Engineering Materials
Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature
Stages at which further heating does not increase temperature for some time
There is nothing like points of arrest
Stages at which allotropic forms change

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Engineering Materials
Cyaniding is the process of

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

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