Engineering Materials
Sulphur in cast iron

Makes the iron soft and easily machinable
Aids fusibility and fluidity
Make the iron white and hard
Increases hardness and brittleness

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Engineering Materials
Cyaniding is the process of

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

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