what is the major diffrence btw cast iron and pig iron?

iron obtained from cooling of pig iron is called cast iron....hope it will help you

Cast iron is  a solid form but pig iron is a liquid form

Cast iron :

i.it contains low percentage of carbon and other impurities

ii.it is malleable and ductile

Pig iron:

i.it contains more percentage of carbon and other impurities like S,P,Si

ii.it is brittle

Pig iron is cast iron with a very high carbon content: 4% by weight or more. Cast iron has at least 2% carbon by weight. Less than that, and it''s steel. Cast iron and pig iron are not called steel, despite being iron carbides, because they lack the structural strength of steel and are extremely brittle. In terms of the microstructure, cast iron and pig iron contain no cementite, austenite, or martensite.

the main differnce betwen cast iron and pig iron that is pig iron is presnt in molten form after we get cast iron which contain 4% carbon impurity

Carbon (C) and silicon (Si) are the main alloying elements, with the amount ... Cast iron is made by re-melting pig iron, often along with substantial ... improves toughness, and evens out hardness differences between section thicknesses.

Pig iron is cast iron with a very high carbon content: 4% by weight or more. Cast iron has at least 2% carbon by weight. Less than that, and it''''s steel. Cast iron and pig iron are not called steel, despite being iron carbides, because they lack the structural strength of steel and are extremely brittle. In terms of the microstructure, cast iron and pig iron contain no cementite, austenite, or martensite.