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

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

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Engineering Materials
In spheroidising process, the steel is

Heated below the lower critical temperature and then cooled slowly
Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
None of these
Heated up to the lower critical temperature and then cooled in still air

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