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

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

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Engineering Materials
Grey cast iron

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
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

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