Refer to the “Iron-iron carbide equilibrium diagram” below,

Refer to the “Iron-iron carbide equilibrium diagram” below, there is a plain carbon steel A with 0.6%C, which has been annealed to a temperature just below 723°C. 

a. Determine the percentage of ferrite and cementite of carbon steel A at the (a) (6 marks) temperature just below 723°C. 

b.  If the weight of plain carbon steel A is 10 kg, calculate the weight of ferrite and cementite at room temperature.

c. Besides ferrite and cementite, what material structure can be found at the (c) (2 marks) temperature just below 723°C. 

d. Give FIVE reasons for case hardening. 

e. With the aid of diagram, name and describe the process of producing a PP bottle.

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