In a hardening process, the hypo-eutectoid steel is

A. Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air

B. Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

C. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

D. Heated below or closes to the lower critical temperature and then cooled slowly

Answer: Option B

Solution(By Examveda Team)

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