Types of Cast Iron Part-2

Types of Cast Iron:

4. Ductile Cast Iron:

 Ductile Cast Iron

It is a modified Grey Cast Iron. It is also called as nodular or spheroid graphite Cast iron or high strength forged iron.

Ductile forged iron is produced by adding anybody of the weather of magnesium, calcium, cerium, bismuth, zinc, cadmium, titanium, and boron into the molten Grey forged iron.

Composition of ductile Cast Iron is as follow:

i. Carbon – 3.2 to 4.5%.

ii. Silicon – 1 to 4%.

iii. Magnesium – 0.1% to 0.8%.

iv. Phosphorus – 0.1%.

v. Iron – the rest % is Iron.

5. Alloy Cast Iron:

 Alloy Cast Iron

Alloy Cast Irons are also called as plain Cast Irons. Alloyed forged iron s are produced by adding the alloying elements to the iron within the cupola furnace itself or adding an equivalent into the molten Cast Iron taken out of the furnace.

Better results are obtained when iron with alloying elements are heated in an electrical furnace or air furnace. The alloying elements used are; nickel, chromium, molybdenum, and vanadium. The usual alloying elements are Nickel and Chromium. Nickel is added to effect an increase in the hardness and resistance to wear. Chromium makes the forged iron extremely tough, strong and ductile.

Uses:

The alloy Cast Irons are used for gears, sprockets, wheels, I.C engine cylinders, piston, piston rings, crankcases, crankshafts, camshaft, brake drums and shoes, parts of grinding machines, etc.