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Full annealing practice for hypo-eutectoid steel In full annealing of a hypo-eutectoid steel, the steel is heated to 30–50°C above the upper critical temperature and then cooled how? Choose the correct option.

Difficulty: Easy

In still air (air cooling)
Slowly in the furnace (furnace cooling)
Suddenly in a quench medium
Any one of these

Correct Answer: Slowly in the furnace (furnace cooling)

Explanation:

Concept
Full annealing of hypo-eutectoid steels: heat to about 30–50°C above A₃ to form homogeneous austenite and cool slowly in the furnace. This promotes full transformation to coarse pearlite/ferrite and produces maximum softness and ductility.

Final Answer
Slowly in the furnace (furnace cooling)

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