Engineering Materials
The lower critical temperature

Decreases as the carbon content in steel increases
Is same for all steels
Increases as the carbon content in steel increases
Depends upon the rate of heating

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Engineering Materials
White cast iron

Is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
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
Is produced by annealing process. It 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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