• Cast iron is derived from pig iron, which is a by-product of smelting iron in a foundry. The properties of cast iron are different than the properties of carbon steel and ductile iron; the main characteristic of cast iron is that it is somewhat fragile - generally cast iron will be used for kitchen pans and other implements that are not likely to endure a lot of rough use that might snap the metal.
• Carbon Steel, on the other hand, is not fragile at all. This alloy is made when steel is mixed with carbon during the alloying process. Sometimes, strong, tough carbon steel may also be coated with case hardeners that give it a durable coating. Carbon steel is often used for car parts and other mechanical components, since its strength and durability are excellent.
Also known as nodular iron, ductile iron offers superior hardness and durability when compared to brittle cast iron. Although cast iron and durable iron are in the same general family, they are not used in the same way. Made of an alloy created from silicon, carbon, and iron, this metal was invented to improve upon the basic properties of cast iron, which is more fragile than ductile iron. Ductile iron also has a quicker firing process - it doesn't require a long and drawn-out heating process. Ductile iron is commonly used for iron pipe.
Different types of metal are used for different reasons, and two or three types of iron and steel may be needed to create a large machine or structure. Since scientists and engineers understand the properties of metal, they know how to use the right material for their needs.