Engineering Materials
The lower critical temperature

Depends upon the rate of heating
Increases as the carbon content in steel increases
Is same for all steels
Decreases as the carbon content in steel increases

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Engineering Materials
In spheroidising process, the steel is

Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
None of these
Heated up to the lower critical temperature and then cooled in still air
Heated below the lower critical temperature and then cooled slowly

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