Engineering Materials
Bell metal contains

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

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Engineering Materials
Grey cast iron

Is produced by annealing process. I 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 o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable

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Engineering Materials
Specify the sequence correctly

Stress relief, recrystallization, grain growth
Grain growth, recrystallization, stress relief
Grain growth, stress relief, recrystallization
Stress relief, grain growth, recrystallization

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