ENGINEERING MATERIALS

In still air

Slowly in the furnace

Any one of these

Suddenly in a suitable cooling medium

Hard

Hard and tough

Soft

Tough

Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

Is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Is produced by annealing process. It is soft, tough and easily machined metal

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Open hearth process

LD process

Bessemer process

Electric process

Flame hardening

Any one of these

Nitriding

Case hardening