Engineering Materials
The silicon steel is widely used for

Generators and transformers in the form of laminated cores
Cutting tools
Connecting rods
Motor car crankshafts

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Engineering Materials
Points of arrest for iron correspond to

Stages at which properties do not change with increase in temperature
Stages at which allotropic forms change
There is nothing like points of arrest
Stages at which further heating does not increase temperature for some time

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

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

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