Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?
Correct answer: C. Annealing
- A. Tempering
- B. Hardening
- C. Annealing
- D. Normalising
Explanation
Heating hypoeutectoid steel above its upper critical temperature, soaking it, and cooling it slowly produces ferrite and pearlite, which is full annealing. Normalising also begins above the critical temperature but uses air cooling, not slow furnace cooling.
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