Engineering Materials
Gun metal contains

70% copper and 30% zinc
70 - 78% copper and rest tin
90% copper and 10% tin
85 - 92% copper and rest tin with little lead and nickel

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Engineering Materials
Steel contains

Alloying elements like chromium, tungsten nickel and copper
50% or more iron
80% or more iron
Elements like phosphorus, sulphur and silicon in varying quantities

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Engineering Materials
Specify the sequence correctly

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

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