In spheroidising process, the steel is
A
Heated below the lower critical temperature and then cooled slowly
B
Heated up to the lower critical temperature and then cooled in still air
C
Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
D
None of the above
Correct Answer: Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Spheroidizing of high carbon steel is a method of prolonged heating at a temperature below the eutectoid temperature.By heating at this temperature pearlite, which is the lowest energy arrangement of steel, gets converted to ferrite and cementite. .
However, the process of spheroidizing does consume a lot of energy.
