Engineering Materials
Brass contains

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

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Engineering Materials
Steel contains

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

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