Engineering Materials
A reversible change in the atomic structure of steel with corresponding change in the properties is known as

Allotropic change
Molecular change
Solidus change
Physical change

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C below upper critical temperature
30° C to 50° C above lower critical temperature
30° C to 50° C below lower critical temperature
30° C to 50° C above upper critical temperature

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