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
Cyaniding is the process of

Obtaining cyanide salts
Adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
Reacting steel surface with cyanide salts
Dipping steel in cyanide bath

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