the rough casting cost by this way,
because the machining iron chips will become the scraps and very
cheap. Although the iron foundries may reduce the price rate
considering the extremely high machining allowance, but they still
calculate by the rough casting weights.
2. Suitable casting process
Secondly, the green
sand casting process is the cheapest production process. If
your parts need to use the
resin sand casting process,
shell molding process,
investment casting process or others, then price rate will
not be 1.35 USD/kg, and will cost more. You could check the website
of dandong foundry in China, then
you will see the latest price rates for all
sand casting processes.
3. Material grades of iron castings
Thirdly, if the material of your parts are not normal
grey cast iron, but grey
iron of high grades, such as ASTM A48
Class 45 or 50, ductile iron
or alloy cast iron, then the price rate will be higher.
4. Complexity of Castings
Fourthly, if your casting parts are very complex, especially with
complex inside structures, then it will be more expensive since they
will need more sand cores and production time.
5. Sizes of iron castings
Fifthly, if your casting parts are very small, such as under 2kg,
then their price rates will be higher than normal weights because of
more production time and more cleaning and grinding works.
In addition, the annual demand is always
a important factor to the price of rough castings and machining. The
iron foundries will consider to reduce the prices for the orders
with large annual demand. Likewise, they will consider to increase
the prices for the small orders.
Moreover, the all of iron foundries in
China will calculate their production costs by RMB yuan, therefore,
you should take the exchange rate of RMB to USD into consideration.
If the exchange rate changes over 2%, then the price of USD should
be adjusted accordingly.
After talking so much, you must be still confused about the prices
of rough iron castings. Yes, this is reasonable since only the
professional iron foundries and engineers could make the accurate
quotation based on your drawings, however, you still could check the
website of Dandong Foundry
to get an approximate price.