what is the differnce between cast iron and ductile iron?

Question

it is related to foundary!
or if anyone could help me by letting me a good source online.

Answer 1

Main deference is in Carbon content.

Look up. Ryerson steel supply .com

Look up. Central stee supply .com

If you know the local suppliers then go to their sites and call them.

Foundry use them and they may make them also. A good metallurgical book Will be a great help also.

Both Irons have lot of different products.

Ductile has less carbon and it will be a steel product.

Answer 2

CAST IRON IS THE IRON WE GET DIRECTLY OUT OF THE BLAST FURNACE. IT CONTAINS TRACES OF CARBON, MANGANESE,MAGNESIUM,PHOSPHOROUS AND OTHER METALS. IT IS HARD AND BRITTLE. CAST IRON IS CONVERTED TO DUCTILE IRON OR WROUGHT IRON BY HEATING CAST IRON IN A FURNACE WITH COKE LINED WITH HAEMATITE(Fe2O3).IT IS DUCTILE.

Answer 3

cast iron or pig iron contains 2 to 5% of carbon...
wrought iron & steel are ductile iron....
wrought iron contains 0.1% to 0.25% of carbon...
steel contains 0.25 to 2% of carbon....

Answer 4

Cast iron
From Wikipedia, the free encyclopedia
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For the cookware, see Cast iron cookware.
Iron alloy phases
Austenite (γ-iron; hard)
Bainite
Martensite
Cementite (iron carbide; Fe3C)
Ferrite (α-iron; soft)
Pearlite (88% ferrite, 12% cementite)


Types of Steel
Plain-carbon steel (up to 2.1% carbon)
Stainless steel (alloy with chromium)
HSLA steel (high strength low alloy)
Tool steel (very hard; heat-treated)


Other Iron-based materials
Cast iron (>2.1% carbon)
Wrought iron (almost no carbon)
Ductile iron


Cast iron usually refers to grey cast iron, but can mean any of a group of iron-based alloys containing more than 2% carbon (alloys with less carbon are carbon steel by definition). It is made by remelting pig iron, often along with substantial quantities of scrap iron and scrap steel, and taking various steps to remove undesirable contaminants such as phosphorus and sulfur. Carbon and silicon content are reduced to the desired levels, which may be anywhere from 2% to 3.5% for carbon and 1% to 3% for silicon depending on the application. Other elements are then added to the melt before the final form is produced by casting


(almost no carbon)
Ductile iron


Ductile iron, also called nodular cast iron, is one type of cast iron. It was invented in 1942 by Keith Millis[1].

A typical chemical analysis of this material is:

Carbon 3.3 to 3.8%
Silicon 2.2 to 2.8%
Manganese 0.1 to 0.5%
Sulfur 0.005 to 0.02%
Phosphorus 0.005 to 0.04%
Magnesium 0.03 to 0.05%
balance (i.e., 100% minus the above elements) is the element Iron.
Other elements such as copper, tin may be added intentionally to increase tensile and yield strength while simultaneously reducing elongation.

The unique characteristic of ductile iron is that the graphite forms into a spherical shape, instead of irregular flakes. Sometimes this is referred to as a "nodular" shape. Ductile iron may also be called "nodular iron". This can be achieved by addition of "nodulizers" into the melt. Yttrium was studied as one of the options.

Castings made of ductile iron are used in numerous applications. Examples are in automobile construction, industrial machinery, wind turbine electrical energy generation, valves, air conditioning machinery, lawn & garden equipment, agricultural products and many other types of castings.

For corrosion resistant applications 15% to 30% of the Iron in the alloy may be replaced with varying amounts of Nickel and/or Copper and/or Chromium.

A recent development in ductile iron metallurgy is Austempered Ductile Iron where the metallurgical structure is manipulated through a sophisticated heat treat process.

A large percentage of the annual tonnage of ductile iron produced is used in water and sewer lines. This is called cast ductile iron pipe. Ductile iron pipe is stronger, easier to tap, requires less support and provides greater flow area compared to other materials. In difficult terrain it may be a better choice than PVC, concrete, polyethylene or steel pipe.