Engineering Materials
Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Soft and gives a coarse grained crystalline structure
Soft and gives a fine grained crystalline structure

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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
Heated up to the lower critical temperature and then cooled in still air
Heated below the lower critical temperature and then cooled slowly
None of these

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