Pig iron is the primary product obtained from the blast furnace.

It is the basic raw material used for producing cast iron and steel.

Definition

Pig Iron

Pig iron is the crude iron obtained directly from the blast furnace containing high carbon and impurities.

Composition of Pig Iron

Typical composition:

Characteristics of Pig Iron

Pig iron has the following properties:

• Hard and brittle

• High carbon content

• Low ductility

• Cannot be used directly for engineering applications

Types of Pig Iron

Pig iron is classified into:

1. Grey Pig Iron

• Contains higher silicon

• Grey fracture surface

2. White Pig Iron

• Low silicon content

• White crystalline fracture

• Hard and brittle

Uses of Pig Iron

Pig iron is mainly used for producing:

• Cast iron

• Steel

• Wrought iron

• Foundry products

Exam-Focused Points

Important facts for JE/AE exams:

• Pig iron is first product of blast furnace

• Contains 3–4.5% carbon

• Raw material for steel and cast iron

Quick Revision Summary

Iron Ores

• Main ores → Hematite, Magnetite, Limonite, Siderite

• Magnetite → Highest iron content

• Hematite → Most widely used

Blast Furnace

• Raw materials → Iron ore, Coke, Limestone

• Coke → Fuel and reducing agent

• Limestone → Flux

• Produces → Molten iron + slag

Pig Iron

• Crude iron from blast furnace

• High carbon content

• Used to manufacture cast iron and steel