Engineering Materials
White cast iron

Is produced by annealing process. It is soft, tough and easily machined metal
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 also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

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Engineering Materials
Chromium in steel

Improves wear resistance, cutting ability and toughness
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Gives ductility, toughness, tensile strength and anti-corrosion properties
Improves cutting ability and reduces hardenability

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Engineering Materials
Thermoplastic materials are those materials which

Are used as a friction lining for clutches and brakes
Do not become hard with the application of heat and pressure and no chemical change occurs
Are formed into shape under heat and pressure and results in a permanently hard product
Are flexible and can withstand considerable wear under suitable conditions

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