Engineering Materials
Cyaniding is the process of

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

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Engineering Materials
Carbon steel is

Made by adding carbon in steel
Refined from cast iron
Extensively used for making cutting tools
An alloy of iron and carbon with varying quantities of phosphorus and sulphur

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