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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Engineering Materials
Steel contains

80% or more iron
Elements like phosphorus, sulphur and silicon in varying quantities
Alloying elements like chromium, tungsten nickel and copper
50% or more iron

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