Pig Iron

Pig iron is produced from the first smelting of iron ore. The melt of the blast furnace is run off into rectangular moulds, traditionally in a branching structure running off a central runner with the moulds at right angles to each other. This configuration is similar to piglets suckling on a sow, hence the ingots are referred to as pigs.

Pig iron is either sand-cast or machine-cast. When it is sand-cast, it has sand adhering and fused into the surface giving more slag in the melting. Machine-cast pig iron is cast in steel forms and has a fine-grained chilled structure, with a lower melting point.

PROPERTIES OF PIG IRON

Pig iron has a high carbon content, typically 3.5% - 4.5% along with small percentages of silicon, sulphur, manganese and phosphorous. This makes it brittle and only really useful for resmelting to make cast iron, wrought iron or, nowadays, steel.

USES OF PIG IRON

Pig iron can also be used to produce gray iron and high purity pig irons can be used to produce ductile iron.

In modern steelmaking, pig iron/slag is transferred, in liquid form referred to as "hot metal", from the bottom of the blast furnace into a steel-making vessel, typically with an electric arc furnace, induction furnace or basic oxygen furnace by burning off the excess carbon and adjusting the alloy composition.

We offer hermatite/foundry grade pig iron and basic/steel making grade pig iron.