Engineering Materials
Bell metal contains

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

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Engineering Materials
Free carbon in iron makes the metal

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

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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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