Engineering Materials
Admiralty gun metal contains

Iron scrap and zinc
88% copper, 10% tin and rest zinc
Alloy of tin, lead and cadmium
63 to 67% nickel and 30% copper

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Engineering Materials
Cyaniding is the process of

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

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