Engineering Materials
The main alloying elements high speed steel in order of increasing proportion are

Vanadium, chromium, tungsten
Tungsten, titanium, vanadium
Chromium, titanium, vanadium
Tungsten, chromium, titanium

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Engineering Materials
Points of arrest for iron correspond to

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

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