Engineering Materials
In the lower part of the blast furnace (zone of fusion), the temperature is

800°C to 1000°C
1500°C to 1700°C
400° to 700°C
1200°C to 1300°C

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Engineering Materials
Carbon steel is

An alloy of iron and carbon with varying quantities of phosphorus and sulphur
Made by adding carbon in steel
Extensively used for making cutting tools
Refined from cast iron

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Engineering Materials
Combined carbon in iron makes the metal

Soft and gives a fine grained crystalline structure
Soft and gives coarse grained crystalline structure
Hard and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure

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Engineering Materials
Malleable cast iron

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron
Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
Is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
Is produced by annealing process. It is soft, tough, and easily machined metal

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