Engineering Materials
Cyaniding is the process of

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
Obtaining cyanide salts

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Engineering Materials
Free carbon in iron makes the metal

Soft and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Hard and gives a fine grained crystalline structure
Soft and gives a coarse grained crystalline structure

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