How is ‘cast iron’ different from ‘pig iron”?

Explanation

the iron obtained from blast furace is called pig iron , it contaiond about 4 % carbon and many other impuriites in amaller amount (eg.s ,p,Si and Mn ) Cast iron is made by melting pig iron wit scraap iron and coke using hot air it has silghtly lower carbon content (about 3 %) and is extremely hard and brittle .