Engineering Materials
Brass contains

90% copper and 10% tin
70 - 75% copper and rest tin
85 - 92% copper and rest tin with little lead and nickel
70% copper and 30% zinc

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Engineering Materials
Thermoplastic materials are those materials which

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
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

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Engineering Materials
In process annealing, the hypo eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated below or closes to the lower critical temperature and then cooled slowly

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