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  1. Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
  2. Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
  3. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
  4. Heated below or closes to the lower critical temperature and then cooled slowly
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Answer: Option 2

In a hardening process, the hypo-eutectoid steel is Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

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