Engineering Materials
Chilled cast iron has

A very high percentage of graphite
A low percentage of graphite
Graphite as its basic constituent of composition
No graphite

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C above upper critical temperature
30° C to 50° C above lower critical temperature
30° C to 50° C below upper critical temperature
30° C to 50° C below lower critical temperature

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Engineering Materials
In a hardening process, the hypo-eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated below or closes to the lower critical temperature and then cooled slowly

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