26th November 2019

indiatimes
17

Why do they call it pig iron?

The name 'pig iron' originated in the early days of iron-ore reduction when the total output of the blast furnace was sand cast into 'pigs' —a mass of iron roughly resembling the shape of a reclining pig.

Beside this, why was cast iron invented?

Cast iron was invented in China in the 5th century BC and poured into moulds to make ploughshares and pots as well as weapons and pagodas. Although steel was more desirable, cast iron was cheaper and thus was more commonly used for implements in ancient China, while wrought iron or steel was used for weapons.

What is the use of cast iron?

It is used to make pots and pans and all sort of utensils that are used for heating purposes. This is because the cast iron surface distributes the heat from the stone evenly all over its surface. It can also be used for baking purposes. It is even used to make stoves from a single piece of mould.

Why cast iron is very brittle?

The internal carbon particles create internal stress points conducive to fracture. Cast iron is harder, more brittle, and less malleable than wrought iron. It cannot be bent, stretched, or hammered into shape, since its weak tensile strength means that it will fracture before it bends or distorts.
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