Engineering Materials
When low carbon steel is heated up to upper critical temperature

The average grain size is a minimum
The grain size first increases and then decreases very rapidly
The grain size increases very rapidly
There is no change in grain size

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Engineering Materials
Ductile cast iron

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

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