Engineering Materials
Cyaniding is the process of

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

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C above lower critical temperature
30° C to 50° C below lower critical temperature
30° C to 50° C below upper critical temperature
30° C to 50° C above upper critical temperature

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Engineering Materials
Aluminium bronze contains

10% aluminium and 90% copper
94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
92.5% aluminium, 4% copper, 2% nickel, and 1.5% Mg
90% magnesium and 9% aluminium with some copper

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