Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points of discontinuity
Constant for all metals
The points where there is no further flow of metal
The points where no further change occurs

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Engineering Materials
Steel contains

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

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