Question

Which variety of cast iron is obtained by melting cast iron with wrought iron scrap?

(a) Mottled cast iron

(b) Chilled cast iron

(c) Malleable cast iron

(d) Toughened cast iron

I have been asked this question in final exam.

I'm obligated to ask this question of Ferrous Metals in division Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

Answer 1

Right answer is (d) Toughened cast iron

For explanation: Melting cast iron with wrought iron scrap results in the formation of toughened cast iron. Mottled cast iron is an intermediate between white cast iron and grey cast iron.