Engineering Materials
Which of the following statements are true for annealing of steels?

Cooling is done slowly and steadily
Steels are heated to 500 to 700°C
Internal stresses are relieved
All of these

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Engineering Materials
Points of arrest for iron correspond to

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

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Engineering Materials
Grey cast iron

Is produced by annealing process. I is soft, tough and easily machined metal
Is also known as chilled cast iron 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 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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