Engineering Materials
Points of arrest for iron correspond to

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

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Engineering Materials
Grey cast iron

Is also known as chilled cast iron is obtained by cooling rapidly. It is almost unmachinable
Is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroidal form and is well dispersed throughout the material
Is produced by annealing process. I is soft, tough and easily machined metal
Contains 1.7 to 3.5% carbon in Free State and is obtained by the slow cooling of molten cast iron

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Engineering Materials
Cyaniding is the process of

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

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