Engineering Materials
Brass 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
Steel contains

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

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