Question

Which of the following materials is mostly used as a die material in gravity die casting?

(a) Grey cast iron

(b) Lead

(c) Magnesium

(d) Aluminium

The question was asked in a national level competition.

The origin of the question is Gravity Die Casting topic in chapter Special Casting Techniques of Casting-Forming-Welding I

Answer 1

Correct option is (a) Grey cast iron

The explanation is: In gravity die casting, fine-grained grey cast iron is the most generally used die material. Sometimes alloy cast iron, alloy steels (H11 and H14) and C20 steel are also used as die material for very large volumes and large parts. For small volume production of aluminium and magnesium, mould made of graphite is preferred.