Cast Iron Price Guide
As for buyers for cast iron casting
products, a price guide is necessary for evaluating the quotations
However, cast iron price is a complex issue, because an accurate
price is related to many aspects, such as rough casting weight, cast
iron material grades, heat treatment, production processes,
machining works, surface coating and anti-rust protection, also need
to considerate the technical requirements to the material,
dimensional tolerance and casting defects.
Herein, we try to summarize the composition of an accurate
quotation, and all related concerns. This guide can not make you
become an price expert, but at least, it could help you to
understand the quotations.
1. Cast Iron Material Grades
The production costs for different cast iron grades are different.
Please refer to our article Cast Iron
Grades to learn about the material grades.
Tips: Before you place the inquiry, please
check if you have denoted the cast iron grades in the inquiry or on
2. Casting Production Processes
The cast iron casting prices have been seriously affected by
production processes. For example:
Shell molding process is the most
Furan resin coated sand casting
process is more costly than green sand.
Green sand by manual and molding
equipments is the cheapest casting process.
As for the difference of these sand
casting processes, please refer to our article
Sand Casting Process.
Tips: Check what casting processes your
supplier will be used to produce your parts. Suitable and cheap
casting process will be the good choice.
3. Rough Casting Weight and Machining Allowance
Some buyers did not care about the unit weight, but the unit weight
is very important to prices. The unit weight of rough castings are
the base of rough casting prices. The rough weight is also related
to the machining allowance. Larger machining allowance will cause
larger of rough weight.
Tips: If you know the rough weight or machined
weight, you should tell your supplier during quotation, otherwise,
their quotation will not be accurate, which may cause your trouble
in the future.
4. Machining Tolerance and Costs
Higher and tighter machining tolerance will require more complex and
high precision machining equipments, so will cause higher machining
Tips: Denote as detailed as possible for
machining tolerance and surface finish requirements, which will help
your suppliers to quote an accurate machining costs.
5. Extra Heat Treatment Requirements
As for the low and middle grades of gray iron, ductile iron and
carbon steel castings, no need for extra heat treatment, so no need
to consider the heat treatment costs either. However, as for the
high grades or alloy steel castings, the extra heat treatment costs
should be considered. Such as the hardening and tempering, or called
as quenching treatment.
Tips: Both buyers and suppliers should pay
attention to the hardness requirements, which may cause the extra
heat treatment costs.
6. Pattern Types and Costs
There are several types of patterns used to produce metal castings,
such as iron patterns, aluminum patterns, resin pattern (also called
as plastic pattern) and wooden patterns. The patterns should be
chosen according to the quality requirements, annual demand and
production processes. Different patterns will cause very different
costs, so need to be paid attention to during quotation.
As for the various pattern types and their costs, please refer to
our article pattern for
Tips: Ask your supplier to denoted the pattern
types in the quotation, then evaluate if they have chosen the
7. Price Influence of Annual Demand and Unit Weight
Annual demand is small, then their
unit price will be higher.
Annual demand is large, then their
unit price will be lower.
Unit weight is small, then their
price per kg will be higher.
Unit weight is large, then their
price per kg will be lower.
the casting foundry will not offer you any discount if you increase
the annual demand. The annual demand is just an important reference
during quotation, but it will not bring you an discount.
8. Complexity of Casting Design
More complex casting will mean more moulding work time, and more
materials for sand cores, also more higher defective rate. So, the
complexity of casting design will cause big difference to prices.
9. Dimensional Tolerance Requirement
Both dimensional tolerance requirements to rough castings and
machining will be good reference for suppliers to consider the
suitable casting production processes, and machining equipments, so
they will affect the related casting and machining costs too.
Tips: The buyers should clearly denote all
dimensional tolerance requirements on the drawings.
10. Extra Requirements to Cast Iron Materials
If there are only material grades on the drawings, and requirements,
then the material will not be a problem for the suppliers to
understand the technical requirements, however, for special
application, the cast iron parts may need extra requirements to the
materials, such as to the nodularity rate, pearlite content, carbon
residue content, hardness etc. These extra requirements will affect
the production process, raw iron material or alloy nodulizing agent
etc. So, affect the casting prices.
Tips: Buyers should clearly denote all
material requirements on the drawings or in the requirement
documents, and should inform their suppliers if it is necessary.
11. Surface Finish Smoothness to Rough Casting and Machined
The requirements to the surface finish smoothness degree to rough
castings and machined surfaces will cause the selection to the
casting process processes and machining works, so affect the prices
to the machined parts.
As for the comparison of the machined surface finish degrees, please
refer to our article
Machining surface finish chart, comparator, method, degree, Ra,
12. Surface Coating and Anti-Rust Protection
As for the normal anti-rust primer painting, normally, the suppliers
will be able to consider and include their costs in the quotation.
This cost is only about 0.05 USD/kg based on the casting weight.
However, if the buyers have the requirements to the special coating
and painting, such as finish painting, zinc plating, hop dip
galvanizing, anti-heat coating, powder coating, electophoretic
coating etc, then the coating cost will be much more higher.
Tips: The buyers should denote the
requirements on the drawing or in the inquiry, and notice if the
manufacturers have considered these costs in the quotation.
13. Casting Defects Requirements to Outside Surface and Inside
As for sand molding castings, casting defects are inevitable. Some
on the surfaces, some inside. So, the requirements to the defects
are also an important influence factors to the prices.
Higher casting defects requirements will cause higher production
costs, and will cause the higher defective rate before delivery.
Tips: If the buyers have special requirements
to the casting defects, you should tell the suppliers in advance.
14. Exchange Rate of Currency Influence
As for all metal foundries in China, the production costs and prices
were calculated by RMB currency. When they made the quotation, they
just change the RMB into USD according to the exchange rate.
If the exchange rate has certain change, then the suppliers will
request to adjust the price by USD, so it is also a main factor to
the prices of castings.
Of course, if the change will be benefit to buyers, then the buyers
can request to adjust the prices too.
Tips: Require your suppliers to denote the
exchange rate in the quotation, it will be useful when the price
All these above factors will affect the final price of castings, so
unless the casting is extremely simple, otherwise, it will not be
easy to make a accurate price evaluation by buyers.
I think, as for buyer, you should denote or inform all necessary
requirements, and check if the suppliers have considered them during
On the website of Dandong Foundry, we update the gray iron, ductile
iron and cast steel prices timely according to the current