Engineering Materials
Steel contains

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

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Engineering Materials
In spheroidising process, the steel is

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
Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C

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